From 616ab317c17cdbf6b333b30ef4d14d547ada65dd Mon Sep 17 00:00:00 2001
From: chu23465 <130033130+chu23465@users.noreply.github.com>
Date: Mon, 14 Apr 2025 08:39:57 +0530
Subject: [PATCH] Integrate subby

---
 scripts/subby/.gitignore                      | 135 ++++
 scripts/subby/.pylintrc                       |   2 +
 scripts/subby/LICENSE                         | 674 ++++++++++++++++++
 scripts/subby/README.md                       | 137 ++++
 scripts/subby/poetry.lock                     | 551 ++++++++++++++
 scripts/subby/pyproject.toml                  |  33 +
 scripts/subby/setup.py                        |   4 +
 scripts/subby/subby/__init__.py               |  25 +
 scripts/subby/subby/cli.py                    | 217 ++++++
 scripts/subby/subby/converters/__init__.py    |   0
 scripts/subby/subby/converters/base.py        |  27 +
 .../subby/subby/converters/bilibili_json.py   |  27 +
 scripts/subby/subby/converters/mp4.py         | 111 +++
 scripts/subby/subby/converters/sami.py        |  90 +++
 scripts/subby/subby/converters/smpte.py       | 168 +++++
 scripts/subby/subby/converters/webvtt.py      | 162 +++++
 scripts/subby/subby/processors/__init__.py    |   0
 scripts/subby/subby/processors/base.py        |  30 +
 .../subby/subby/processors/common_issues.py   | 278 ++++++++
 scripts/subby/subby/processors/rtl.py         |  34 +
 scripts/subby/subby/processors/sdh.py         | 109 +++
 scripts/subby/subby/regex.py                  |  22 +
 scripts/subby/subby/subripfile.py             |  38 +
 scripts/subby/subby/utils/time.py             |  44 ++
 24 files changed, 2918 insertions(+)
 create mode 100644 scripts/subby/.gitignore
 create mode 100644 scripts/subby/.pylintrc
 create mode 100644 scripts/subby/LICENSE
 create mode 100644 scripts/subby/README.md
 create mode 100644 scripts/subby/poetry.lock
 create mode 100644 scripts/subby/pyproject.toml
 create mode 100644 scripts/subby/setup.py
 create mode 100644 scripts/subby/subby/__init__.py
 create mode 100644 scripts/subby/subby/cli.py
 create mode 100644 scripts/subby/subby/converters/__init__.py
 create mode 100644 scripts/subby/subby/converters/base.py
 create mode 100644 scripts/subby/subby/converters/bilibili_json.py
 create mode 100644 scripts/subby/subby/converters/mp4.py
 create mode 100644 scripts/subby/subby/converters/sami.py
 create mode 100644 scripts/subby/subby/converters/smpte.py
 create mode 100644 scripts/subby/subby/converters/webvtt.py
 create mode 100644 scripts/subby/subby/processors/__init__.py
 create mode 100644 scripts/subby/subby/processors/base.py
 create mode 100644 scripts/subby/subby/processors/common_issues.py
 create mode 100644 scripts/subby/subby/processors/rtl.py
 create mode 100644 scripts/subby/subby/processors/sdh.py
 create mode 100644 scripts/subby/subby/regex.py
 create mode 100644 scripts/subby/subby/subripfile.py
 create mode 100644 scripts/subby/subby/utils/time.py

diff --git a/scripts/subby/.gitignore b/scripts/subby/.gitignore
new file mode 100644
index 0000000..dec16f1
--- /dev/null
+++ b/scripts/subby/.gitignore
@@ -0,0 +1,135 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+stubs/
+mypy.ini
+
+# Pyre type checker
+.pyre/
+
+# Ruff
+.ruff_cache/
+.ruff.toml
diff --git a/scripts/subby/.pylintrc b/scripts/subby/.pylintrc
new file mode 100644
index 0000000..7615b86
--- /dev/null
+++ b/scripts/subby/.pylintrc
@@ -0,0 +1,2 @@
+[FORMAT]
+max-line-length=120
diff --git a/scripts/subby/LICENSE b/scripts/subby/LICENSE
new file mode 100644
index 0000000..f288702
--- /dev/null
+++ b/scripts/subby/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
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+ Everyone is permitted to copy and distribute verbatim copies
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+
+  Nothing in this License shall be construed as excluding or limiting
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+
+  12. No Surrender of Others' Freedom.
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+  Later license versions may give you additional or different
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+  17. Interpretation of Sections 15 and 16.
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+  If the disclaimer of warranty and limitation of liability provided
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+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
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+                     END OF TERMS AND CONDITIONS
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+            How to Apply These Terms to Your New Programs
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+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
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+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
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+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
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+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
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+Also add information on how to contact you by electronic and paper mail.
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+  If the program does terminal interaction, make it output a short
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+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
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+if any, to sign a "copyright disclaimer" for the program, if necessary.
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+  The GNU General Public License does not permit incorporating your program
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+may consider it more useful to permit linking proprietary applications with
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diff --git a/scripts/subby/README.md b/scripts/subby/README.md
new file mode 100644
index 0000000..1bb6fcb
--- /dev/null
+++ b/scripts/subby/README.md
@@ -0,0 +1,137 @@
+# Subby
+Advanced subtitle converter and processor.
+
+# Supported formats
+WebVTT, DFXP/TTML/TTML2/SMPTE, SAMI, WVTT (WebVTT in MP4), STPP/ISMT (DFXP in MP4), JSON (Bilibili)
+
+# Functionality
+- converts supported input format to SRT
+- retains select formatting tags (italics, basic \an8 positioning)
+- corrects often found flaws in subtitles
+- opinionated timing and formatting improvements
+
+# Installation
+```
+git clone https://github.com/vevv/subby
+cd subby
+pip install .
+```
+
+# Usage notes
+`CommonIssuesFixer` should be ran both after conversion and SDH stripping
+as it's designed to fix source issues, including ones which can cause playback problems.
+
+`CommonIssuesFixer` removes short gaps (2 frames) by default.
+This can be disabled by setting `CommonIssuesFixer.remove_gaps` to `False` before running.
+
+`subby.SubRipFile` accepts similar methods to `pysrt.SubRipFile`, but isn't a fully compatible replacement.
+Only `from_string`, `clean_indexes`, `export`, `save` are guaranteed to work.
+
+This object is otherwise just a list storing `srt.Subtitle` elements.
+
+## Language specific fixing
+
+As of 0.3.6, both `CommonIssuesFixer` and `SDHStripper` support a language parameter,
+which accepts a BCP47 language code.
+
+This is currently used only for RTL tagging in CommonIssuesFixer.
+
+**It is highly recommended for every script to pass it for future use.**
+
+# Command line usage
+```
+Usage: subby [OPTIONS] COMMAND [ARGS]...
+
+  Subby—Advanced Subtitle Converter and Processor.
+
+Options:
+  -d, --debug  Enable DEBUG level logs.
+  --help       Show this message and exit.
+
+Commands:
+  convert  Convert a Subtitle to SubRip (SRT).
+  process  SubRip (SRT) post-processing.
+  version  Print version information.
+```
+Example
+
+```
+subby process /path/to/subs/subs.srt strip-sdh 
+```
+
+# Library usage
+## Converter
+```py
+from subby import WebVTTConverter
+from pathlib import Path
+
+converter = WebVTTConverter()
+file = Path('test.vtt')
+
+# All statements below are equivalent
+srt = converter.from_file(file)
+srt = converter.from_string(file.read_text())
+srt = converter.from_bytes(file.read_bytes())
+
+# srt is subby.SubRipFile
+
+output = Path('file.srt')
+srt.save(output)
+# saved to file.srt
+```
+
+## Processor
+Processor returns a bool indicating success - whether any changes were made, useful for determining if SDH subtitles should be saved.
+
+```py
+from subby import CommonIssuesFixer
+from pathlib import Path
+
+processor = CommonIssuesFixer()
+file = Path('test.vtt')
+
+# All statements below are equivalent
+srt, status = processor.from_file(file)
+srt, status = processor.from_string(file.read_text())
+srt, status = processor.from_bytes(file.read_bytes())
+
+# srt is subby.SubRipFile, status is bool
+
+output = Path('test_fixed.srt')
+srt.save(output)
+# saved to test_fixed.srt
+```
+
+## Chaining
+The following example will convert a VTT file, attempt to strip SDH, and then save the result.
+
+```py
+from subby import WebVTTConverter, CommonIssuesFixer, SDHStripper
+from pathlib import Path
+
+converter = WebVTTConverter()
+fixer = CommonIssuesFixer()
+stripper = SDHStripper()
+
+file = Path('file.vtt')
+file_sdh = Path('file_sdh.srt')
+file_stripped = Path('file_stripped.srt')
+srt, _ = fixer.from_srt(converter.from_file(file))
+
+srt.save(file_sdh)
+# saved to file_sdh.srt
+
+stripped, status = stripper.from_srt(srt)
+if status is True:
+    print('stripping successful')
+    stripped.save(file_stripped)
+    # saved to file_stripped.srt
+```
+
+## Tests
+To run tests, go to the "tests" directory and run `pytest`.
+
+## Contributors
+
+<a href="https://github.com/vevv"><img src="https://images.weserv.nl/?url=avatars.githubusercontent.com/u/68520787?v=4&h=25&w=25&fit=cover&mask=circle&maxage=7d" alt=""/></a>
+<a href="https://github.com/rlaphoenix"><img src="https://images.weserv.nl/?url=avatars.githubusercontent.com/u/17136956?v=4&h=25&w=25&fit=cover&mask=circle&maxage=7d" alt=""/></a>
diff --git a/scripts/subby/poetry.lock b/scripts/subby/poetry.lock
new file mode 100644
index 0000000..241fc18
--- /dev/null
+++ b/scripts/subby/poetry.lock
@@ -0,0 +1,551 @@
+# This file is automatically @generated by Poetry 1.8.5 and should not be changed by hand.
+
+[[package]]
+name = "beautifulsoup4"
+version = "4.13.3"
+description = "Screen-scraping library"
+optional = false
+python-versions = ">=3.7.0"
+files = [
+    {file = "beautifulsoup4-4.13.3-py3-none-any.whl", hash = "sha256:99045d7d3f08f91f0d656bc9b7efbae189426cd913d830294a15eefa0ea4df16"},
+    {file = "beautifulsoup4-4.13.3.tar.gz", hash = "sha256:1bd32405dacc920b42b83ba01644747ed77456a65760e285fbc47633ceddaf8b"},
+]
+
+[package.dependencies]
+soupsieve = ">1.2"
+typing-extensions = ">=4.0.0"
+
+[package.extras]
+cchardet = ["cchardet"]
+chardet = ["chardet"]
+charset-normalizer = ["charset-normalizer"]
+html5lib = ["html5lib"]
+lxml = ["lxml"]
+
+[[package]]
+name = "click"
+version = "8.1.8"
+description = "Composable command line interface toolkit"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "click-8.1.8-py3-none-any.whl", hash = "sha256:63c132bbbed01578a06712a2d1f497bb62d9c1c0d329b7903a866228027263b2"},
+    {file = "click-8.1.8.tar.gz", hash = "sha256:ed53c9d8990d83c2a27deae68e4ee337473f6330c040a31d4225c9574d16096a"},
+]
+
+[package.dependencies]
+colorama = {version = "*", markers = "platform_system == \"Windows\""}
+
+[[package]]
+name = "colorama"
+version = "0.4.6"
+description = "Cross-platform colored terminal text."
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
+files = [
+    {file = "colorama-0.4.6-py2.py3-none-any.whl", hash = "sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6"},
+    {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
+]
+
+[[package]]
+name = "construct"
+version = "2.8.8"
+description = "A powerful declarative parser/builder for binary data"
+optional = false
+python-versions = "*"
+files = [
+    {file = "construct-2.8.8.tar.gz", hash = "sha256:1b84b8147f6fd15bcf64b737c3e8ac5100811ad80c830cb4b2545140511c4157"},
+]
+
+[[package]]
+name = "exceptiongroup"
+version = "1.2.2"
+description = "Backport of PEP 654 (exception groups)"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "exceptiongroup-1.2.2-py3-none-any.whl", hash = "sha256:3111b9d131c238bec2f8f516e123e14ba243563fb135d3fe885990585aa7795b"},
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+]
+
+[package.extras]
+test = ["pytest (>=6)"]
+
+[[package]]
+name = "iniconfig"
+version = "2.0.0"
+description = "brain-dead simple config-ini parsing"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "iniconfig-2.0.0-py3-none-any.whl", hash = "sha256:b6a85871a79d2e3b22d2d1b94ac2824226a63c6b741c88f7ae975f18b6778374"},
+    {file = "iniconfig-2.0.0.tar.gz", hash = "sha256:2d91e135bf72d31a410b17c16da610a82cb55f6b0477d1a902134b24a455b8b3"},
+]
+
+[[package]]
+name = "langcodes"
+version = "3.4.1"
+description = "Tools for labeling human languages with IETF language tags"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "langcodes-3.4.1-py3-none-any.whl", hash = "sha256:68f686fc3d358f222674ecf697ddcee3ace3c2fe325083ecad2543fd28a20e77"},
+    {file = "langcodes-3.4.1.tar.gz", hash = "sha256:a24879fed238013ac3af2424b9d1124e38b4a38b2044fd297c8ff38e5912e718"},
+]
+
+[package.dependencies]
+language-data = ">=1.2"
+
+[package.extras]
+build = ["build", "twine"]
+test = ["pytest", "pytest-cov"]
+
+[[package]]
+name = "language-data"
+version = "1.3.0"
+description = "Supplementary data about languages used by the langcodes module"
+optional = false
+python-versions = "*"
+files = [
+    {file = "language_data-1.3.0-py3-none-any.whl", hash = "sha256:e2ee943551b5ae5f89cd0e801d1fc3835bb0ef5b7e9c3a4e8e17b2b214548fbf"},
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+]
+
+[package.dependencies]
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+
+[package.extras]
+build = ["build", "twine"]
+test = ["pytest", "pytest-cov"]
+
+[[package]]
+name = "lxml"
+version = "5.3.1"
+description = "Powerful and Pythonic XML processing library combining libxml2/libxslt with the ElementTree API."
+optional = false
+python-versions = ">=3.6"
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diff --git a/scripts/subby/pyproject.toml b/scripts/subby/pyproject.toml
new file mode 100644
index 0000000..28db507
--- /dev/null
+++ b/scripts/subby/pyproject.toml
@@ -0,0 +1,33 @@
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+tinycss = "^0.4"
+click = "^8.1.3"
+srt = "^3.5.3"
+lxml = "^5.3.0"
+langcodes = "^3.4.0"
+
+[tool.poetry.group.dev]
+optional = true
+
+[tool.poetry.group.dev.dependencies]
+pytest = "^7.4.3"
+lxml-stubs = "^0.4.0"
+
+
+[tool.poetry.scripts]
+subby = "subby.cli:main"
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"
diff --git a/scripts/subby/setup.py b/scripts/subby/setup.py
new file mode 100644
index 0000000..1abbd06
--- /dev/null
+++ b/scripts/subby/setup.py
@@ -0,0 +1,4 @@
+import setuptools
+
+if __name__ == "__main__":
+    setuptools.setup()
diff --git a/scripts/subby/subby/__init__.py b/scripts/subby/subby/__init__.py
new file mode 100644
index 0000000..df019f9
--- /dev/null
+++ b/scripts/subby/subby/__init__.py
@@ -0,0 +1,25 @@
+from subby.converters.bilibili_json import BilibiliJSONConverter
+from subby.converters.mp4 import ISMTConverter, WVTTConverter
+from subby.converters.sami import SAMIConverter
+from subby.converters.smpte import SMPTEConverter
+from subby.converters.webvtt import WebVTTConverter
+from subby.processors.common_issues import CommonIssuesFixer
+from subby.processors.sdh import SDHStripper
+from subby.subripfile import SubRipFile
+
+__version__ = '0.3.19'
+
+__all__ = [
+    # Converters
+    'SAMIConverter',
+    'SMPTEConverter', 'ISMTConverter',
+    'WebVTTConverter', 'WVTTConverter',
+    'BilibiliJSONConverter',
+    # Processors
+    'CommonIssuesFixer',
+    'SDHStripper',
+    # Utility
+    'SubRipFile',
+    # Version
+    '__version__'
+]
diff --git a/scripts/subby/subby/cli.py b/scripts/subby/subby/cli.py
new file mode 100644
index 0000000..b70de80
--- /dev/null
+++ b/scripts/subby/subby/cli.py
@@ -0,0 +1,217 @@
+from __future__ import annotations
+
+import logging
+from datetime import datetime
+from pathlib import Path
+
+import click
+
+from subby import (BilibiliJSONConverter, CommonIssuesFixer, ISMTConverter,
+                   SAMIConverter, SDHStripper, SMPTEConverter, WebVTTConverter,
+                   WVTTConverter, __version__)
+
+
+@click.group()
+@click.option("-d", "--debug", is_flag=True, default=False, help="Enable debug level logs.")
+def main(debug: bool) -> None:
+    """Subby—Advanced Subtitle Converter and Processor."""
+    logging.basicConfig(level=logging.DEBUG if debug else logging.INFO)
+    logging.getLogger('srt').setLevel(logging.DEBUG if debug else logging.CRITICAL)
+
+
+@main.command()
+def version():
+    """Print version information."""
+    log = logging.getLogger(__name__)
+
+    copyright_years = 2023
+    current_year = datetime.now().year
+    if copyright_years != current_year:
+        copyright_years = f"{copyright_years}-{current_year}"
+
+    log.info("Subby version %s Copyright (c) %s vevv", __version__, copyright_years)
+    log.info("https://github.com/vevv/subby")
+
+
+@main.command()
+@click.argument("file", type=Path)
+@click.option("-o", "--out", type=Path, default=None, help="Output path.")
+@click.option(
+    "-l",
+    "--language",
+    type=str,
+    default=None,
+    help="Subtitle language (used for language specific processing)"
+)
+@click.option(
+    "-e",
+    "--encoding",
+    type=str,
+    default="utf-8",
+    help="Character encoding (default: utf-8)."
+)
+@click.option(
+    "-n",
+    "--no-post-processing",
+    is_flag=True,
+    default=False,
+    help="Disable post-processing after conversion."
+)
+@click.option(
+    "-g",
+    "--keep-short-gaps",
+    is_flag=True,
+    help="Keep short gaps between lines (< 85 ms; only with post-processing enabled)"
+)
+def convert(
+    file: Path,
+    out: Path | None,
+    language: str,
+    encoding: str,
+    no_post_processing: bool,
+    keep_short_gaps: bool
+):
+    """Convert a Subtitle to SubRip (SRT)."""
+    if not isinstance(file, Path):
+        raise click.ClickException(f"Expected file to be a {Path} not {file!r}")
+    if out and not isinstance(out, Path):
+        raise click.ClickException(f"Expected out to be a {Path} not {out!r}")
+
+    if not out:
+        out = file.with_suffix(".srt")
+
+    log = logging.getLogger("convert")
+
+    data = file.read_bytes()
+    converter = None
+
+    if b"mdat" in data and b"moof" in data:
+        if b"</tt>" in data:
+            log.info("Subtitle format: ISMT (DFXP in MP4)")
+            converter = ISMTConverter()
+        elif b"vttc" in data:
+            log.info("Subtitle format: WVTT (WebVTT in MP4)")
+            converter = WVTTConverter()
+    elif b"<SAMI>" in data:
+        log.info("Subtitle format: SAMI")
+        converter = SAMIConverter()
+    elif b"</tt>" in data or b"</tt:tt>" in data:
+        log.info("Subtitle format: DFXP/TTML/TTML2")
+        converter = SMPTEConverter()
+    elif b"WEBVTT" in data:
+        log.info("Subtitle format: WebVTT")
+        converter = WebVTTConverter()
+    elif data.startswith(b'{') and b'"Stroke"' in data and b'"background_color"' in data:
+        log.info("Subtitle format: JSON (Bilibili)")
+        converter = BilibiliJSONConverter()
+
+    if not converter:
+        log.error("Subtitle format was unrecognized...")
+        return
+
+    srt = converter.from_file(file)
+    log.info("Converted subtitle to SubRip (SRT)")
+
+    if not no_post_processing:
+        processor = CommonIssuesFixer()
+        processor.remove_gaps = not keep_short_gaps
+        srt, status = processor.from_srt(srt, language=language)
+        log.info(f"Processed subtitle {['but no issues were found...', 'and repaired some issues!'][status]}")
+
+    srt.save(out, encoding=encoding)
+    log.info(f"Saved to: {out}")
+    log.debug(f"Used character encoding {encoding}")
+
+
+@main.group()
+@click.argument("file", type=Path)
+@click.option("-o", "--out", type=Path, default=None, help="Output path.")
+@click.option(
+    "-l",
+    "--language",
+    type=str,
+    default=None,
+    help="Subtitle language (used for language specific processing)"
+)
+@click.option(
+    "-e",
+    "--encoding",
+    type=str,
+    default="utf-8",
+    help="Character encoding (default: utf-8)."
+)
+@click.option(
+    "-n",
+    "--no-post-processing",
+    is_flag=True,
+    default=False,
+    help="Disable post-processing after SDH stripping."
+)
+@click.option(
+    "-g",
+    "--keep-short-gaps",
+    is_flag=True,
+    help="Keep short gaps between lines (< 85 ms)"
+)
+def process(file: Path, out: Path | None, **__):
+    """SubRip (SRT) post-processing."""
+    if not isinstance(file, Path):
+        raise click.ClickException(f"Expected file to be a {Path} not {file!r}")
+    if out and not isinstance(out, Path):
+        raise click.ClickException(f"Expected out to be a {Path} not {out!r}")
+
+
+@process.command()
+@click.pass_context
+def mend(ctx: click.Context):
+    """Repair or Mend common issues in a Subtitle."""
+    file = ctx.parent.params["file"]
+
+    if not ctx.parent.params["out"]:
+        ctx.parent.params["out"] = file.with_stem(file.stem + "_mend")
+
+    log = logging.getLogger("process.mend")
+
+    processor = CommonIssuesFixer()
+    processor.remove_gaps = not ctx.parent.params["keep_short_gaps"]
+    processed_srt, status = processor.from_file(file, language=ctx.parent.params["language"])
+    log.info(f"Processed subtitle {['but no issues were found...', 'and repaired some issues!'][status]}")
+
+    return processed_srt, status
+
+
+@process.command("strip-sdh")
+@click.pass_context
+def strip_sdh(ctx: click.Context):
+    """Remove Hard-of-hearing descriptions from Subtitles."""
+    file = ctx.parent.params["file"]
+
+    if not ctx.parent.params["out"]:
+        ctx.parent.params["out"] = file.with_stem(file.stem + "_sdh_stripped")
+
+    log = logging.getLogger("process.strip_sdh")
+
+    processor = SDHStripper()
+    processed_srt, status = processor.from_file(file, language=ctx.parent.params["language"])
+    log.info(f"Processed subtitle {['but no SDH descriptions were found...', 'and removed SDH!'][status]}")
+
+    if not ctx.parent.params["no_post_processing"]:
+        processor = CommonIssuesFixer()
+        processor.remove_gaps = not ctx.parent.params["keep_short_gaps"]
+        processed_srt, _ = processor.from_srt(processed_srt, language=ctx.parent.params["language"])
+        log.info(
+            "Processed stripped subtitle "
+            + ['but no issues were found...', 'and repaired some issues!'][status]
+        )
+
+    return processed_srt, status
+
+
+@process.result_callback()
+def process_result(result, out, encoding, *_, **__):
+    log = logging.getLogger("process")
+    processed_srt, status = result
+    if status:
+        processed_srt.save(out, encoding=encoding)
+        log.info(f"Saved to: {out}")
+        log.debug(f"Used character encoding {encoding}")
diff --git a/scripts/subby/subby/converters/__init__.py b/scripts/subby/subby/converters/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/scripts/subby/subby/converters/base.py b/scripts/subby/subby/converters/base.py
new file mode 100644
index 0000000..4464f9c
--- /dev/null
+++ b/scripts/subby/subby/converters/base.py
@@ -0,0 +1,27 @@
+from abc import ABC, abstractmethod
+from io import BytesIO
+from pathlib import Path
+from typing import BinaryIO
+
+from subby.subripfile import SubRipFile
+
+
+class BaseConverter(ABC):
+    """Base subtitle converter class"""
+
+    def from_file(self, file: Path) -> SubRipFile:
+        """Reads a given file and converts it to srt"""
+        with file.open(mode='rb') as stream:
+            return self.parse(stream)
+
+    def from_string(self, data: str) -> SubRipFile:
+        """Reads a given string and converts it to srt"""
+        return self.parse(BytesIO(data.encode('utf-8')))
+
+    def from_bytes(self, data: bytes) -> SubRipFile:
+        """Parses given data and converts it to srt"""
+        return self.parse(BytesIO(data))
+
+    @abstractmethod
+    def parse(self, stream: BinaryIO) -> SubRipFile:
+        """Parses data from a given stream and converts it to srt"""
diff --git a/scripts/subby/subby/converters/bilibili_json.py b/scripts/subby/subby/converters/bilibili_json.py
new file mode 100644
index 0000000..2559cc8
--- /dev/null
+++ b/scripts/subby/subby/converters/bilibili_json.py
@@ -0,0 +1,27 @@
+import datetime
+import json
+
+from srt import Subtitle
+
+from subby.converters.base import BaseConverter
+from subby.subripfile import SubRipFile
+
+
+class BilibiliJSONConverter(BaseConverter):
+    """Bilibili JSON subtitle converter"""
+
+    def parse(self, stream):
+        json_data = json.load(stream)
+        srt = SubRipFile()
+        for i, line in enumerate(json_data['body']):
+            if line['location'] != 2:
+                line['content'] = ('{\\an%s}' % line['location']) + line['content']
+
+            srt.append(Subtitle(
+                index=i,
+                start=datetime.timedelta(seconds=line['from']),
+                end=datetime.timedelta(seconds=line['to']),
+                content=line['content']
+            ))
+
+        return srt
diff --git a/scripts/subby/subby/converters/mp4.py b/scripts/subby/subby/converters/mp4.py
new file mode 100644
index 0000000..05fd110
--- /dev/null
+++ b/scripts/subby/subby/converters/mp4.py
@@ -0,0 +1,111 @@
+from collections import deque
+
+from pymp4.parser import MP4
+from pymp4.util import BoxUtil
+
+from subby.converters.base import BaseConverter
+from subby.converters.smpte import SMPTEConverter
+from subby.converters.webvtt import WebVTTConverter
+from subby.subripfile import SubRipFile
+from subby.utils.time import timestamp_from_ms
+
+
+class ISMTConverter(BaseConverter):
+    """ISMT (DFXP in MP4) subtitle converter"""
+
+    def parse(self, stream):
+        srt = SubRipFile([])
+        for box in MP4.parse(stream.read()):
+            if box.type == b'mdat':
+                new = SMPTEConverter().from_bytes(box.data)
+
+                # Offset timecodes if necessary
+                # https://github.com/SubtitleEdit/subtitleedit/blob/abd36e5/src/libse/SubtitleFormats/IsmtDfxp.cs#L85-L90
+                if srt and new and srt[-1].start > new[0].start:
+                    new.offset(srt[-1].end)
+
+                srt.extend(new)
+
+        return srt
+
+
+class WVTTConverter(BaseConverter):
+    """WVTT (WebVTT in MP4) subtitle converter"""
+
+    def parse(self, stream):  # pylint: disable=too-many-locals, too-many-branches
+        sample_durations = deque()
+        vtt_lines = []
+        timescale = 0
+
+        for box in MP4.parse(stream.read()):
+            if box.type == b'moov':
+                for mdhd in BoxUtil.find(box, b'mdhd'):
+                    timescale = mdhd.timescale
+                    break
+
+                for stsd in BoxUtil.find(box, b'stsd'):
+                    wvtt = stsd.entries[0]
+                    header = [box.config for box in wvtt.children
+                              if box.type == b'vttC'][0]
+                    vtt_lines.append(f'{header}\n\n')
+                    break
+
+            if box.type == b'moof':
+                start_offset = 0
+                duration = 0
+                for tfdt in BoxUtil.find(box, b'tfdt'):
+                    start_offset = tfdt.baseMediaDecodeTime
+                    break
+
+                for trun in BoxUtil.find(box, b'trun'):
+                    for sample in trun.sample_info:
+                        start_offset += sample.sample_composition_time_offsets or 0
+                        duration += sample.sample_duration or 0
+                        sample_durations.append({
+                            'start_ms': (start_offset / timescale) * 1000,
+                            'end_ms': ((start_offset + duration) / timescale) * 1000
+                        })
+
+            if box.type == b'mdat':
+                vtt_boxes = MP4.parse(box.data)
+                new_start = None
+                for vtt_box in vtt_boxes:
+                    settings = None
+                    for sttg in BoxUtil.find(vtt_box, b'sttg'):
+                        settings = sttg.settings
+                        break
+
+                    cue_text = None
+                    for payl in BoxUtil.find(vtt_box, b'payl'):
+                        cue_text = payl.cue_text
+                        break
+
+                    try:
+                        sample_duration = sample_durations.popleft()
+                    except IndexError:  # broken line, no durations found
+                        continue
+
+                    if vtt_box.type == b'vttc':
+                        try:
+                            start_ms = end_ms
+                        except UnboundLocalError:
+                            end_ms = sample_duration['end_ms']
+                            start_ms = end_ms
+                    else:
+                        start_ms = sample_duration['start_ms']
+
+                    end_ms = sample_duration['end_ms']
+
+                    if vtt_box.type == b'vtte':
+                        new_start = end_ms
+                        continue
+
+                    if new_start:
+                        start_ms = new_start
+                        new_start = None
+
+                    vtt_lines.append((f'{timestamp_from_ms(start_ms)} --> '
+                                      f'{timestamp_from_ms(end_ms)} '
+                                      f'{settings}\n{cue_text}\n\n'))
+
+        return WebVTTConverter().from_string(''.join(vtt_lines))
diff --git a/scripts/subby/subby/converters/sami.py b/scripts/subby/subby/converters/sami.py
new file mode 100644
index 0000000..ea261e4
--- /dev/null
+++ b/scripts/subby/subby/converters/sami.py
@@ -0,0 +1,90 @@
+from html.parser import HTMLParser
+
+from srt import Subtitle
+
+from subby.converters.base import BaseConverter
+from subby.subripfile import SubRipFile
+from subby.utils.time import timedelta_from_ms
+
+
+class SAMIConverter(BaseConverter):
+    """SAMI subtitle converter"""
+
+    def parse(self, stream):
+        return _SAMIConverter(stream.read().decode('utf-8-sig')).srt
+
+
+# Internal converter class as we inherit from HTMLParser
+class _SAMIConverter(HTMLParser):
+    def __init__(self, subtitle):
+        super().__init__()
+        self.lines = []
+        self.tags = []
+
+        self.srt = SubRipFile([])
+        self.line_list = []
+
+        self.feed(self._correct_tags(subtitle))
+        self._convert()
+
+    def handle_starttag(self, tag, attrs_org):
+        attrs = {}
+        for attr, val in attrs_org:
+            attrs[attr] = val
+
+        if tag == 'sync':
+            data = {'text': ''}
+            data.update(attrs)
+            self.lines.append(data)
+
+        self.tags.append({'name': tag, 'attrs': attrs})
+
+    def handle_data(self, data):
+        last_tag = self.tags[-1]['name']
+        if last_tag == 'br':
+            self.lines[-1]['text'] += '\n'
+            return
+
+        if last_tag == 'i' and data.strip():
+            self.lines[-1]['text'] += f'<i>{data}</i>'
+            return
+
+        if last_tag != 'sync' and self.lines:
+            self.lines[-1]['text'] += data
+
+    def _convert(self):
+        for num, line in enumerate(self.lines):
+            # Use empty lines as the end of previous line
+            if not line.get('text', '').strip():
+                end_time = float(line['start'])
+                self.line_list[-1]['end'] = end_time
+                continue
+
+            if not line.get('end'):
+                # Arbitrarily set duration to 4s if end time not present
+                line['end'] = float(line['start']) + 4000
+
+            srt_line = {
+                'start': float(line['start']),
+                'end': float(line['end']),
+                'content': line['text'].strip()
+            }
+            self.line_list.append(srt_line)
+
+        for num, line in enumerate(self.line_list):
+            srt_line = Subtitle(
+                index=num,
+                start=timedelta_from_ms(line['start']),
+                end=timedelta_from_ms(line['end']),
+                content=line['content']
+            )
+            self.srt.append(srt_line)
+
+    @staticmethod
+    def _correct_tags(data):
+        data = data.replace('<i/>', '<i>')
+        data = data.replace(';>', '>')
+        data = data.replace('<br>', '\n')
+        data = data.replace('<br/>', '\n')
+        data = data.replace('<br >', '\n')
+        return data
diff --git a/scripts/subby/subby/converters/smpte.py b/scripts/subby/subby/converters/smpte.py
new file mode 100644
index 0000000..e5d7f38
--- /dev/null
+++ b/scripts/subby/subby/converters/smpte.py
@@ -0,0 +1,168 @@
+import html
+import logging
+import re
+
+import bs4
+from srt import Subtitle
+
+from subby.converters.base import BaseConverter
+from subby.subripfile import SubRipFile
+from subby.utils.time import timedelta_from_timestamp, timestamp_from_ms
+
+
+class SMPTEConverter(BaseConverter):
+    """DFXP/TTML/TTML2 subtitle converter"""
+
+    def parse(self, stream):
+        data = stream.read().decode('utf-8-sig')
+
+        if data.count('</tt>') == 1:
+            return _SMPTEConverter(data).srt
+
+        # Support for multiple XML documents in a single file
+        smpte_subs = [s + '</tt>' for s in data.strip().split('</tt>') if s]
+        srt = SubRipFile([])
+
+        for sub in smpte_subs:
+            srt.extend(_SMPTEConverter(sub).srt)
+
+        return srt
+
+
+# Internal converter class as we need to handle multiple subs in one stream
+class _SMPTEConverter:
+    def __init__(self, data):
+        self.logger = logging.getLogger(__name__)
+        self.root = bs4.BeautifulSoup(data, 'lxml-xml')
+        # Unescape only if necessary (parsing fails)
+        if not self.root:
+            self.root = bs4.BeautifulSoup(html.unescape(data), 'lxml-xml')
+
+        self.srt = SubRipFile([])
+
+        self.tickrate = int(self.root.tt.get('ttp:tickRate', 0))
+        self.frame_duration = 1
+        if (rate := self.root.tt.get('ttp:frameRate')) is not None:
+            num, denom = map(int, self.root.tt.get('ttp:frameRateMultiplier', '1 1').split())
+            framerate = (int(rate) * num) / denom
+            self.frame_duration = (1 / framerate) * 1000  # ms
+
+        self.italics = {}
+        self.an8 = {}
+        self.all_span_italics = '<span tts:fontStyle="italic">' not in data
+
+        self._parse_styles()
+        self._convert()
+
+    def _convert(self):
+        try:
+            assert self.root.tt.body.div is not None
+        except (AttributeError, AssertionError):
+            return
+
+        for num, line in enumerate(self.root.tt.body.div.find_all('p'), 1):
+            line_text = ''
+
+            try:
+                for time in ('begin', 'end'):
+                    if line[time].endswith('t'):
+                        line[time] = self._convert_ticks(line[time])
+                    elif line[time].endswith('ms'):
+                        line[time] = timestamp_from_ms(line[time][:-2])
+                    else:
+                        line[time] = self._parse_timestamp(line[time])
+            except (AttributeError, KeyError):
+                self.logger.warning(
+                    'Could not parse %s timestamp for line %02d, skipping',
+                    time, num
+                )
+                continue
+
+            srt_line = Subtitle(
+                index=num,
+                start=timedelta_from_timestamp(line['begin']),
+                end=timedelta_from_timestamp(line['end']),
+                content=''
+            )
+
+            for element in line:
+                line_text += self._parse_element(element)
+
+            if self._is_italic(line) and line_text.strip():
+                line_text = line_text.replace('<i>', '')
+                line_text = line_text.replace('</i>', '')
+                line_text = '<i>%s</i>' % line_text.strip()
+
+            if self._is_an8(line) and line_text.strip():
+                line_text = '{\\an8}%s' % line_text.strip()
+
+            srt_line.content = line_text.strip().strip('\n')
+            if srt_line.content:
+                self.srt.append(srt_line)
+
+    def _parse_styles(self):
+        for style in self.root.find_all('style'):
+            if style.get('xml:id'):
+                self.italics[style['xml:id']] = self._is_italic(style)
+        for region in self.root.find_all('region'):
+            if region.get('xml:id'):
+                self.an8[region['xml:id']] = self._is_an8(region)
+
+    def _parse_element(self, element):
+        element_text = ''
+        if isinstance(element, bs4.element.NavigableString):
+            element_text += element
+        elif isinstance(element, bs4.element.Tag):
+            subelement_text = ''
+            for subelement in element:
+                subelement_text += self._parse_element(subelement)
+            element_text += subelement_text
+            if element.name == 'br':
+                element_text += '\n'
+
+            if self._is_italic(element) and element_text.strip():
+                element_text = element_text.replace('<i>', '')
+                element_text = element_text.replace('</i>', '')
+                element_text = '<i>%s</i>' % element_text
+
+            if self._is_an8(element) and element_text.strip():
+                element_text = '{\\an8}%s' % element_text
+
+        return element_text
+
+    def _is_italic(self, element):
+        if element.get('tts:fontStyle'):
+            return element.get('tts:fontStyle') == 'italic'
+        elif element.get('style'):
+            return self.italics.get(element['style'])
+        elif element.name == 'span' and not element.attrs and self.all_span_italics:
+            return not self._is_italic(element.parent)
+
+        return False
+
+    def _is_an8(self, element):
+        if element.get('tts:displayAlign'):
+            return element.get('tts:displayAlign') == 'before'
+        elif element.get('region'):
+            return self.an8.get(element['region'])
+
+        return False
+
+    def _convert_ticks(self, ticks):
+        ticks = int(ticks[:-1])
+        offset = 1.0 / self.tickrate
+        seconds = (offset * ticks) * 1000
+
+        return timestamp_from_ms(seconds)
+
+    def _parse_timestamp(self, timestamp):
+        regex = r'([0-9]{2}):([0-9]{2}):([0-9]{2})[:\.,]?([0-9]{0,3})?'
+        parsed = re.search(regex, timestamp)
+        hours = int(parsed.group(1))
+        minutes = int(parsed.group(2))
+        seconds = int(parsed.group(3))
+        miliseconds = 0
+        if frames := parsed.group(4):
+            miliseconds = self.frame_duration * int(frames)
+
+        return "%02d:%02d:%02d.%03d" % (hours, minutes, seconds, miliseconds)
diff --git a/scripts/subby/subby/converters/webvtt.py b/scripts/subby/subby/converters/webvtt.py
new file mode 100644
index 0000000..80f00f7
--- /dev/null
+++ b/scripts/subby/subby/converters/webvtt.py
@@ -0,0 +1,162 @@
+from __future__ import annotations
+
+import html
+import re
+from functools import partial
+from typing import Optional
+
+import tinycss
+from srt import Subtitle
+
+from subby.converters.base import BaseConverter
+from subby.subripfile import SubRipFile
+from subby.utils.time import timedelta_from_timestamp
+
+HTML_TAG = re.compile(r'</?(?!/?i)[^>\s]+>')
+STYLE_TAG_OPEN = re.compile(r'^<c.([a-zA-Z0-9]+)>([^<]+)')
+STYLE_TAG = re.compile(r'<c.([a-zA-Z0-9]+)>([^<]+)<\/c>')
+STYLE_TAG_CLOSE = re.compile(r'<\/c>$')
+SKIP_WORDS = ('WEBVTT', 'NOTE', '/*', 'X-TIMESTAMP-MAP')
+SPEAKER_TAG = re.compile(r'<v\s+[^>]+>')  # Matches opening <v Name> tags, closing tags handled by STYLE_TAG_CLOSE
+
+
+class WebVTTConverter(BaseConverter):
+    """WebVTT subtitle converter"""
+
+    def parse(self, stream):
+        srt = SubRipFile()
+        looking_for_text = False
+        looking_for_style = False
+        text = []
+        position = None
+        line_number = 1
+        styles = {}
+        current_style = []
+
+        css_parser = tinycss.make_parser('page3')
+
+        for line in stream:
+            # As our stream is bytes we have to deal with line breaks here
+            line = line.decode('utf-8').replace('\r\n', '\n').replace('\r', '\n').strip()
+
+            # Skip processing any unnecessary lines
+            if any(line.startswith(word) for word in SKIP_WORDS):
+                continue
+
+            # Empty line separates cues
+            if line == '':
+                # Parse current style
+                if looking_for_style:
+                    stylesheet = css_parser.parse_stylesheet('\n'.join(current_style))
+                    for rule in stylesheet.rules:
+                        ft = next((e for e in rule.selector if e.type == 'FUNCTION'), None)
+                        if not ft:
+                            continue
+                        name = next((t for t in ft.content if t.type == 'IDENT'), None)
+                        if not name:
+                            continue
+                        styles[name.value] = {}
+                        for dec in rule.declarations:
+                            styles[name.value][dec.name] = dec.value.as_css()
+
+                    looking_for_style = False
+
+                # Keep looking for text if last line has none
+                # this will only happen if there's an unexpected line break
+                if not text:
+                    continue
+
+                srt[-1].content = '\n'.join(text)
+                text = []
+                looking_for_text = False
+
+            # Check for style start
+            elif 'STYLE' in line:
+                looking_for_style = True
+
+            # Check for style content
+            elif looking_for_style:
+                current_style.append(line)
+
+            # Check for time line
+            elif ' --> ' in line:
+                parts = line.strip().split()
+                position = self._get_position([p for p in parts[3:] if ':' in p])
+
+                start, _, end, *_ = parts
+                # Fix short timecodes (no hour)
+                if start.count(':') == 1:
+                    start = f'00:{start}'
+                if end.count(':') == 1:
+                    end = f'00:{end}'
+
+                srt.append(Subtitle(
+                    index=line_number,
+                    start=timedelta_from_timestamp(start),
+                    end=timedelta_from_timestamp(end),
+                    content=''
+                ))
+                looking_for_text = True
+                line_number += 1
+
+            # Append text if we're inside a line
+            elif looking_for_text:
+                # Unescape html entities
+                line = html.unescape(line)
+
+                # Remove speaker tags here
+                line = re.sub(SPEAKER_TAG, '', line)
+
+                # Set \an8 tag if position is below 25
+                # (value taken from SubtitleEdit)
+                if position is not None and position < 25:
+                    line = '{\\an8}' + line
+                    position = None
+
+                text.append(line.strip())
+
+        # Add any leftover text to the last line
+        if text:
+            srt[-1].content += '\n'.join(text)
+
+        for line in srt:
+            # Replace styles with italics tag when appropriate
+            # (replace instead of match, to handle nested)
+            line.content = re.sub(
+                STYLE_TAG,
+                partial(self._replace_italics, styles=styles),
+                line.content
+            )
+
+            # Strip non-italic tags
+            line.content = re.sub(HTML_TAG, '', line.content)
+
+        return srt
+
+    @staticmethod
+    def _get_position(cue_settings: list[str]) -> Optional[float]:
+        """
+        Parses list of cue settings and extracts position offset as a float
+        Line number based offset and alignment strings are ignored
+
+        https://www.w3.org/TR/webvtt1/#webvtt-line-cue-setting
+        """
+        if not cue_settings or cue_settings == ['None']:
+            return None
+
+        position = None
+        for key, val in (pos.split(':') for pos in cue_settings):
+            if key == 'line' and val and (val := val.split(',')[0])[-1] == '%':
+                position = float(val[:-1])
+                break
+            elif key == 'line' and val and val == '0':
+                position = 0
+                break
+
+        return position
+
+    @staticmethod
+    def _replace_italics(match: re.Match, styles: dict[str, dict[str, str]]) -> str:
+        if (s := styles.get(match[1])) and s.get('font-style') == 'italic':
+            return f'<i>{match[2]}</i>'
+        return match[0]
diff --git a/scripts/subby/subby/processors/__init__.py b/scripts/subby/subby/processors/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/scripts/subby/subby/processors/base.py b/scripts/subby/subby/processors/base.py
new file mode 100644
index 0000000..5e99e2d
--- /dev/null
+++ b/scripts/subby/subby/processors/base.py
@@ -0,0 +1,30 @@
+from __future__ import annotations
+
+from abc import ABC, abstractmethod
+from pathlib import Path
+
+from subby.subripfile import SubRipFile
+
+
+class BaseProcessor(ABC):
+    """Base subtitle processor class"""
+
+    def from_srt(self, srt: SubRipFile, language: str | None = None) -> tuple[SubRipFile, bool]:
+        """Processes given SubRipFile"""
+        return self.process(srt, language)
+
+    def from_file(self, file: Path, language: str | None = None) -> tuple[SubRipFile, bool]:
+        """Processes given srt file"""
+        with file.open(mode='r', encoding='utf-8') as stream:
+            return self.from_string(stream.read(), language)
+
+    def from_string(self, data: str, language: str | None = None) -> tuple[SubRipFile, bool]:
+        """Processes given string with srt subtitles"""
+        return self.process(SubRipFile.from_string(data), language)
+
+    @abstractmethod
+    def process(self, srt: SubRipFile, language: str | None = None) -> tuple[SubRipFile, bool]:
+        """
+        Processes given SubRipFile
+        :return: Processed SubRipFile, success (whether any changes were made)
+        """
diff --git a/scripts/subby/subby/processors/common_issues.py b/scripts/subby/subby/processors/common_issues.py
new file mode 100644
index 0000000..83425d1
--- /dev/null
+++ b/scripts/subby/subby/processors/common_issues.py
@@ -0,0 +1,278 @@
+import copy
+import datetime
+import html
+import re
+import unicodedata
+from datetime import timedelta
+
+import langcodes
+
+from subby import regex as Regex
+from subby.processors.base import BaseProcessor
+from subby.processors.rtl import RTL_LANGUAGES, RTLFixer
+from subby.subripfile import SubRipFile
+from subby.utils.time import line_duration
+
+
+class CommonIssuesFixer(BaseProcessor):
+    """Processor fixing common issues found in subtitles"""
+
+    remove_gaps = True
+
+    def process(self, srt, language=None):
+        fixed = self._fix_time_codes(copy.deepcopy(srt))
+        corrected = self._correct_subtitles(fixed)
+
+        if language and langcodes.get(language).language in RTL_LANGUAGES:
+            corrected, _ = RTLFixer().process(corrected, language=language)
+
+        return corrected, corrected != srt
+
+    def _correct_subtitles(self, srt: SubRipFile) -> SubRipFile:
+        def _fix_line(line):
+            # [GENERAL] - Affects other regexes
+            # Remove more than one space
+            line = re.sub(r' {2,}', ' ', line)
+            # Correct lines starting with space
+            line = re.sub(r'^\s*', '', line)
+            line = re.sub(r'\n\s*', '\n', line)
+            #
+            # [ENCODING FIXES, CHARACTER REPLACEMENTS]
+            # Fix musical notes garbled by encoding
+            # has to happen before normalization as that replaces the TM char
+            line = line.replace(r'♪', '♪')
+            # Normalize unicode characters
+            line = unicodedata.normalize('NFKC', line)
+            # Replace short hyphen with regular size
+            line = line.replace(r'‐', r'-')
+            # Replace double note with single note
+            line = line.replace(r'♫', r'♪')
+            # Replace hashes, asterisks at the start of a line with a musical note
+            line = re.sub(
+                r'^((?:{\\an8})?(?:<i>)?)(- ?)?[#\*]{1,}(?=\s+)',
+                r'\1\2♪',
+                line,
+                flags=re.M
+            )
+            # Replace hashes, asterisks at the end of a line with a musical note
+            line = re.sub(
+                r'(?<=\s)(?<![#\*])(?:[#\*]{1,3}|[#\*]{1,3})(?![0-9A-Z])(</i>$|$)',
+                r'♪\1',
+                line,
+                flags=re.M
+            )
+            line = re.sub(r'^[#\*]+$', r'♪', line, flags=re.M)
+            # Move notes into italics, if rest of the line is
+            line = re.sub(r'♪ <i>(.*)', r'<i>♪ \1', line)
+            line = re.sub(r'(♪.*)</i>\s*♪', r'\1 ♪</i>', line)
+            # Replace some pound signs with notes (Binge...)
+            # (Matches only start/end of a line with a space
+            # to avoid false positives)
+            line = re.sub(r'^£ ', r'♪ ', line)
+            line = re.sub(r' £$', r' ♪', line)
+            # Duplicated notes
+            line = re.sub(r'♪{1,}', r'♪', line)
+            # Add spaces between notes and text
+            line = re.sub(r'^♪([A-Za-z])', r'♪ \1', line)
+            line = re.sub(r'([A-Za-z])♪', r'\1 ♪', line)
+            # Replace \h (non-breaking space in ASS) with a regular space
+            # (result of ffmpeg extraction of mp4-embedded subtitles)
+            line = re.sub(r'(\\h)+', ' ', line).strip()
+            # Fix leftover amps (html unescape fixes those, but not when they're duped)
+            line = re.sub(r'&(amp;){1,}', r'&', line)
+            # Fix "it'`s" -> "it's"
+            line = re.sub(r"'[`’]", r"'", line)
+
+            # [TAG STRIPPING AND CORRECTING]
+            #
+            # Replace ASS positioning tags with top only
+            line = re.sub(r'(\{\\an[0-9]\}){1,}', r'{\\an8}', line)
+            # Remove space after ASS positioning tags
+            line = re.sub(r'(\{\\an[0-9]\}) +(?=[A-Za-z-])', r'{\\an8}', line)
+            # Fix hanging tags
+            line = re.sub(r'^(<[a-z]>)\n', r'\1', line)
+            line = re.sub(r'</([a-z])>$\n<([a-z])>', r'\n', line, flags=re.M)
+            # Remove duplicated tags
+            line = re.sub(r'(<[a-z]>){1,}', r'\1', line)
+            line = re.sub(r'(</[a-z]>){1,}', r'\1', line)
+            # Remove an unnecessary space after italic tag open
+            line = re.sub(r'^(<[a-z]>) {1,}', r'\1', line)
+            line = re.sub(r'^ {1,}', '', line)
+            # Remove non-italic tags
+            line = re.sub(r'</?(?!i>)[a-z]+>', '', line)
+            # Remove spaces between tags
+            line = re.sub(r'(<[a-z]>|\{\\an8\}) (<[a-z]>|\{\\an8\})', r'\1\2', line)
+            # Move hanging opening tags onto separate lines
+            line = re.sub(r'(<[a-z]>)\n', r'\n\1', line)
+            # Move hanging closing tags onto separate lines
+            line = re.sub(r'\n(</[a-z]>)', r'\1\n', line)
+            # Move spaces outside italic tags
+            line = re.sub(r'(<[a-z]>) ', r' \1', line)
+            line = re.sub(r' (</[a-z]>)', r'\1 ', line)
+            # Remove needless spaces inside italic tags
+            line = re.sub(r'^(<[a-z]>) ', r'\1', line)
+            # Fix "</tag>space<tag>"
+            line = re.sub(r'(?:</[a-z]>)(\s*)(?:<[a-z]>)', r'\1', line, flags=re.M)
+            # Remove empty tags
+            line = re.sub(r'<[a-z]>\s*</[a-z]>', r'', line)
+            # Move "{\an8}" to the rest of the text if it's on a new line
+            line = re.sub(r'({\\an8\})\n', r'\1', line)
+
+            # [REFORMATTING]
+            #
+            # Remove spaces inside brackets ("( TEXT )" -> "(TEXT)")
+            line = re.sub(r'\( (.*) \)', r'(\1)', line)
+            # Remove ">> " before text
+            line = re.sub(r'(^|\n)(</?[a-z]>|\{\\an8\})?>> ', r'\1\2', line)
+            # Remove lines consisting only of ">>"
+            line = re.sub(r'(^|\n)(</?[a-z]>|\{\\an8\})?>>($|\n)', r'', line)
+            # Replace any leftover <br> tags with a proper line break
+            line = re.sub(r'<br ?\/?>', '\n', line)
+            # Remove empty lines
+            line = re.sub(r'^\.?\s*$', '', line, flags=re.M)
+            line = re.sub(r'^-?\s*$', '', line, flags=re.M)
+            line = re.sub(r'^(</?i>|\{\\an8\})?\s*$', '', line, flags=re.M)
+            # Remove lines consisting only of a single character or digit
+            line = re.sub(r'^\[A-Za-z0-9]$', '', line)
+            # Adds missing spaces after "...", commas, and tags
+            line = re.sub(r'([a-z])(\.\.\.)([a-zA-Z][^.])', r'\1\2 \3', line)
+            line = re.sub(r'(</[a-z]>)(\w)', r'\1 \2', line)
+            line = re.sub(r'([a-z]),([a-zA-Z])', r'\1, \2', line)
+            line = re.sub(r',\n([a-z]+[\.\?])\s*$', r', \1', line)
+            # Correct front and end elypses
+            line = re.sub(
+                rf'({Regex.FRONT_OPTIONAL_TAGS_WITH_HYPHEN})' r'\.{1,}',
+                r'\1...',
+                line, flags=re.M
+            )
+            line = re.sub(r'\.{2,}' rf'({Regex.TAGS})?' r'\s*$', r'...\1', line, flags=re.M)
+            # Add space after frontal speaker hyphen
+            line = re.sub(r"^(<i>|\{\\an8\})?-+(?='?[\w\"\[\(\<\{\.\$♪¿¡])", r'\1- ', line, flags=re.M)
+            # Remove unnecessary space before "--"
+            line = re.sub(r'\s*--(\s*)', r'--\1', line, flags=re.M)
+            # Move notes inside tags (</i> ♪ -> </i>)
+            line = re.sub(r'(</[a-z]>)(\s*♪{1,})$', r'\2\1', line, flags=re.M)
+            # Remove trailing spaces
+            line = re.sub(r' +$', r'', line, flags=re.M).strip()
+
+            # [LINE SPLITS AND LINE BREAKS]
+            #
+            # Adds missing line splits (primarily present in Amazon subtitles)
+            line = re.sub(r'(.*)([^.][\]\)])([A-Z][^.])', r'\1\2\n\3', line)
+            line = re.sub(
+                r'(.*)([^\.\sA-Z][!\.;:?])(?<!(?:Mr|Ms)\.)(?<!Mrs\.)([A-Z][^.])',
+                r'- \1\2\n- \3',
+                line
+            )
+            # Fix weird linebreaks (caused by stripping SDH or not)
+            line = re.sub(r'(^<[a-z]>|\n<[a-z]>)(\w+)\n', r'\1\2 ', line)
+            # Add missing hyphens
+            line = re.sub(r'^\s*(?!-)(.*)\n- ([A-Z][a-z]+)$', r'- \1\n- \2', line)
+            # Remove linebreaks inside lines
+            line = re.sub(r'\r\n{1,}', r'\r\n', line).strip()
+            line = re.sub(r'\n{1,}', r'\n', line).strip()
+            # Remove duplicate spaces around italics
+            line = re.sub(r' +</i> +', r'</i> ', line).strip()
+            # Remove italics from hyphen, when content immediately following is not italics
+            line = re.sub(r'<i>-</i>([^<]+)', r'-\1', line).strip()
+
+            return line
+
+        for line in srt:
+            # Unescape html entities (twice, because yes, double encoding happens...)
+            for _ in range(2):
+                line.content = html.unescape(line.content)
+
+            # Run fix_line twice, as some of the fixes can introduce issues, e.g. double spaces
+            for _ in range(2):
+                line.content = _fix_line(line.content)
+                line.content = line.content.strip()
+
+            # Remove remaining linebreaks
+            line.content = line.content.strip('\n')
+
+        # Remove italics if every line is italicized, as this is almost certainly a mistake
+        # (using slices should be more performant than regex or startswith/endswith)
+        if len(srt) > 10 \
+                and all(line.content[:3] == '<i>' and line.content[-4:] == '</i>' for line in srt):
+            for line in srt:
+                line.content = line.content[3:-4]
+
+        combined = self._combine_timecodes(srt)
+        if self.remove_gaps:
+            return self._remove_gaps(combined)
+
+        return combined
+
+    def _combine_timecodes(self, srt: SubRipFile) -> SubRipFile:
+        """Combines lines with timecodes and same content"""
+        subs_copy = SubRipFile([])
+        for line in srt:
+            if len(subs_copy) == 0:
+                subs_copy.append(line)
+                continue
+            if line_duration(subs_copy[-1]) == line_duration(line) \
+                    and subs_copy[-1].start == line.start \
+                    and subs_copy[-1].end == line.end:
+                if subs_copy[-1].content != line.content:
+                    subs_copy[-1].content += '\n' + line.content
+            # Merge lines with the same text within 10 ms
+            elif self._subtract_ts(line.start, subs_copy[-1].end) < 10 \
+                    and line.content == subs_copy[-1].content:
+                subs_copy[-1].end = line.end
+            # Merge lines with less than 2 frames of gap and same text
+            # to avoid duplicating lines as we remove gaps later
+            elif 0 < self._subtract_ts(line.start, subs_copy[-1].end) <= 85 \
+                    and line.content.startswith(subs_copy[-1].content) \
+                    and self.remove_gaps:
+                subs_copy[-1].end = line.end
+                subs_copy[-1].content = line.content
+            # Fix overlapping times
+            elif self._subtract_ts(line.start, subs_copy[-1].end) == 0:
+                subs_copy[-1].end -= timedelta(milliseconds=1)
+                subs_copy.append(line)
+            elif line.content.strip():
+                subs_copy.append(line)
+
+        subs_copy = subs_copy or srt
+        subs_copy.clean_indexes()
+        return subs_copy
+
+    def _remove_gaps(self, srt: SubRipFile) -> SubRipFile:
+        """Remove short gaps between lines"""
+        subs_copy = SubRipFile([])
+        for line in srt:
+            if len(subs_copy) == 0:
+                subs_copy.append(line)
+                continue
+            # Remove 2-frame or smaller gaps (2 frames/83ms@24 is Netflix standard)
+            elif 1 < self._subtract_ts(line.start, subs_copy[-1].end) <= 85:
+                line.start = subs_copy[-1].end
+                subs_copy[-1].end -= timedelta(milliseconds=1)
+                subs_copy.append(line)
+            elif line.content.strip():
+                subs_copy.append(line)
+
+        subs_copy = subs_copy or srt
+        subs_copy.clean_indexes()
+        return subs_copy
+
+    @staticmethod
+    def _fix_time_codes(srt: SubRipFile) -> SubRipFile:
+        """Fixes timecodes over 23:59, often present in live content"""
+        offset = 0
+        for line in srt:
+            hours, _ = divmod(line.start.seconds, 3600)
+            hours += line.start.days * 24
+
+            if not offset and hours > 23:
+                offset = hours
+            if offset:
+                line.start -= datetime.timedelta(hours=offset)
+                line.end -= datetime.timedelta(hours=offset)
+        return srt
+
+    @staticmethod
+    def _subtract_ts(ts1: datetime.timedelta, ts2: datetime.timedelta) -> int:
+        """Subtracts two timestamps and returns a difference as int of miliseconds"""
+        return round((ts1 - ts2).total_seconds() * 1000)
diff --git a/scripts/subby/subby/processors/rtl.py b/scripts/subby/subby/processors/rtl.py
new file mode 100644
index 0000000..0f324c8
--- /dev/null
+++ b/scripts/subby/subby/processors/rtl.py
@@ -0,0 +1,34 @@
+import logging
+
+import langcodes
+
+from subby.processors.base import BaseProcessor
+
+RTL_LANGUAGES = ('ar', 'fa', 'he', 'ps', 'syc', 'ug', 'ur')
+RTL_CONTROL_CHARS = ('\u200e', '\u200f', '\u202a', '\u202b', '\u202c', '\u202d', '\u202e')
+RTL_CHAR = '\u202b'
+
+
+class RTLFixer(BaseProcessor):
+    """Processor fixing right-to-left language tagging"""
+
+    def __init__(self):
+        self.logger = logging.getLogger(__name__)
+
+    def process(self, srt, language=None):
+        if language and langcodes.get(language).language not in RTL_LANGUAGES:
+            self.logger.warning('RTL tagger running on an unexpected language (%s)', language)
+
+        corrected = self._correct_subtitles(srt)
+        return srt, corrected != srt
+
+    def _correct_subtitles(self, srt):
+        for line in srt:
+            # Remove previous RTL-related formatting
+            for char in RTL_CONTROL_CHARS:
+                line.content = line.content.replace(char, '')
+
+            # Add RLM char at the start of every line
+            line.content = RTL_CHAR + line.content.replace("\n", f"\n{RTL_CHAR}")
+
+        return srt
diff --git a/scripts/subby/subby/processors/sdh.py b/scripts/subby/subby/processors/sdh.py
new file mode 100644
index 0000000..353f348
--- /dev/null
+++ b/scripts/subby/subby/processors/sdh.py
@@ -0,0 +1,109 @@
+from __future__ import annotations
+
+import copy
+import re
+
+from subby import regex as Regex
+from subby.processors.base import BaseProcessor
+from subby.subripfile import SubRipFile
+
+
+class SDHStripper(BaseProcessor):
+    """Processor removing hard-of-hearing descriptions from subtitles"""
+
+    def __init__(self, extra_regexes: list[str] | None = None):
+        self.extra_regexes = [
+            re.compile(regex, re.MULTILINE)
+            for regex in extra_regexes or []
+        ]
+
+    def process(self, srt, language=None):
+        stripped = [line for line in copy.deepcopy(srt)]
+        stripped = self._clean_full_line_descriptions(stripped)
+        stripped = self._clean_new_line_descriptions(stripped)
+        stripped = self._clean_inline_descriptions(stripped)
+        stripped = self._clean_speaker_names(stripped)
+        stripped = self._strip_notes(stripped)
+        stripped = self._remove_extra_hyphens(stripped)
+        stripped = self._run_extra_regexes(stripped)
+
+        stripped = SubRipFile([line for line in stripped if line.content])
+        stripped.clean_indexes()
+
+        return stripped, stripped != srt
+
+    def _clean_full_line_descriptions(self, srt):
+        """Removes full line descriptions"""
+        for line in srt:
+            text = self._strip_tags(line.content)
+            for regex in (Regex.FULL_LINE_DESCIRPTION_BRACKET, Regex.FULL_LINE_DESCIRPTION_PARENTHESES):
+                text = re.sub(regex, r'', text, flags=re.S).strip()
+
+            if not text:
+                continue
+
+            yield line
+
+    def _clean_new_line_descriptions(self, srt):
+        """Removes line descriptions taking up an entire line break"""
+        for line in srt:
+            position = re.match(Regex.POSITION_TAGS, line.content.strip())
+            for regex in (Regex.NEW_LINE_DESCRIPTION_BRACKET, Regex.NEW_LINE_DESCRIPTION_PARENTHESES):
+                line.content = re.sub(regex, r'', line.content, flags=re.M).strip()
+
+            # Restore position, if it has been removed with the description
+            if position and position[0] not in line.content:
+                line.content = position[0] + line.content
+
+            yield line
+
+    def _clean_inline_descriptions(self, srt):
+        """Removes inline"""
+        for line in srt:
+            line.content = re.sub(Regex.FRONT_DESCRIPTION_BRACKET, r'\10', line.content, flags=re.M)
+            line.content = re.sub(Regex.FRONT_DESCRIPTION_PARENTHESES, r'\1', line.content, flags=re.M)
+            for regex in (
+                Regex.END_DESCRIPTION_BRACKET,
+                Regex.END_DESCRIPTION_PARENTHESES,
+                Regex.INLINE_DESCRIPTION
+            ):
+                line.content = re.sub(regex, r'', line.content, flags=re.M)
+            line.content = line.content.strip()
+            yield line
+
+    def _clean_speaker_names(self, srt):
+        """Removes speaker names"""
+        for line in srt:
+            # Retain frontal tags/hyphens
+            for regex in (Regex.SPEAKER_PARENTHESES, Regex.SPEAKER):
+                line.content = re.sub(regex, r'\2\3', line.content, flags=re.M).strip()
+            yield line
+
+    def _strip_notes(self, srt):
+        """Removes lines with just musical notes"""
+        for line in srt:
+            if re.match(r'^♪+$', re.sub(r'\s*', r'', self._strip_tags(line.content).strip())):
+                continue
+
+            yield line
+
+    def _run_extra_regexes(self, srt):
+        """Runs extra regexes provided by user"""
+        for line in srt:
+            for regex in self.extra_regexes:
+                line.content = re.sub(regex, r'', line.content)
+            yield line
+
+    def _remove_extra_hyphens(self, srt):
+        """Remove speaker hyphens if there's only one line"""
+        for line in srt:
+            splits = len(re.findall(r'^(<i>|\{\\an8\})?-\s*', line.content, flags=re.M))
+            if splits == 1:
+                line.content = re.sub(r'^(<i>|\{\\an8\})?-\s*', r'\1', line.content.strip())
+
+            yield line
+
+
+    @staticmethod
+    def _strip_tags(text: str) -> str:
+        return re.sub(Regex.TAGS, r'', text)
diff --git a/scripts/subby/subby/regex.py b/scripts/subby/subby/regex.py
new file mode 100644
index 0000000..44496d6
--- /dev/null
+++ b/scripts/subby/subby/regex.py
@@ -0,0 +1,22 @@
+TAGS = r'[<{][/\\]?[a-z0-9.]+[}>]'
+POSITION_TAGS = r'^{\\an[0-9]}'
+FRONT_OPTIONAL_TAGS_WITH_HYPHEN = rf'^\s*({TAGS})?\s*(-)?\s*({TAGS})?\s*'
+TIME_LOOKAHEAD = r'(?![0-9]{2})'
+
+SPEAKER = rf'({FRONT_OPTIONAL_TAGS_WITH_HYPHEN})\s*(Mc[A-Z][a-zA-Z]+|[A-Z0-9\&\[\]\.#\' ]+\s*|[A-Z][a-z]+):{TIME_LOOKAHEAD} ?'
+SPEAKER_PARENTHESES = rf'({FRONT_OPTIONAL_TAGS_WITH_HYPHEN})\s*(?:[A-Z0-9\&\[\]\.#\' ]+\s*|[A-Z][a-z]+)(?: \([a-zA-Z ]+\)): ?'
+
+FRONT_NOTES = r'(?:♪+\s+)'
+BACK_NOTES = r'(?:\s+♪+)'
+
+DESCRIPTION_BRACKET = r'\[(?:[^\]]|\s)*\]'
+DESCRIPTION_PARENTHESES = r'\((?:[^\)]|\s)*\)'
+FULL_LINE_DESCIRPTION_BRACKET = rf'^-?\s*{FRONT_NOTES}?\[[^\]]+\]{BACK_NOTES}?$'
+NEW_LINE_DESCRIPTION_BRACKET = rf'^(?:{TAGS})?-?\s*{FRONT_NOTES}?{DESCRIPTION_BRACKET}(?:{TAGS})?{BACK_NOTES}?$'
+FRONT_DESCRIPTION_BRACKET = rf'^(?:{SPEAKER}|{SPEAKER_PARENTHESES})?({FRONT_OPTIONAL_TAGS_WITH_HYPHEN}){DESCRIPTION_BRACKET}:?'
+END_DESCRIPTION_BRACKET = rf'\s*{DESCRIPTION_BRACKET}\s*$'
+FULL_LINE_DESCIRPTION_PARENTHESES = rf'^-?\s*{FRONT_NOTES}?\([^\)]+\){BACK_NOTES}?$'
+NEW_LINE_DESCRIPTION_PARENTHESES = rf'^(?:{TAGS})?-?\s*{FRONT_NOTES}?{DESCRIPTION_PARENTHESES}{BACK_NOTES}?(?:{TAGS})?$'
+FRONT_DESCRIPTION_PARENTHESES = rf'^({FRONT_OPTIONAL_TAGS_WITH_HYPHEN})(?:{SPEAKER}|{SPEAKER_PARENTHESES})?{DESCRIPTION_PARENTHESES}:?'
+END_DESCRIPTION_PARENTHESES = rf'\s*{DESCRIPTION_PARENTHESES}:?\s*$'
+INLINE_DESCRIPTION = r'(?:<[a-z]+>)?[\[(][A-Za-z]+[)\]](?:</[a-z]+>)?'
diff --git a/scripts/subby/subby/subripfile.py b/scripts/subby/subby/subripfile.py
new file mode 100644
index 0000000..7bfa8c0
--- /dev/null
+++ b/scripts/subby/subby/subripfile.py
@@ -0,0 +1,38 @@
+from __future__ import annotations
+
+from collections import UserList
+from datetime import timedelta
+from pathlib import Path
+
+import srt
+
+
+class SubRipFile(UserList):
+    def __init__(self, data: list[srt.Subtitle] | None = None):
+        self.data: list[srt.Subtitle] = data or []
+
+    @classmethod
+    def from_string(cls, source: str):
+        return cls(list(srt.parse(source, ignore_errors=True)))
+
+    def clean_indexes(self):
+        self.data = list(srt.sort_and_reindex(self.data))
+
+    def offset(self, offset: timedelta):
+        for line in self.data:
+            line.start += offset
+            line.end += offset
+
+    def export(self, eol: str | None = None) -> str:
+        """Exports subtitle as text"""
+        return srt.compose(self.data, eol=eol)
+
+    def save(self, path: Path, encoding: str = 'utf-8-sig', eol: str | None = None):
+        """Exports subtitle as text"""
+        with path.open(mode='wb') as fp:
+            fp.write(srt.compose(self.data, eol=eol).encode(encoding))
+
+    def __eq__(self, other):
+        if not isinstance(other, SubRipFile):
+            raise NotImplementedError
+        return self.export(eol='\n') == other.export(eol='\n')
diff --git a/scripts/subby/subby/utils/time.py b/scripts/subby/subby/utils/time.py
new file mode 100644
index 0000000..443623a
--- /dev/null
+++ b/scripts/subby/subby/utils/time.py
@@ -0,0 +1,44 @@
+from __future__ import annotations
+
+import datetime
+import re
+
+from srt import Subtitle
+
+
+def timestamp_from_ms(duration: float | int) -> str:
+    """Returns a formatted timestamp from miliseconds"""
+    seconds, miliseconds = divmod(float(duration), 1000)
+    minutes, seconds = divmod(seconds, 60)
+    hours, minutes = divmod(minutes, 60)
+    return "%02d:%02d:%02d.%03d" % (hours, minutes, seconds, miliseconds)
+
+
+def timestamp_from_seconds(duration: float | int) -> str:
+    """Returns a formatted timestamp from seconds"""
+    return timestamp_from_ms(duration * 1000)
+
+
+def ms_from_timestamp(timestamp: str) -> int:
+    """Returns miliseconds from a timestamp"""
+    timestamp = re.sub(r'[;\.\,]', r':', timestamp.replace('T:', ''))
+    hours, minutes, seconds, miliseconds = map(int, timestamp.split(':'))
+    miliseconds += hours * 3600000
+    miliseconds += minutes * 60000
+    miliseconds += seconds * 1000
+    return miliseconds
+
+
+def timedelta_from_timestamp(timestamp: str) -> datetime.timedelta:
+    """Returns timedelta from a timestamp"""
+    return datetime.timedelta(seconds=ms_from_timestamp(timestamp) / 1000)
+
+
+def timedelta_from_ms(duration: float | int) -> datetime.timedelta:
+    """Returns timedelta from miliseconds"""
+    return datetime.timedelta(seconds=duration / 1000)
+
+
+def line_duration(line: Subtitle):
+    """Returns duration of a srt.Subtitle line"""
+    return abs(line.end - line.start)