libass

{
  "aliases": [],
  "alternatives": [
    "ffmpeg",
    "mpv",
    "vsfilter"
  ],
  "build_dependencies": [
    "pkgconf"
  ],
  "categories": [
    "library",
    "video-tool"
  ],
  "caveats": null,
  "conflicts_with": [],
  "dependencies": [
    "freetype",
    "fribidi",
    "harfbuzz",
    "libunibreak"
  ],
  "deprecated": 0,
  "deprecation_reason": null,
  "desc": "Subtitle renderer for the ASS/SSA subtitle format",
  "disable_reason": null,
  "disabled": 0,
  "enrichment_fetched_at": "2026-06-20T23:40:49+00:00",
  "first_seen": "2026-06-20T23:34:18+00:00",
  "full_name": "libass",
  "github_default_branch": "master",
  "github_last_commit_at": "2026-06-18T19:19:21Z",
  "github_readme_excerpt": "libass [![Coverity scan build status](https://scan.coverity.com/projects/3531/badge.svg)](https://scan.coverity.com/projects/3531) [![Build status](https://github.com/libass/libass/actions/workflows/ghci.yml/badge.svg?branch=master\u0026event=push)](https://github.com/libass/libass/actions/workflows/ghci.yml?query=branch%3Amaster+event%3Apush)\n======\nlibass is a portable subtitle renderer for the ASS/SSA (Advanced Substation Alpha/Substation Alpha) subtitle format. It is mostly compatible with VSFilter.\n\nGet it\n======\nSee [GitHub releases](https://github.com/libass/libass/releases) for the latest release 0.17.4 (released 2025-06-07).\nSee the [changelog](https://github.com/libass/libass/blob/master/Changelog) for a detailed list of changes.\n\nSource code is available from our [GitHub repository](https://github.com/libass/libass).\n\nContact\n=======\nPlease use the [issue tracker](https://github.com/libass/libass/issues?state=open) to report bugs or feature requests.\n\nWe have an IRC channel, too. Talk to us on [irc.libera.chat/#libass](https://web.libera.chat/#libass). Note that we cannot be online all the time and we cannot answer IRC questions if you leave the channel. Even if you do not get an immediate response, keep your IRC client open, and we will eventually get back to you.\n\nBuilding\n========\n\nlibass offers two build systems to choose from: Autotools and Meson.\n\nAutotools is preferred for development since it integrates with our testing\ninfrastructure and is feature-complete on all platforms supported by Autotools.  \nIf you are packaging libass for distribution, Autotools is recommended;\nwhen packaging for Windows Meson should work equally well.\n\nMeson lacks integration with testing infrastructure, but works otherwise well on\nWindows. It is suited for static-only builds on any platform well supported by\nMeson and as a Meson subproject.\nNotably, Meson supports MSVC and generation of VS project files.\n\nMacro defines\n-------------\n\nUnless developing libass there\u2019s usually",
  "github_repo": "libass/libass",
  "github_stars": 1137,
  "github_topics": [
    "advanced-substation-alpha",
    "ass",
    "c",
    "cross-platform",
    "libass",
    "ssa",
    "substation-alpha",
    "subtitle-format",
    "subtitle-formats",
    "subtitles"
  ],
  "homepage": "https://github.com/libass/libass",
  "homepage_og_description": null,
  "homepage_og_image": null,
  "homepage_title": null,
  "installs_30d": 11474,
  "installs_365d": 293549,
  "installs_90d": 48457,
  "keg_only": 0,
  "keg_only_reason": null,
  "last_seen": "2026-06-20T23:34:18+00:00",
  "license": "ISC",
  "llm_generated_at": "2026-06-20T23:44:15+00:00",
  "llm_model": "claude-haiku-4-5",
  "name": "libass",
  "oldnames": [],
  "one_liner": "C shared library for rendering ASS/SSA subtitles with advanced styling and effects support.",
  "optional_dependencies": [],
  "rank_30d": 334,
  "rank_365d": 217,
  "rank_90d": 283,
  "raw_hash": "ac872e7b53d1f25b",
  "recommended_dependencies": [],
  "revision": 1,
  "ruby_source_path": "Formula/lib/libass.rb",
  "tap": "homebrew/core",
  "test_dependencies": [],
  "uses_from_macos": [],
  "version_head": "HEAD",
  "version_stable": "0.17.4",
  "versioned_formulae": [],
  "why_use_this": "libass is the standard subtitle rendering engine for video players and tools that need to display complex subtitle formats with styling, animations, and effects. It\u0027s a build/runtime dependency for mpv, ffmpeg, and other media software; use it when you need VSFilter-compatible subtitle rendering beyond basic text overlay."
}