# Install alass with Homebrew, scoop Automatic Language-Agnostic Subtitle Synchronization. Version 2.0.0 via Homebrew; verified from local package data. ## Install ```sh sudo av install brew:alass ``` Additional install commands: ### macOS - Homebrew (100%): ```sh brew install alass ``` Evidence: local Homebrew formula metadata ### Windows - Scoop (92%): ```sh scoop install main/alass ``` Evidence: Scoop official bucket manifest trees: bucket/alass.json from https://api.github.com/repos/ScoopInstaller/Main/git/trees/master?recursive=1 ## Package facts - **Package key:** brew:alass - **Package manager:** Homebrew - **Package manager page:** - **Version:** 2.0.0 - **Source summary:** Automatic Language-Agnostic Subtitle Synchronization - **Homepage:** - **Repository:** - **Upstream docs:** - **License:** GPL-3.0-or-later - **Source archive:** - **Generated:** 2026-07-08T07:18:31+00:00 ## Executables - alass-cli (cli) - alass-cli (alias) ## Build dependencies - rust ## Install behavior - Post-install hook: not defined - Bottle: available on arm64_big_sur, arm64_linux, arm64_monterey, arm64_sequoia, arm64_sonoma, arm64_tahoe, arm64_ventura, big_sur, monterey, sonoma, ventura, x86_64_linux ## Freshness - Page generated: 2026-07-08 - Package-manager version: 2.0.0 - Local data: ok - Upstream repository: https://github.com/kaegi/alass - Upstream latest detected: v2.0.0 (current) - info: No package-manager update timestamp was available. ## Project history and usage alass is a Rust command-line tool for Automatic Language-Agnostic Subtitle Synchronization. It aligns subtitle timing to a movie or to another subtitle file, correcting offsets, splits, and framerate differences without depending on the spoken language. ### Project history The public GitHub repository was created in February 2017. The README ties the algorithmic basis to the author's bachelor's thesis and presentation, and notes that the program was previously called `aligner` before being renamed to `alass` because the old name was hard to find in search engines. The workspace is split into `alass-core`, the reusable algorithm library, and `alass-cli`, the official command-line tool for end users. That split lets downstream code reuse the synchronization algorithm while package managers expose the practical CLI. ### Adoption history Official releases provide Windows and Linux executables, while source builds use Rust and Cargo. The supplied package-manager facts show distribution through Homebrew as `alass` and Scoop as `main/alass`. The tool's adoption sits in the media-maintenance niche: users with mismatched subtitle files, different cuts, advertisement breaks, or framerate drift can run a local binary instead of manually editing subtitle timestamps. ### How it is used Basic use is `alass movie.mp4 incorrect_subtitle.srt output.srt`, or using a reference subtitle instead of a video file. For video references, `ffmpeg` and `ffprobe` are used to extract audio, with paths overridable through `ALASS_FFMPEG_PATH` and `ALASS_FFPROBE_PATH`. The README documents tuning with `--split-penalty` and a faster `--no-splits` mode when only a constant shift is desired. Supported subtitle formats include `.srt`, `.ssa`, `.ass`, and `.idx`, while common video formats are supported through FFmpeg. ### Why package nerds care alass is a neat package-manager specimen because it wraps a specialized media algorithm into a normal CLI install. The package saves users from compiling a Rust workspace and C voice-activity component just to fix one badly timed subtitle file. It also shows the recurring package-manager pattern where the executable name differs from the crate/workspace internals: Homebrew users get `alass-cli`, while the human-facing project name remains simply `alass`. ### Timeline - 2017: Public GitHub repository created. - Initial project period: README documents the bachelor's thesis and presentation behind the algorithm. - Later: Project renamed from `aligner` to `alass` for searchability. - 2023: Repository metadata shows continued activity into late 2023. ### Related projects - alass-core: reusable library crate containing the synchronization algorithm. - alass-cli: official command-line tool for end users. - FFmpeg and ffprobe: external tools used by alass to extract audio from video references. ### Sources - - - input source_facts.package-manager ## Security Notes broad file, network, media, or database tool signal. - **Geiger risk:** blue / medium - broad file, network, media, or database tool signal ## Source Database Details - **Source Database:** Homebrew formula API - **Tap:** homebrew/core - **Full Name:** alass - **Version Scheme:** 0 - **Revision:** 0 - **Bottle Stable Root URL:** - **Deprecated:** no - **Disabled:** no - **Keg Only:** no - **URL Keys:** stable ## Other Package-Manager Records - Scoop - main/alass: normalized package name match | Scoop official bucket manifest trees: bucket/alass.json from https://api.github.com/repos/ScoopInstaller/Main/git/trees/master?recursive=1 ## Related links - [Source-control packages](https://www.automicvault.com/pkg/source-control-tools/) - Belongs to a source-control command family. - [Secret-risk packages](https://www.automicvault.com/pkg/secret-risk-packages/) - Has protected-tool coverage, approval-gate, or non-low Geiger security signals. - [Terminal utility packages](https://www.automicvault.com/pkg/terminal-utilities/) - Matched terminal and command-line workflow metadata. - [Language runtime packages](https://www.automicvault.com/pkg/language-runtime-packages/) - Matched language runtime, compiler, or interpreter metadata. - [rust](https://www.automicvault.com/pkg/brew/rust/) - Build dependency declared by Homebrew. - [ccextractor](https://www.automicvault.com/pkg/brew/ccextractor/) - Shares av.db curated category or tags: cli, media, subtitles, video. - [moribito](https://www.automicvault.com/pkg/brew/moribito/) - Shares av.db curated category or tags: cli, media, subtitles, video. - [sub2srt](https://www.automicvault.com/pkg/brew/sub2srt/) - Shares av.db curated category or tags: cli, media, subtitles. - [subliminal](https://www.automicvault.com/pkg/brew/subliminal/) - Shares av.db curated category or tags: cli, media, subtitles. - [mpv](https://www.automicvault.com/pkg/brew/mpv/) - Shares av.db curated category or tags: cli, media, subtitles, video. - [ab-av1](https://www.automicvault.com/pkg/brew/ab-av1/) - Shares av.db curated category or tags: cli, media, video. - [aom](https://www.automicvault.com/pkg/brew/aom/) - Shares av.db curated category or tags: cli, media, video. - [auto-editor](https://www.automicvault.com/pkg/brew/auto-editor/) - Shares av.db curated category or tags: cli, media, video. - [av1an](https://www.automicvault.com/pkg/brew/av1an/) - Both packages work with overlapping file formats or content types. Shared terms: cli, media, video. ## Combined YAML source View the package source record on GitHub. [combined/alass.yml](https://github.com/automic-vault/db/blob/main/combined/alass.yml) ## Sources - Nucleus package database - Geiger risk classifier - package-page enrichment - curated package history - package version freshness - av.db category and tag curation - package relationship graph - external package-manager database matches - cross-ecosystem install command graph