brew / rank 5168

Install alass with Homebrew, scoop

Automatic Language-Agnostic Subtitle Synchronization. Version 2.0.0 via Homebrew; verified from local package data. Also installable with scoop: scoop install main/alass.

Install command Security notes

install

Additional install commands

macOS

Homebrewverified · 100%

brew install alass

local Homebrew formula metadata

Windows

Scoopverified · 92%

scoop install main/alass

Scoop official bucket manifest trees · bucket/alass.json · source: api.github.com

overview

Package summary

Automatic Language-Agnostic Subtitle Synchronization

Project links

Homepage

Commands and aliases

alass-cli

history

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

https://api.github.com/repos/kaegi/alass
https://github.com/kaegi/alass
input source_facts.package-manager

security posture

Risk level: blue

broad file, network, media, or database tool signal.

Risk classifier

blue risk · medium confidence · tool

Why

broad file, network, media, or database tool signal

Signals

text:sync

Install behavior

No Homebrew bottle metadata was recorded.

Recommended review

Before unattended agent use, check whether the tool reads plaintext credentials, writes remote state, publishes artifacts, or shells out to plugins.

executables

Installed executables

Command	Kind	Exposure	Note
`alass-cli`	executable	indexed executable	Discovered from the local executable index.

freshness

Version and freshness

These signals separate page generation age, package-manager activity, and upstream release comparison. Version lag is warned only when an evidence URL and comparable versions are present.

page generated2026-08-03

manager version2.0.0

manager updated

local dataunknown

upstreamnot available

latest detectednot detected

okNo freshness warnings were generated.

install metadata

Package metadata

Package key	brew:alass
Version	2.0.0
Package manager	Homebrew
Homepage	https://github.com/kaegi/alass
Repository	https://github.com/kaegi/alass
Bottle	not recorded
Service	none declared

source database matches

Other package-manager records

Matches are pulled from external package-manager indexes and kept separate from local Automic Vault package links.

Scoop95%

main/alass

scoop install main/alass

normalized package name match
Matched by: Alass

Scoop official bucket manifest trees · api.github.com · Scoop official bucket manifest trees: bucket/alass.json from https://api.github.com/repos/ScoopInstaller/Main/git/trees/master?recursive=1

source trail

Generated from repository data

This page is generated by av-web from the private package SQLite artifact built by scripts/generate-pkg-sqlite.py.

Combined YAML source

View the package source record on GitHub.

combined/alass.yml

Used sources

Geiger risk classifier
cross-ecosystem install command graph
curated package history
external package-manager database matches
pkg.so package database
pkgdb category and tag curation