Project overview
LosslessCut is a graphical interface for FFmpeg, primarily used for lossless operations on video, audio, and related media files. The project uses TypeScript, and its repository lists GPL-2.0 as its license.
Its core capability is trimming files through an almost direct copy of media data, avoiding re-encoding for these operations. It also supports subtitle and other track handling, segment and marker management, a command-line interface, and an HTTP API.
Use cases
- Organize large recordings from cameras, GoPros, or drones and retain useful sections.
- Trim audio or merge trimmed segments; lossless merging of whole files requires identical codecs.
- Add, remove, replace, or extract audio, subtitle, and other tracks.
- Change the container format without re-encoding, such as remuxing MKV to MP4.
- Split footage using scene, black-frame, or silence detection, or edit chapters, metadata, and rotation information.
What it does and problems it solves
LosslessCut provides graphical controls for organizing media while retaining its original encoded quality, reducing the need to re-encode files just to extract sections. It also brings track management, remuxing, snapshots, and frame export into one tool.
Preview support and export behavior are distinct: the built-in player uses Chromium and does not natively support every format and codec. Some unsupported files can use FFmpeg-assisted playback, while exports still use the original file. The README lists common formats and codecs but does not guarantee that every file can be processed successfully.
How to use
1. Open the original repository provided below this page and find its documentation section. Read Getting started first, then consult Usage documentation, the feature documentation, or the Recipe cookbook for your task.
2. Open the video or audio file in LosslessCut and choose the relevant operation, such as trimming, merging, track management, or remuxing. The README does not provide complete button locations or settings for these operations; follow the getting-started documentation available through the original repository.
3. If the file does not preview correctly, consult the README's `File` → `Convert to supported format` option. Some formats known to be unsupported automatically use FFmpeg-assisted playback; exports still use the original file.
4. Complete the export for your selected operation. For exchanging segments, chapters, or editing information, consult the documentation for chapter, CSV, EDL, and other import and export options.
5. For problems, consult the FAQ and Troubleshooting and known issues and limitations. For automation, consult the CLI or HTTP API documentation; the supplied material does not include invocation commands or parameters.
Installation
1. Find the appropriate download entry in the original repository's Download section below this page. Check supported operating systems before choosing a download. The supplied material does not list the complete system version requirements.
2. Choose a store channel or manual download listed in the README: Mac App Store for macOS, Microsoft Store for Windows, or Snap Store for Linux.
3. For manual downloads, choose the Intel or Apple Silicon DMG for your macOS device; the x64 7z file for Windows; or an x64 tar.bz2, x64 AppImage, or arm64 tar.bz2 file for Linux, according to your architecture.
4. Note that the README explicitly states that Windows APPX and macOS PKG files do not work. Windows 7, 8, and 8.1 are no longer supported after v3.50.0.
5. The supplied README excerpt does not provide complete post-download installation, extraction, or launch steps, nor source-build instructions or dependencies. After obtaining the appropriate file, consult the original repository and its documentation for further instructions; downloading the file alone does not complete installation.
Source and usage notes
- Original repository: https://github.com/mifi/lossless-cut
- Source revision: 6fc47dd4cc81b72a8f1b3132c47a99880cd9bbdb
This listing links to the upstream repository. It does not provide a verified download package, and the complete workflow has not been independently validated.
This description was organized and translated with AI from public upstream material. Refer to the original repository for capabilities, setup requirements, costs, and license terms. 
