A Go library and toolkit for parsing, creating, and manipulating MP4 files, with a focus on fragmented formats used for streaming.
mp4ff is a Go library and toolkit for parsing, creating, and manipulating MP4 media files. It focuses on fragmented MP4 formats used for streaming in protocols like MPEG-DASH, HLS fMP4, and MSS, while also supporting progressive MP4 files. The library handles video (AVC, HEVC, AV1, VVC), audio (AAC, AC-3, Opus), subtitles, and timed metadata tracks.
Developers and engineers working on video streaming pipelines, media processing tools, or applications that need to generate, parse, or manipulate MP4 files, especially for adaptive bitrate streaming.
mp4ff provides a comprehensive, performance-optimized, and streaming-focused MP4 implementation in Go, with extensive codec support, command-line utilities, and both high-level and low-level APIs for flexibility.
Library and tools for working with MP4 files containing video, audio, subtitles, or metadata. The focus is on fragmented files. Includes mp4ff-info, mp4ff-encrypt, mp4ff-decrypt and other tools.
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Supports a wide range of video (AVC, HEVC, AV1, VVC), audio (AAC, AC-3, Opus), and subtitle (WebVTT, TTML) codecs, including emerging standards, as detailed in the codec table in the README.
Optimized for fragmented MP4 files used in streaming protocols like MPEG-DASH and HLS fMP4, with dedicated structures for init segments and media segments, making it ideal for adaptive bitrate streaming workflows.
Implements lazy decoding/writing of mdat data and SliceReader/SliceWriter interfaces to reduce memory allocations, with benchmarks showing significant improvements in speed and efficiency compared to older versions.
Includes command-line utilities for common tasks such as encryption (mp4ff-encrypt), cropping (mp4ff-crop), and codec analysis (mp4ff-nallister), which enhance practicality for real-world media processing.
The README explicitly warns that 'minor non-backwards-compatible changes may happen until version 1,' posing risks for production systems that require stable dependencies.
Requires deep understanding of MP4 box structures and ISOBMFF standards; the README notes that direct attribute changes can lead to inconsistencies and panics, increasing development overhead.
As a Go-only library, it cannot be easily integrated into projects using other languages without creating custom bindings or services, limiting its use in polyglot environments.