* [imagorvideo v1.1.0](https://github.com/cshum/imagorvideo) – Video thumbnail server in Go using ffmpeg C bindings to select best frames via RMSE and process images with libvips.

* [go-mp4 v1.5.0](https://github.com/abema/go-mp4) – Go library providing low-level read/write and box-level parsing/building of MP4 files.

* [node-video-lib v2.5.0](https://github.com/gkozlenko/node-video-lib) – Node.js library for parsing MP4 and FLV, building MP4 files, and muxing HLS/MPEG-TS segments.

* [mp4ff v0.51.0](https://github.com/Eyevinn/mp4ff) – Library and tools for parsing and writing fragmented and progressive MP4 files with support for multiple video, audio, subtitle, and metadata codecs.