Package mp4ff implements MP4 media file parsing and writing for AVC and HEVC video, AAC and AC-3 audio, and stpp and wvtt subtitles. It is focused on fragmented files as used for streaming in DASH, MSS and HLS fMP4, but can also decode and encode all boxes needed for progressive MP4 files. In particular, the tool mp4ff-crop can be used to crop a progressive file.

WWW: https://github.com/Eyevinn/mp4ff
