Changelog

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All notable changes to this project are documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

0.2.0 - 2026-06-07

Added

  • Track codec metadata — track_info/2 decodes a track's codec and media metadata into %ISOMedia.TrackInfo{}, including the RFC 6381 codec string (avc1.PPCCLL / mp4a.40.2) that streaming manifests require.
  • HLS playlists — hls_media_playlist/2, hls_master_playlist/2, and write_hls/3 generate HLS VOD .m3u8 playlists for the CMAF segments.
  • DASH MPD — dash_manifest/2 and write_dash/3 generate a static/VOD DASH .mpd (single muxed rendition, SegmentTemplate + SegmentTimeline) for the CMAF segments, via a zero-dependency XML builder.

0.1.0 - 2026-06-05

Initial release.

Added

  • Tree surgery — parse any ISOBMFF file (MP4/MOV/M4A/HEIF) into a lossless %ISOMedia.Box{} tree, navigate/edit/reorder/insert, and re-serialize byte-for-byte (serialize(parse(file)) == file).
  • faststart — move moov ahead of mdat with stco/co64 chunk-offset rewriting, including automatic stco→co64 promotion.
  • Lazy file-backed payloads — read/2 with lazy: true keeps large leaf payloads on disk as FileSlice references; write/2 streams them disk→disk so files larger than RAM can be processed.
  • Sample index + track extraction — samples/2 builds a flat [%Sample{}] per track (progressive or fragmented); extract_track/2 demuxes one track.
  • Trim — time-range, keyframe-aligned, frame-accurate (elst), interleave-preserving lossless trimming.
  • Concatenate — lossless end-to-end join of compatible clips.
  • Recursive virtual I/O — chain trim/extract_track/concat/fragment/ defragment in memory with no disk round-trip; bytes match a write+re-read between stages.
  • Fragmented MP4 — defragment/1 (fMP4 → progressive) and fragment/2 (progressive → fMP4), inverses of each other.
  • CMAF segments — split_segments/1 and write_segments/3 emit a CMAF init segment plus .m4s media segments.