Package content into CMAF for simultaneous HLS and DASH delivery from one asset
domain: cmaf · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Encode video to fMP4 with a fixed GOP aligned to your segment duration; audio must be in fMP4 AAC containers, not MPEG-TS
Use a packager (Shaka Packager, Bento4, or Unified Streaming) to fragment the fMP4 into CMAF chunks with a common segment duration and shared encryption keys
Generate both an HLS multivariant playlist (referencing .mp4 segments) and a DASH MPD pointing to the same CMAF segments; update EXT-X-VERSION to 7+ for fMP4 HLS
Set the Content-Type header to 'video/mp4' for fMP4 segment responses; using 'video/MP2T' will cause HLS clients to misparse the segments
Verify DRM interoperability by testing a CMAF-encrypted stream with both a Widevine player and a FairPlay player against the same encrypted segments
Known gotchas
CMAF requires 'brand' compatibility: the fMP4 file must include 'cmf2' or 'cmfc' in its compatible_brands list, or strict CMAF validators will reject it
Chunked transfer encoding at the CDN layer is required for LL-DASH and LL-HLS CMAF delivery; standard CDNs that buffer the full segment before forwarding negate the latency benefit
Mixing MPEG-TS and fMP4 representations in the same HLS playlist is not permitted by the spec and causes Safari to fail silently
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