Don't let latency ruin your longtail: an introduction to "dref MP4" caching
summary
Proposes creating a tiny, spec‑compliant dref MP4 that contains the moov box sample tables but no media, caching it between JIT packager and remote storage so the packager reads indexes locally instead of fetching whole files. Tests with Unified Origin show MPD generation ~70× faster, segment packaging ~1.5× faster and packager throughput +10–20%. The artifact is tens of megabytes for gigabyte sources and demonstrably reduces long‑tail startup latency.
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chapters (6)
- 0:00Introduction to JIT latency
- 1:23The role of MP4 indexes
- 2:55Impact on long-tail content
- 4:43Introducing drafmp4 caching
- 7:13Performance benefits
- 9:24Additional drafmp4 use cases
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