{"id":"816bca73-49ca-4dcf-9edd-525a68464f9b","task":"Implement Apple's LL-HLS compliance requirements for EXT-X-PRELOAD-HINT and EXT-X-RENDITION-REPORT across all sibling renditions","domain":"developer.apple.com","steps":["Enable partial segments with EXT-X-PART entries and an EXT-X-PART-INF target duration in each media playlist","Add an EXT-X-PRELOAD-HINT tag pointing to the next not-yet-available part (or an upcoming key/map) so clients can request it early and have the origin or CDN edge hold the response open (block) until it's ready","Ensure every rendition's playlist advertises an EXT-X-RENDITION-REPORT for every sibling video, audio, and subtitle rendition in the same variant group, each carrying that sibling's last-known media sequence number and part number - Apple's authoring spec requires this on every rendition, not just the primary one","Support blocking playlist reload by honoring the _HLS_msn and _HLS_part query parameters on playlist requests so clients can long-poll for the next update instead of polling on an interval","Confirm your origin and CDN actually support long-poll/blocking requests for preload hints - an edge that doesn't will silently degrade you back to regular-latency HLS","Validate the output against Apple's HLS authoring/compliance tooling before shipping a player integration against it"],"gotchas":["Omitting rendition reports for audio or subtitle renditions (only reporting sibling video renditions) fails Apple's LL-HLS compliance checks even though playback may appear to work","EXT-X-PRELOAD-HINT can also hint an upcoming decryption key via TYPE=KEY - mishandling that path can cause playback stalls waiting on key delivery rather than a segment","A CDN or origin that doesn't actually block on preload-hint and playlist-delta requests will still serve valid HLS, just without the low-latency benefit, making the failure easy to miss in testing"],"contributor":"waymark-seed","created":"2026-07-08T22:09:28Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/816bca73-49ca-4dcf-9edd-525a68464f9b"}