Bug 270645 – [Cocoa] WebCodecs HEVC decoder is not always reordering frames according presentation time

• Component: Media
• Status: RESOLVED FIXED

[Marcello Bastea-Forte]

Related: https://bugs.webkit.org/show_bug.cgi?id=268987, maybe followup for https://bugs.webkit.org/show_bug.cgi?id=265389 ?

The h265/HEVC test file on the webcodecs sample is returning decoded frames out of order:

Full repro steps:
- pull the code:
  - either from https://github.com/marcello3d/webcodecs/tree/marcello/frame-out-of-order-logging
  - apply the patch yourself to https://github.com/w3c/webcodecs https://patch-diff.githubusercontent.com/raw/w3c/webcodecs/pull/734.patch
- run the server with `node server` in the samples folder
- open http://localhost:8888/ in safari
- open developer console to see javascript logs
- Leave renderer at 2D and select H.265 video codec
- click start

Result:
- 4 frames decoded then, Error: Decoded frame 166666 µs out of order, last frame was 200000 µs

Expected:
- it decodes the whole file

[youenn fablet]

Should be fixed after https://commits.webkit.org/275434@main

*** This bug has been marked as a duplicate of bug 270096 ***

[Marcello Bastea-Forte]

awesome, I guess that missed the STP 190 cutoff, I'll test in 191! Do you have a sense of when this fix would make it to end-users?

[Marcello Bastea-Forte]

This is still broken for me (same error from test in first comment) in Safari Technology Preview Release 192 (Safari 17.4, WebKit 19619.1.8.1)

[Marcello Bastea-Forte]

(on macOS 14.3.1 (23D60))

[Radar WebKit Bug Importer]

<rdar://problem/127655559>

[youenn fablet]

I can reproduce the issue, our VPS reading routine might need to cover more cases.

[EWS]

Committed 278462@main (1fb6c8c6fa42): <https://commits.webkit.org/278462@main>

Reviewed commits have been landed. Closing PR #28231 and removing active labels.