NEW216478
image.decode() promise does not resolve or reject on some <img src=mp4> 
https://bugs.webkit.org/show_bug.cgi?id=216478
Summary image.decode() promise does not resolve or reject on some <img src=mp4>
Colin Bendell
Reported 2020-09-14 05:52:54 PDT
image.decode() promise does not resolve nor reject on some resources. Valid <img src=mp4> with hvc1 encoded payloads no longer resolve or reject in latest macOS, iOS betas and Tech Preview (regression). This might be related to bug 216088. Additionally, <img src=mp4> with av1 byte streams also do not resolve nor reject but this is pre-existing in all versions of Safari. const img = new Image(); img.src = "hvc1.mp4"; document.body.appendChild(img); // will not return await img.decode(); You can see this tested here: https://colinbendell.github.io/webperf/img-decode-promise/ (NB: the above wpt test may yield some false-negatives due to github latencies and the aggressive timeouts)
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Alexey Proskuryakov
Comment 1 2020-09-14 18:42:23 PDT
Not sure if this is actionable with bug 216088 fixed. I see one failure on this test, but it's the same as in shipping Safari, and Chrome has more failures. Do you have a test that passes in shipping Safari, and fails with a trunk WebKit build?
Colin Bendell
Comment 2 2020-09-15 05:20:21 PDT
The image.decode() failure for <img src=av1.mp4> does pre-exist. While that part is not a regression is a bug. Any invalid or unsupported mp4s will fail to Promise.reject() The other image.decode() failures on valid/supported mp4 containers appears to be resolved. Should I open a new bug? Or rename this one?
Alexey Proskuryakov
Comment 3 2020-09-15 18:09:34 PDT
Thank you for the confirmation, removed REGRESSION from the title.
Radar WebKit Bug Importer
Comment 4 2020-09-15 18:09:43 PDT
<rdar://problem/68954377>
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