RESOLVED INVALID 277140
[MSE] Incorrect calculations in evictable content when using mp4 
https://bugs.webkit.org/show_bug.cgi?id=277140
Summary [MSE] Incorrect calculations in evictable content when using mp4
Jean-Yves Avenard [:jya]
Reported 2024-07-26 05:19:44 PDT
Seens in the console: ``` 024-07-26 21:39:05.863854+1000 0x4B5EF1 Default 0x0 72312 0 com.apple.WebKit.GPU.Development: (CoreMedia) [com.apple.coremedia:excessive] <<<< SampleBuffer >>>> CMSampleBufferCallForEachSample signalled err=1 (err) ([aborting loop early due to error from callback]) at FigSampleBuffer.c:5237 0 CoreMedia 0x000000019bba036c CMSampleBufferCallForEachSample + 1504 [0x19bafb000 + 676716] 1 WebCore 0x00000003029f071c _ZN3PAL55softLink_CoreMedia_CMSampleBufferCallBlockForEachSampleEP20opaqueCMSampleBufferU13block_pointerFiS1_lE + 48 [0x300000000 + 43976476] ``` To calculate how much data can be evicted from a source buffer we iterate over the samples to see which is to be ignored. It appears that `CMSampleBufferCallForEachSample` performs a speed throttling which cause the calculation to return 0 (and leading to a sync call)
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Radar WebKit Bug Importer
Comment 1 2024-07-26 05:20:01 PDT
<rdar://problem/132565283>
Jean-Yves Avenard [:jya]
Comment 2 2024-07-26 06:05:50 PDT
Pull request: https://github.com/WebKit/WebKit/pull/31290
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