296928 2025-08-05 04:39:54 -0700 [GStreamer] http/wpt/mediarecorder/mute-tracks.html is failing 2025-08-05 04:40:36 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified NEW P2 Normal --- 213699 1 dpino webkit-unassigned philn oldest_to_newest 2134375 0 dpino 2025-08-05 04:39:54 -0700 The tests fails with the following output: [GTK] https://build.webkit.org/results/GTK-Linux-64-bit-Release-Tests/298225%40main%20%2820820%29/http/wpt/mediarecorder/mute-tracks-diff.txt --- /home/buildbot/worker/GTK-Linux-64-bit-Release-Tests/build/layout-test-results/http/wpt/mediarecorder/mute-tracks-expected.txt +++ /home/buildbot/worker/GTK-Linux-64-bit-Release-Tests/build/layout-test-results/http/wpt/mediarecorder/mute-tracks-actual.txt @@ -1,6 +1,6 @@ PASS Recording a muted audio track should produce silence -PASS Muting an audio track should record silence +FAIL Muting an audio track should record silence promise_test: Unhandled rejection with value: object "NotSupportedError: The operation is not supported." PASS Muting a video track should produce black frames [WPE] https://build.webkit.org/results/WPE-Linux-64-bit-Release-Tests/298225%40main%20%2822215%29/http/wpt/mediarecorder/mute-tracks-diff.txt --- /home/buildbot/worker/WPE-Linux-64-bit-Release-Tests/build/layout-test-results/http/wpt/mediarecorder/mute-tracks-expected.txt +++ /home/buildbot/worker/WPE-Linux-64-bit-Release-Tests/build/layout-test-results/http/wpt/mediarecorder/mute-tracks-actual.txt @@ -1,6 +1,9 @@ +CONSOLE MESSAGE: A capture MediaStreamTrack was destroyed without having been stopped explicitly +CONSOLE MESSAGE: A capture MediaStreamTrack was destroyed without having been stopped explicitly +CONSOLE MESSAGE: A capture MediaStreamTrack was destroyed without having been stopped explicitly PASS Recording a muted audio track should produce silence -PASS Muting an audio track should record silence +FAIL Muting an audio track should record silence promise_test: Unhandled rejection with value: object "NotSupportedError: The operation is not supported." PASS Muting a video track should produce black frames I suspect the error happens at this line: https://github.com/WebKit/WebKit/blob/main/Source/WebCore/html/HTMLMediaElement.cpp#L4360, that means it happens on calling `video2.play()`.