269897 2024-02-21 22:40:06 -0800 [MSE] NotSupportedError: The operation is not supported. 2024-02-21 22:40:14 -0800 1 1 1 Unclassified WebKit Media WebKit Nightly Build Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=232125 InRadar P2 Normal --- 1 jean-yves.avenard jean-yves.avenard webkit-bug-importer oldest_to_newest 2015978 0 jean-yves.avenard 2024-02-21 22:40:06 -0800 In the test added in bug 232125 media/media-source/media-managedmse-poster.html It fails on EWS simulator bots with : ``` RUN(sourceBuffer = source.addSourceBuffer(loader.type())) NotSupportedError: The operation is not supported. RUN(sourceBuffer.appendBuffer(loader.initSegment())) EVENT(update) ``` it appears that mime type `"video/mp4; codecs=\"avc1.4d281e\""` on the simulator is rejected somehow. The test works in a local build with iOS 17.4 simulator. To be investigated. 2015979 1 webkit-bug-importer 2024-02-21 22:40:14 -0800 <rdar://problem/123424407>