FF Nightly (tested with 116 and 117) on Linux does not support WebM VP8/VP9 video, when attempting to play such a video the user is presented with `No video with supported format and MIME type found` on screen and the following on _stderr_: ``` [Child 244810, MediaDecoderStateMachine #1] WARNING: Decoder=7fd727e9aa00 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /builds/worker/checkouts/gecko/dom/media/MediaDecoderStateMachine.cpp:372 [Child 244810, MediaDecoderStateMachine #1] WARNING: Decoder=7fd727e9aa00 Decode error: NS_ERROR_DOM_MEDIA_METADATA_ERR (0x806e0006): file /builds/worker/checkouts/gecko/dom/media/MediaDecoderStateMachineBase.cpp:166 ``` How to reproduce: using FF Nightly 116/117 on Linux, open a WebM video and watch it fail: https://base-n.de/webm/out9.webm Another way to show the missing WebM support is to open the HTML5 test site (https://html5test.com/) and notice the failing video support (WebM Vorbis and Opus audio work, only VP8/VP9 video are failing).
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FF Nightly (tested with 116 and 117) on Linux does not support WebM VP8/VP9 video, when attempting to play such a video the user is presented with `No video with supported format and MIME type found` on screen and the following on _stderr_: ``` [Child 244810, MediaDecoderStateMachine #1] WARNING: Decoder=7fd727e9aa00 state=DECODING_METADATA Decode metadata failed, shutting down decoder: file /builds/worker/checkouts/gecko/dom/media/MediaDecoderStateMachine.cpp:372 [Child 244810, MediaDecoderStateMachine #1] WARNING: Decoder=7fd727e9aa00 Decode error: NS_ERROR_DOM_MEDIA_METADATA_ERR (0x806e0006): file /builds/worker/checkouts/gecko/dom/media/MediaDecoderStateMachineBase.cpp:166 ``` How to reproduce: using FF Nightly 116/117 on Linux, open a WebM video and watch it fail: https://base-n.de/webm/out9.webm Another way to show the missing WebM support is to open the HTML5 test site (https://html5test.com/) and notice the failing video support (WebM Vorbis and Opus audio work, only VP8/VP9 video are failing). Bug was discovered while testing Invidious (https://github.com/iv-org/invidious/issues/3966)