FWIW, you mention that you wait for canplay before trying to use the video. That's not necessarily waiting long enough. You want to `await video.play();` to make sure that webgl will find data to upload: https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/play I can repro a blank frame at the stage where "skip intro" appears (with the young man typing on the keyboard). A brief flash of black for that video appeared, and I see in console: > WebGL warning: tex(Sub)Image[23]D: Failed to retrieve source bytes for CPU upload. (23 repeats) That's from here: https://searchfox.org/mozilla-central/source/dom/canvas/ClientWebGLContext.cpp#4314
Bug 1698054 Comment 4 Edit History
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FWIW, you mention that you wait for canplay before trying to use the video. That's not necessarily waiting long enough. You want to `await video.play();` to make sure that webgl will find data to upload: https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/play --- I can repro a blank frame at the stage where "skip intro" appears (with the young man typing on the keyboard). A brief flash of black for that video appeared, and I see in console: > WebGL warning: tex(Sub)Image[23]D: Failed to retrieve source bytes for CPU upload. (23 repeats) That's from here: https://searchfox.org/mozilla-central/source/dom/canvas/ClientWebGLContext.cpp#4314