https://chromium.googlesource.com/chromium/blink.git/+/master/Source/core/html/HTMLMediaElement.cpp
https://chromium.googlesource.com/chromium/blink.git/+/master/Source/core/html/HTMLMediaElement.cpp
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av1 / vp9 bitstream analyser: https://people.xiph.org/~mbebenita/analyzer/
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av1 decoder: https://github.com/GoogleChromeLabs/wasm-av1
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webm/ ogg/ theora/ vorbis / vp8 / vp9 (in wasm) https://github.com/brion/ogv.js