This video is too large which Media Foundation and D3D11 decoder both don't support, (max resolution support for WMF H264 is 4096). Chrome falls back to using the ffmpeg decoder. Due to the patent issue, we can't do that.
Bug 1946068 Comment 16 Edit History
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This video is larger than Media Foundation and D3D11 decoder support, (max resolution support for WMF H264 is 4096). Chrome falls back to using the ffmpeg decoder. Due to the patent issue, we can't do that.