I have this with VP9 on an XPS 15 with `Mesa Intel(R) UHD Graphics (CML GT2)`. As a wild guess, it looks like the GPU is consuming truncated encoded frames, so it might be there's some missing fencing/synchronization and the GPU tries to read the encoded frames before they're properly transferred, or missing cache invalidation.
Bug 1770407 Comment 8 Edit History
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I have this with VP9 on an XPS 15 with `Mesa Intel(R) UHD Graphics (CML GT2)`. As a wild guess, it looks like the GPU is decoding truncated frames, so it might be there's some missing fencing/synchronization and the GPU tries to read the encoded frames before they're properly transferred, or missing cache invalidation.