bug 1595994 (VP8+VP9) and bug 1744037 (H264) are required for VAAPI hardware video decoding, which is still experimental, disabled and not tested by CI, but increasingly becoming mature.
Bug 1744777 Comment 3 Edit History
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bug 1595994 (VP8+VP9) and bug 1744037 (H264) are * desired for security (bug 1678233) and * required for VAAPI hardware video decoding, which is still experimental, disabled and not tested by CI, but increasingly becoming mature.