VAAPI depends on dmabuf-video-textures - which is not finished yet (bug 1629788 comment 27). Without this patch you had to enable both prefs to use VAAPI. (Brief regressions are expected to happen on Nightly.)
Bug 1645672 Comment 7 Edit History
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VAAPI depends on dmabuf-video-textures - which is not finished yet (bug 1629788 comment 27). Without this patch you had to enable both prefs to use VAAPI. (Brief regressions are expected to happen on Nightly. Other patches still await review.)