If anyone wants to try or debug the issue, currently the way to use media engine to do the video playback is (1) apply above patches stack (bug 1778038 + bug 1771011) (2) set the pref `media.utility-process.enabled=false` (there is a bug needed to be fixed) `media.wmf.media-engine.enabled=true` `media.wmf.media-engine.video-output.enabled=true` (3) restart browser (4) go to Youtube (or any sites using MSE), then the playback would be done through the media engine.
Bug 1771011 Comment 8 Edit History
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If anyone wants to try or debug the issue, currently the way to use media engine to do the video playback is (1) apply above patches stack (bug 1778038 + bug 1771011) (2) set the pref `media.utility-process.enabled=false` (there is a bug needed to be fixed) `media.wmf.media-engine.enabled=true` `media.wmf.media-engine.video-output.enabled=true` (3) restart browser (4) run firefox with `MOZ_DISABLE_RDD_SANDBOX=1` (5) go to Youtube (or any sites using MSE), then the playback would be done through the media engine.