Created attachment 8850882 [details] about:suppot [Tracking Requested - why for this release]: HTML5 video does not play properly when e10s is disabled The problem only happens if e10s is disabled Steps To Reproduce: 1. Make sure e10s is disabled 2. Open e.g, https://videos.cdn.mozilla.net/uploads/mozillaorg/A%20different%20kind%20of%20browser.mp4 Actual Results: Video is black. Audio seems to have no problem. Regression window: https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=706d07027f02713274e0246df2eb4e472fc67efd&tochange=45a0933af0d661ef4e6aad33eb3c9d98c62eaef6 Regressed by Bug 1343814
(And if not reproduce, it may need to set media.hardware-video-decoding.enabled=false in order to simulate hardware H 264 decoding blocked)
Tracking 55+ for this regression.
Created attachment 8851316 [details] [diff] [review] fix Very dumb bug, I never set mProvider.
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/mozilla-inbound/rev/1275406f631b Fix DXGIYCbCrTextureHost not setting a TextureSourceProvider. (bug 1350251, r=mattwoodrow)
I have managed to reproduce this issue by following the steps mentioned in comment 0 and comment 1 using Firefox 55.0a1 (Build Id:20170324030205) on Windows 10 64bit. This issue is verified fixed on Firefox 55.0b3 (BuildId:20170619071723) using Windows 10 64bit, Ubuntu 16.04 64bit, macOS 10.11.6 and Windows 7 32bit.