We previously disabled this in bug 1163454, but we'd like to enable it again. It's believable that texture recycling will have improved this, but if not, we need to figure out why it's slow and fix it.

Omega, would you be able to test with Nightly and media.windows-media-foundation.allow-d3d11-dxva=true to see if this has improved at all? Thanks!

What a lengthy pref. I've done a quick test on today's Nightly using the reported video in the other bug. https://www.youtube.com/watch?v=mZfCkRvhkg0 Build: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:47.0) Gecko/20100101 Firefox/47.0 https://hg.mozilla.org/mozilla-central/rev/e355cacefc881ba360d412853b57e8e060e966f4 * YouTube player reports Zero Dropped Frames. No errors reported. ===================== Adapter Description AMD Radeon R9 200 Series Adapter Description (GPU #2) Intel(R) HD Graphics 4000 Adapter Drivers aticfx64 aticfx64 aticfx64 amdxc64 aticfx32 aticfx32 aticfx32 amdxc32 atiumd64 atidxx64 atidxx64 atiumdag atidxx32 atidxx32 atiumdva atiumd6a atitmm64 Adapter Drivers (GPU #2) igdumdim64 igd10iumd64 igd10iumd64 igdumdim32 igd10iumd32 igd10iumd32 Adapter RAM 3072 Adapter RAM (GPU #2) Unknown Asynchronous Pan/Zoom wheel input enabled; touch input enabled ClearType Parameters D [ Gamma: 2200 Pixel Structure: R ClearType Level: 50 Enhanced Contrast: 100 ] D [ Gamma: 2200 Pixel Structure: R ClearType Level: 100 Enhanced Contrast: 50 ] D [ Gamma: 2200 Pixel Structure: R ClearType Level: 100 Enhanced Contrast: 50 ] Device ID 0x6798 Device ID (GPU #2) 0x0162 Direct2D Enabled true DirectWrite Enabled true (10.0.10586.0) Driver Date 1-30-2016 Driver Date (GPU #2) 8-17-2015 Driver Version 15.301.1801.1001 Driver Version (GPU #2) 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I also tested with e10s both on and off. No change. Zero dropped frames.

That's very promising, thanks for testing that. This isn't the same machine (or at least GPU) as you used when you originally reported the bug though.

Its the same machine, just not the same video card. The card was a back up due to the failure of a previous card. It would take me a bit more time to reinstall it and again. But even then, It would not be the same OS since Windows 10 has been installed.

Ok, thanks for checking this Omega. I think it's worth trying this out. We now have confirmation that it'll fix bug 1236112 (for Windows 8+ users).

Comment on attachment 8719641 [details] [diff] [review] enable-d3d11-dxva Review of attachment 8719641 [details] [diff] [review]: ----------------------------------------------------------------- You could add this preference to all.js as well if you like.

Comment on attachment 8720607 [details] [diff] [review] Show D3D11 DXVA status in about:support Review of attachment 8720607 [details] [diff] [review]: ----------------------------------------------------------------- aFailureReason should be renamed into something like aExtraInfo or whatever. it's no longer a failure.

would this change be at the root of crashes like in bug 1269204 that we start seeing with 47 builds?

The code introduced in the commit for this appears to be related to bug 1298221 - from this commit onwards running Firefox with WindowBlinds enabled causes crashes in certain scenarios.