5.24 MB, video/ogg
(sorry for ugly title, feel free to correct it more understandable) I can reproduce by following these steps: 1) Use new profile and set these preferences in about:config : layers.acceleration.force-enabled to true layers.force-active to true browser.tabs.remote.autostart.2 to false 2) Restart to apply new prefs, make sure in about:support that hardware acceleration is activated, e10s is disabled. 3) Navigate to any youtube video to watch it and (optionally) open another one in background Actual results Instead of normal video playback there will be either irrelevant frames flashing during playback or it will be even cycled sequence of frames (from begining of video) in loop. Audio is OK Expected results Normal playback Additional Used Mozregression - last GOOD - 9 July 2016, first BAD - 10 July 2016. Still broken with latest Nightly (9 august 2016). Sometimes video playing normally, sometimes it may play OK right after browser start, but usually it breaks very quickly, tends to break after opening video in background tab or just after some time. In my Mozregression test its usually broken right from the start. Problem exists with all HTML5 video on any host, not only youtube, format (MP4 or WebM) doesnt matter, MSE or not doesnt matter. Problem encountered on Xubuntu 16.04 (64 bit), used Nvidia GTX 750, Driver version NVIDIA 361.42, OpenGL 4.5.0
Additional info - tested on latest Aurora build (2016-08-10, 50a2) with same conditions - bug is present too.
Created attachment 8779862 [details] Screencast showing actual corrupted video playback I made a short screencast to illustrate that exactly "broken video" i see on Youtube. Hope it helps.
@reporter Could you attach "Graphics" section of about:support ?
(In reply to Alice0775 White from comment #3) > @reporter > Could you attach "Graphics" section of about:support ? Sure thing Features Compositing OpenGL Asynchronous Pan/Zoom none WebGL Renderer NVIDIA Corporation -- GeForce GTX 750 Ti/PCIe/SSE2 WebGL2 Renderer NVIDIA Corporation -- GeForce GTX 750 Ti/PCIe/SSE2 Hardware H264 Decoding No Audio Backend pulse GPU #1 Active Yes Description NVIDIA Corporation -- GeForce GTX 750 Ti/PCIe/SSE2 Vendor ID NVIDIA Corporation Device ID GeForce GTX 750 Ti/PCIe/SSE2 Driver Version 4.5.0 NVIDIA 361.42 Diagnostics AzureCanvasAccelerated 0 AzureCanvasBackend skia AzureContentBackend cairo AzureFallbackCanvasBackend none CairoUseXRender 0 Decision Log HW_COMPOSITING blocked by default: Acceleration blocked by platform force_enabled by user: Force-enabled by pref OPENGL_COMPOSITING force_enabled by user: Force-enabled by pref
As for latest Nightly this issue no longer appears, so i guess its fixed by some other changes.