User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:32.0) Gecko/20100101 Firefox/32.0 (Beta/Release) Build ID: 20140607033236 Steps to reproduce: Play a video on www.weather.com. Example: http://www.weather.com/special/great-outdoors/video/is-this-heavens-gate-49424?collid=/video-minutes/great-outdoors Actual results: Black boxes appear when video starts. Once the video begins hovering the mouse pointer over the video causes it to flicker. Expected results: Video should play with no corruption.

Based on regression testing I've found that Bug 965967 is the probable cause. Turning off OMTC fixes the problem. Corruption doesn't happen on all Flash video sites. This bug might be graphic card/driver related. Good: https://hg.mozilla.org/integration/mozilla-inbound/rev/7e7061043b85 Bad : https://hg.mozilla.org/integration/mozilla-inbound/rev/ca725c15bdeb Graphics -------- Adapter Description: AMD Radeon HD 7900 Series Adapter Drivers: aticfx64 aticfx64 aticfx64 aticfx32 aticfx32 aticfx32 atiumd64 atidxx64 atidxx64 atiumdag atidxx32 atidxx32 atiumdva atiumd6a atitmm64 Adapter RAM: 3072 ClearType Parameters: 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 Direct2D Enabled: true DirectWrite Enabled: true (6.3.9600.16384) Driver Date: 5-22-2014 Driver Version: 14.200.0.0 GPU #2 Active: false GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC) Vendor ID: 0x1002 WebGL Renderer: Google Inc. -- ANGLE (AMD Radeon HD 7900 Series Direct3D9Ex vs_3_0 ps_3_0) windowLayerManagerRemote: true AzureCanvasBackend: direct2d AzureContentBackend: direct2d AzureFallbackCanvasBackend: cairo AzureSkiaAccelerated: 0

Confirming, setting OMTC to 'false' prevents the black boxes jumping around during start of video. I've not experienced this on other videos, at least none I've watched so far. Win7 x64 here Tested on m-c build cset: https://hg.mozilla.org/mozilla-central/rev/62d33e3ba514 IE11 & Chrome play video normally without any small black boxes on start-up.

Another video that also show corruption, though not as bad as on weather.com, is at cnn.com. Specifically, the video on the main page near the top left (Breaking News). Other videos appear to be OK.

I can confirm this issue on this page http://trojmiasto.tv/Stary-film-z-gdanskiego-osiedla-8477.html

Fixed by partial backout of bug 965967: https://hg.mozilla.org/integration/mozilla-inbound/rev/45eeaf4173cd

Looks fixed in latest hourly.

(In reply to Virtual_ManPL [:Virtual] from comment #6) > Looks fixed in latest hourly. What latest hourly ? An hourly from m-i ? Usually bugs are not marked 'Fixed', until it lands and sticks on m-c.

Hasn't merged to m-c yet.

Reproduced with Nightly 2014-06-07 and STR from comment 0. Verified as fixed with Firefox 32 beta 4 (Build ID: 20140804164216) on Windows 7 x64: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:32.0) Gecko/20100101 Firefox/32.0