Description of problem: The new Firefox 43 build that was released today crashes when trying to display HTML 5 video. The previous Firefox 42 build (as of yesterday) was fine. Version-Release number of selected component (if applicable): 43.0-1.fc22 How reproducible: Always Steps to Reproduce: 1. Go to https://www.google.com/?gws_rd=ssl#q=html+5+video+test 2. All links with HTML 5 video crash the browser Actual results: The browser crashes. Expected results: The browser should not crash and display HTML 5 video. Additional info: Not sure whether the problem is upstream or a problem with the build. If you go to the URL http://youtube.com/html5 you can see whether your browser is set up for HTML 5. Notably, mine is. Youtube does not crash the browser. It attempts to play HTML 5 video but then falls back to Flash.
This does appear to be a problem with the Fedora 22 build. If you use Mozilla's x86_64 Firefox 43.0 build with the same profile, the following page not only loads but the bottom two videos play fine. http://www.quirksmode.org/html5/tests/video.html The H.264/MP4 video does not play for me but that is probably a separate issue. Interestingly, Youtube HTML 5 playback with Firefox 43.0 appears to be broken for both builds.
Normally, if you go to the URL https://www.youtube.com/html5 You want to have everything checked. It looks like the regression with Firefox 43 was with the setting MSE & H.264 In order to turn this specific setting off, you need to adjust the about:config setting media.fragmented-mp4.enabled and set it to false. With this setting disabled HTML5 video playback seems stable again.
Can you please test this package? http://koji.fedoraproject.org/koji/buildinfo?buildID=708766
I have re-enabled media.fragmented-mp4.enabled and this new release looks good to me. No crashes. Thanks for your hard work. John
Okay, Thanks.