3 would only show a big 'X' - no errors, nothing. I think it should work fine with both gstreamer versions, 0. I've been having a nightmare with both Chrome and Firefox where 60fps videos are either causing way too much CPU usage and lagging, or like I show here where. I have the exact same problem as gravytrain, they play but keep stuttering in this very weird manner where the playback will slowly start to get slower then it'll stutter, but the sound continues on like nothing happened. This is a major feature, over a year in the making, that makes Firefox smoother and less laggy. Mozilla has released Firefox 37, bringing native playback of HTML5 video for Windows, and many security changes. The WebM videos are of much higher quality, but I get weird behaviour with freezing picture and stuttering sound in almost every video.
Html5 stuttering firefox Windows 7 ultimate 64-bit.
