I had the same issue. I was playing some flash-videos in Firefox and when I switched to another, the video suddenly was about 4 times faster and it looked like it was skipping frames. There was no sound, too. While debugging the problem I tried local media files (h264, mp3, ...) and same effect. So I thought it could be gstreamer. gstreamer- properties did not run the audio-test. So I looked up my audio-settings and it turns out that for some reason the output-audio device suddenly changed from my analog-device to HDMI-device from my graphics-card. Switching back to my primary audio-device solved the problem.
Ubuntu 10.10 amd64 about:config: Shockwave Flash 10.3 d162 $ lspci|grep Audio 00:1b.0 Audio device: Intel Corporation 82801JI (ICH10 Family) HD Audio Controller 01:00.1 Audio device: ATI Technologies Inc RV710/730 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/630134 Title: video plays much too fast -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs