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Description of problem: When I look at a webm video in firefox (try youtube or : http://dev.opera.com/articles/view/opera-supports-webm-video/custom-controls-webm-720p.html) The sound is realy strange. Character voice is replaced by robot voice, and I often hear music unrealted to the video I'm watching. Version-Release number of selected component (if applicable): Don't know, last full yum update 20/january/2012 How reproducible: Depends on the video and the timecode Always messed up at the same times for the same video Steps to Reproduce: 1. firefox 2. http://dev.opera.com/articles/view/opera-supports-webm-video/custom-controls-webm-720p.html 3. play & hear
Same bug in vlc: vlc http://lachy.id.au/lib/media/elephantsdream/Elephants_Dream-720p-Stereo.webm watch the video until the man speaks after the wire attack.
May be related to : https://bugs.launchpad.net/ubuntu/+source/adobe-flashplugin/+bug/750129
I'm experimenting this bug with other format (like subsonic web streamed MP3). Sound is relay strange : the begining of the track is mixed with other parts, the voices are sometimes hard to hear when the music looks untouched...
I cannot reproduce any oddness on my box. It plays and sounds as expected here. $ rpm -q xulrunner firefox xulrunner-10.0-1.fc16.x86_64 firefox-10.0-1.fc16.x86_64
Maybe my sound card is broken. I don't have any other OS on this computer to test if it's a hardware failure.
If the issue is reproducible with vlc, it has nothing to do with firefox. I suspect pulseaudio may be the first culprint, maybe audio-drivers? Or broken mixer settings? Try to install alsa-utils and run alsamixer, it allows you to modify soundcard volumes.
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