under firefox, if I set youtube to use the html5 video player or if i try to watch something on vimeo, I can't hear anything, but I can hear the sound of the video if I use the flash video player on youtube.
When I play an html5 video, I can see in pulseaudio the sound stream called CubebUtils with firefox logo under the "applications" tab, and the volume is set to 100%, but I can't hear anything. The same thing occurs with chromium: I see in pulseaudio the chromium stream, I see the video, but I can't hear anything. I can hear the sound from any other application (vlc, system sounds, flash player, etc...)
Any ideas ? Thanks