Firefox playing flash movie doesn't show up in Ubuntu 9.10 Sound Preferences

Question

I have just upgraded from Ubuntu 9.04 to 9.10. The sound is working fine for:

1. On disk Movies(*.avi, *.flv)
2. Music(*.mp3)

I'm currently watching youtube or other flash movies on Firefox 3.5.7 which play fine but there is no sound at all. Whenever I listen to music or watch a movie, the media software that I use will show up under the Applications tab of Sound Preferences which can be accessed through System -> Preferences -> Sound.

For instance, Rhythmbox shows up if I am listening to music. When I watch youtube on Firefox or Chrome, nothing shows up under the Applications tab. Does anyone know how to fix this issue? I believe that once this issue is fixed, my flash videos through a web browser will have sound again.

Answer 1

Try this solution: https://launchpad.net/ubuntu/+source/flashplugin-nonfree/+bug/29760

Answer 2

I think it might be a permission issue. Just make sure root and your username(using jdoe as example) is associated with the following groups in /etc/group:

audio:x:29:jdoe,pulse
pulse:x:121:root,jdoe
pulse-access:x:122:root,jdoe

I guess you could also do the following from the Users and Groups GUI but I just can't find it on my OS(another issue to fix).