Well, now I understand Vortex's predicament and I would have to say it is the same with me. If I have a multimedia file playing on Chromium, I won't be able to use multimedia apps like Bangarang or VLC until I close the browser tab because the apps won't be able to play the audio.
It's the same when I am playing something on VLC and open a YouTube video. It's not a problem for me because I don't really want to watch and listen to multiple AV at the same time. Also this issue is not related to the OP which is OGV.