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I got this weird sound issue on Firefox, which I've noticed on a lot of YouTube videos. Normally this happens in sound mixer:

But then, when navigating to another YouTube video this happens:

I didn't change any setting or anything – I'm confused. I should also mention that besides my main output source there is a USB headset output... if this has anything to do with my problem.

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Well, is there sound coming out of the USB headset? – Bob Jun 18 '12 at 12:38
    
nope, no sound output at all – krasatos Jun 18 '12 at 12:45
    
sometimes adobe flash player is missing from the sound mixer... so i restarted ff having my speakers as a default audio output and it seems to work... tried a couple of videos that were not working before and they work ok... so maybe it has to do with html5/flv type of videos? anyway i will test more and report back if it is still broken or if it's corrected. – krasatos Jun 18 '12 at 12:48
1  
I never have Adobe Flash Player in there at all. On another note, do you have the same issue if you remove the USB headset? Flash vs. HTML5 should not make a difference. – Bob Jun 18 '12 at 12:58
    
Do you use the latest version of Flash ? – HackToHell Jun 18 '12 at 14:16

Try turning the volume down a bit on the YouTube video from within the YouTube player (it's weird, I know, but it worked for me).

I was having the same problem - Sound worked fine for some youtube videos but not others - the sound on some videos was nonexistent or I would just hear quiet pops and crackles.

I updated Flash, disabled my old flash plugin in Firefox (tools->addons->plugins) and restarted Firefox to no avail.

Then, I turned the volume down within the YouTube player and I could hear the sound properly. I think that on some of those videos, they try altering the sound track to make them louder and it causes a glitch where the sound won't play... That's my best guess as to why this worked for me.

Good luck!

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