No sound in YouTube, Vimeo, Hulu, or VLC with OSX Lion; iTunes and system sounds are fine

same problem here with a mid2010 macbook pro.....

the funny thing is, there are some videos on youtube that are still working normal.

like this one: http://www.youtube.com/watch?v=JQ3aQUBoFPs&feature=aso

Same problem here. mid2010 MacBook Pro. Lion 10.7

Have the same problem here. Late 2008 MacBook Pro, Lion 10.7.

I don't have any advice, but I have the same problem as you and describe it here:

http://blog.erikphansen.com/weird-os-10-7-lion-audiovideo-problems.

I wonder if you are all having the same issues with QuickLook and QuickTime Player X when things start getting flaky. Rebooting always works. When it first happened, I tried to just log out, but that didn't help. Since then I've been rebooting once every day or three.

For what it's worth, I have a 2009 MBP.

Erik

same problem here Lion 10.7 macbook mid 2010. vlc, internet videos no sound. itunes cant be opened un unknown error -200 occured. other sounds work good. like for DVD player and other notifications.

Hey all,

I just updated my blog post because it looks like force-quitting the coreaudiod process in Activity Monitor fixes things without a reboot. Give it a shot and let me know if it works!

Erik

http://blog.erikphansen.com/weird-os-10-7-lion-audiovideo-problems

I have the same problem, found a post related to issues with the coreaudiod

https://discussions.apple.com/thread/3203808?start=0&tstart=0

1. Open Terminal

2. Type this "

sudo /Applications/TextEdit.app/Contents/MacOS/TextEdit"

3. enter your password

4. In textedit open /System/Library/LaunchDaemons/com.apple.audio.coreaudiod.plist

5. Change false to true

6. Save

7. Reboot

Will try this today.

Hello,

I have about the same problem, even after upgrading to 10.7.1.

VLC and Quicktime have no audio and iTunes won't even play (stays at 0:00).

Erik's suggestion seems the only one that works without the need to reboot the system.

I have also found another discussion here where they are exactly talking about the issue we are currently experiencing.

"Same problem here. I found an easy way to fix it without rebooting.

Run terminal and do this:

sudo killall coreaudiod "

It's just another way round from Erik's suggestion.

However this is just an annoying temporary solution, I look forward to receiving soon an official fix from Apple.

Until now, it just does not work as it should...

Same problem here.

No Audio with Youtube (Safari & Chrome) and VLC. iTunes works.

Restarting helps though.

Computer is a mid 2011 iMac i5 running os x 10.7.1

Most videos on youtube are flash ( flv files ), and they are played not using QT nor any other app but instead courtesy of Adobes flash plugin while web-videos that use the HTML5 codecs ( webm files ) are played via QT plugin in safari or any other browser.

Might be flash-plugin related. It can have issues in 64bit mode which is in Lion the default for all apps.

Try changing temporarly Safari to run in 32bit mode ( and / or QuickTime Player too ) :

reveal the icon for the app in Finder, get-info on the app, select checkmark "run in 32bit compatibility mode" and restart the app(s) you changed ( you can always undo this ).

If safari runs in 32bits, all plugins auto-change to 32bit too ( they exist all in hybrid/fat/double versions in Lion = 32 and 64 , only rarely an app is 32bit alone ).

The issue isn't isolated to Flash at all. When audio starts causing problems (for reasons I can't figure out) it happens for non-Flash related video and audio as well. Today iTunes wouldn't play a video because of the issue. Killing coreaudiod either via Activity Monitor or Terminal (with 'sudo kill all coreaudiod') fixes things. My blog post, Weird OS 10.7 Lion Audio/Video Problems (and how to fix it), describes the problem and solution.

Erik

I also got the exact same problem after upgrading from 10.6.8 to 10.7.1.

Suddenly Quicktime 7, X, iTunes or the FlashPlayer only play videos with sound for about a second, then the audio cuts out completely and the video stream plays fine (Quicktime 7, Flashplayer) or begins to stutter/freeze (Quicktime X, itunes).

The only way to temporarily fix this seems to be to restart the coreaudiod process.

Then it works for some time, and then it happens again. Nothing gets logged and it seems to be random.

Another thing worth mentioning is that when the dropout happens, only applications seem to be affected which were not running. For example if the dropout happens, a running iTunes won't be affected, but a newly started iTunes will be.

I already filed a bug report and I think it would be good if everybody who has the problem would do the same so that this issue gets some weight.