My xbox was doing the same thing (only sound in videos) until I did the new update with the avatars -
If doing the update through xbox live is giving you an error, try doing it from a flash drive or cd -
Instructions and download link for newest update are here:
http://support.xbox....em-updates.aspxI did not have to update my "optional media codec" so once you get the update to complete successfully, you should be good to go...
(remember to have your hard drive/storage device attached when you try the update, so that the update has somewhere to put the avatar data...)
Thank you so much for this post.....I thought my banned (but never actually physically banned) xbox was toast...I use it to play games early on but mostly as a media player....Its been sitting for 2 months until I just seen this post....Worked like a charm to do the update and I never had to update the actual codec either. THANK YOU!!!!! I LOVE FORUMS!!!!!!!