Can't stream audio from OSX Mavericks to Apple TV
Solution 1:
much simpler command:
sudo pkill coreaudiod
Solution 2:
Just had this problem myself, and this solution worked for me: Open a terminal and kill the audio driver, it will restart and everything should work straight away.
sudo kill `ps -ax | grep 'coreaudiod' | grep 'sbin' |awk '{print $1}'`
Solution 3:
sudo killall coreaudiod is easier.