Look https://www.ipcamtalk.com/showthread.php/9604-RasPipC-Cameras-on-your-TV-made-Easy?p=86483&viewfull=1#post86483
I guess the Same Problem with Sound.
Edited:
in worker.py line 16
proc=subprocess.Popen(['/usr/bin/omxplayer', '--live', '--timeout', '60', '--aidx', '-1', '-o', 'hdmi'...