Comment 1 for bug 133931

Thank you for reporting this bug, and trying to help make Ubuntu better. However, this is not a bug - the units of all the bitrate parameters have changed from kbit/s to bits/sec. Thus, your first command line is asking for an audio bitrate of 384 bits per second, or approximately 0 kb/s, which is what ffmpeg gave you. What you obviously meant was "-ab 384000" or "-ab 384k".