failure. So far this has produced (on OS/X) the following when mpeg2enc
is run with other than -M 0:
INFO: [mpeg2enc] Creating worker thread
2 pthread_mutex_lock=22
That message comes from channel.hh. error 22 is EINVAL which seems to point
at the 'atomic' mutex not being initialized. The manpage says:
[EINVAL] The value specified by mutex is invalid.
