Comment 85 for bug 1191603

First, those are not warning messages; they are debugging messages. Therefore they should not be stored in your system log or printed out.

Second, if you are using a USB webcam then the webcam can't send audio data to the system if no processing is asking for it.

Third, the messages indicate that the audio I/O was blocked for more than 0.25 second. That's a very long time for this sort of thing. You might try to find out what caused that blockage and fix it.