[mythtv] Audio warble in MythTV with simultaneous record and playback.

Isaac Richards mythtv-dev@snowman.net
Sun, 29 Dec 2002 12:55:50 -0500

On Sunday 29 December 2002 12:52 pm, Chris wrote:
> I notice the audio warbles (distorts, gets scratchy)  some with
> simultaneous record and playback.  The warble effect decreases with time
> but sometimes not completely goes away.  This can be heard in recordings
> that are done when there is simultaneous playback.  If a recording is
> done without simultaneous playback, there is no audio warble.  I managed
> to reduce this by reducing the audio data rate to 22050 in Myth 0.7.  I
> dont know what causes this but I speculate it is the system trying to
> keep up with simultaneous access to the hard disk by the encoder and the
> player components.   Has anybody else experienced this?  I am running
> Redhat 8 with the kernel drivers (not alsa).  Using MPEG4 at 480x480
> with 2000 data rate for video.  Thanks

More likely, it's your soundcard having problems with full-duplex operation.