[mythtv-users] plextor convertx tv-402u audio dying

Nathan Lutchansky lutchann-mythtvusers at litech.org
Thu Aug 18 15:44:44 UTC 2005

On Wed, Aug 17, 2005 at 04:37:55AM -0700, Adam Felson wrote:
> > Nathan Lutchansky <lutchann-mythtvusers at litech.org> wrote:
> > On Tue, Aug 16, 2005 at 09:46:09PM -0700, Adam Felson wrote:
> > > I recently got a plextor usb2 tv capture box and am having problems with
> > > the audio.  It can barely go 20-40 minutes without dying.  Once the
> > > recording is stopped and another one started then the problem is
> > > cleared... for a little while.  When watching live-tv, I can get things
> > > working again by exiting live-tv and going right back to it.
> > 
> > Is the audio OK before you lose it?  Is there any stuttering or does it
> > get out of synch with the video?  Are you recording uncompressed audio
> > or MP3?
> It's fine right until the point it dies.  I'm recording mp3;  I've tried
> 32Khz and 48khz sample rates.

You want to use 48khz as that's the only sampling rate the hardware

> > > The errors in the mythbackend log are of the form:
> > >  2005-08-16 21:37:30.298 NVR: Only read -1 bytes of 16384 bytes from
> > > '/dev/dsp1 
> > > read audio: Input/output error
> > 
> > Sounds like the audio buffer on the hardware is getting overrun, which
> > causes the audio pipe to lock up.  Usually this happens because of bus
> > errors or because the host CPU can't service the audio pipe fast enough.
> > 
> > What video bitrate are you running?  Is the convertx connected to a USB
> > 2.0 port?  Do your other USB devices work OK?  Have you tried swapping
> > out the USB cable, or hub, if you're using one?  -Nathan
> It's connected straight to a USB 2.0 port and the error occurs with no
> other USB activity.  I haven't tried using a different USB cable yet.
> About 2000-2200 kb/s. (.7-1.0GB/hr)
> If nobody else has experienced anything like this, then it's possible I
> have bad hardware.

Yeah, sounds likely, but the question is which piece of hardware?  :-)
Are there any interesting messages in your system log that might
indicate a problem?  -Nathan
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