[mythtv-users] "Squeaky" audio when using Plextor M402U

Chris DiLorenzo cdilorenzo at alum.rpi.edu
Mon Apr 2 00:08:29 UTC 2007


I'm using a Plextor M402U to capture from DirecTV.  I am running Gentoo with
the 2.6.18 kernel.  I patched the Go7007 drivers and was able to build them
with no problems.  When I use the gorecord application, I am able to capture
video with no problems.

However, when I use MythTV (ver 0.20) I can capture shows, but the sound is
horrible.  There is this annoying high pitched hum or squeak and the voices
are distorted.  It is not my frontend  system since the distortion occurs
when I play the files with mplayer directly on the bcakend.

When a recording starts, I do get the following errors:

2007-04-01 17:30:06.182 External Tuning program exited with no error
VIDIOC_S_CTRL:V4L2_CID_AUDIO_MUTE: Invalid argument
2007-04-01 17:30:06.840 NVR(/dev/v4l/video0) Error: Can't open vbi device:
''
2007-04-01 17:30:06.936 Started recording: Drake & Josh: channel 2299 on
cardid 9, sourceid 2

The recording is normal in every other way, except for the sound.

I am using a 44100 Hz sampling rate.  This problem occurs whether I use MP3
audio or uncompressed PCM audio.

I have ALSA with OSS emulation built into the kernel.

If you want to hear an example, you can download a nuv from
http://home.comcast.net/~dilorc/Bad_MP3.nuv

Any ideas?
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