[linux-dvb] Glitches in recordings

Preston Crow pc-linuxtv05 at crowcastle.net
Fri Nov 4 22:04:22 CET 2005


I'm using an old HD-2000 with a rooftop antenna and a new HD-5000 with
digital cable QAM.  With the HD-2000, I used to get a perfect image with
the video4linux drivers, but I switched to the DVB drivers several
months ago, and started getting digital artifacts popping up in the
image occasionally.  Now I also get them with the HD-5000 card, but only
when recording HD channels; the standard-definition channels are
perfect.

I'm now running recent CVS DVB with 2.6.14.  My first guess was that a
buffer was filling up too fast, causing some data loss.  I tried a
larger value for DVR_BUFFER_SIZE in dmxdev.h, but that didn't seem to
help.

I have this problem whether I'm recording in MythTV or simply using
`cat` to a file.

My system is an AMD 2500+.  Using mplayer with xvmc hardly taxes the CPU
on HD playback, and the glitches are identical on each playback, so I'm
confident that it's not a playback issue.

Any advice on what to try next?

--PC





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