[mythtv-users] PVR 250 problems

Mark Jacob mjacob1 at san.rr.com
Mon Jun 9 13:28:13 EDT 2003


> 
> 1. Is everyone experiencing frequent lock-ups with the PVR250 and if not what 
> did  you do to stabilize this?

Hard lockups (need to press the reset button) or application lockups? I 
was having hard lockup problems when running a 2.4.20 kernel with low 
latency scheduling and preemptible kernel patches. I switched to a 
vanilla 2.4.20 kernel with the kraxel v4l2 patch and the hard lockups 
went away.

> 2. In the past couple of days I've noticed the sound getting choppy/jerky and I
> 'm getting a error something like "Soundcard not reporting size correctly... 
> reverting to old method". Not sure If I've had this error from the beginning but 
> I don't think so. Could this be related?

Are you using ALSA? I have an SBLive! card and when using the oss 
drivers the sound was terrible most of the time. I switched over to the 
ALSA drivers last night and the audio smoothed out considerably. Now I 
have to run a kernel compile and chew up all the CPU to get choppy 
audio/video.

> 3. When using my PVR card on a windows box I noticed that It had only 3 or 4 
> selectable bit-rates Anyone remember what those are and could this be related to 
> the smaller bitrate=choppy/jerky problem?
> 

I get video jitter (noticeable on the cnn crawler) no matter what the 
bitrate. Experimental A/V Sync and jitter reduction do not seem to help 
much either. I'm currently recording at 740x480 with bitrate=2500000 and 
bitrate_peak=8000000.

Mark



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