[mythtv-users] how many concurrent recordings possible? in HD?

James Armstrong james at thearmstrongs.org
Tue Dec 13 14:36:10 EST 2005

>>My mythtv system has 1xPVR-350, 1xPVR-500 using ivtv 0.4, and a newly added
>>DViCO FusionHDTV 5 Lite using DVB drivers.   1x200GB seagate+1x300GB seagate
>>HD LVM with XFS for /video and 1x40GB seagate for FC4 OS. I have DMA
>>enabled. DVI out via fx5200 at 1280x768.  Chaintech nforce2 mobo, AMD2900
>>with 1gb ram.  All 4 tuners can capture on their own with no problems.  I
>>can capture with all 3 Hauppauge tuners at the same time no problems.
>>Trying to capture HDTV while capturing with the Hauppuge cards results in
>>normal analog recordings but the digital recording has dropouts and
>>scrambled bars across it.  I need to double check if capturing digital NTSC
>>with the DViCO card also has the dropouts when one or more PVR cards are in
>>I'm new to the HDTV part of mythtv and looking for feedback to tell me if
>>what I'm trying to do is realistic or not.   And if it is realistic, where
>>should I look to troubleshoot.  Thanks for any insight.
> You might also consider moving your playback to a 2nd machine. If you
> remove playback from that existing machine, it should be able to keep
> up fine with HD recording/etc.
> In my experience the frontend process is very spikey (as are video
> drivers), which can wreck havoc with dmas/irqs and getting stable
> recordings.

My backend records 2 HD streams and 1 PVR250 at the same time with no 
problems on a 2400AMD with 512megs ram. I have a separate frontend for 
playback and can watch 1 HD at the same time the other three are 
recording with no problems. I have recorded 2 HD and 2 PVR250's at once 
but the second 250 is not used any more now since I got rid of cable and 
do mostly off air HD.

- James

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