[vdr] Re: replay hickups when recording on second interface

[Wolfgang Fritz <wolfgang.fritz@gmx.net>]

Henning Holtschneider wrote:
> Hi,
>
> last weekend, I decided to give the VDR developer version a try. 
> Everything works fine except for audio/video "hickups" during replay 
> when a recording is running on the second card. In this case, the 
> picture will freeze for a friction of a second (most of the time only 
> the lower half) and after that audio and video will be out of sync for 
> 2-3 seconds.
>
> The problem occurs every 16 seconds if I start the replay after the 
> recording and every 32 seconds if I start the replay before the 
> recording (i.e. timer starts while replay running). I'm currently 
> running VDR with DO_REC_AND_PLAY_ON_PRIMARY_DEVICE undefined because the 
> problem is even worse if a recording is running on the card that is 
> performing the playback.
>
> My configuration:
>
> Pentium II @ 300 MHz
> IDE hard disk with DMA access turned on
> two Rev. 2.1 Hauppauge DVB-s cards on different interrupts
> Linux kernel 2.4.18
> XFS 1.1 on /video partition
> DVB driver snapshot from ftp.cadsoft.de dated 12/08/2002
> patched Root
> VDR 1.1.20
>
> I don't think there is anything wrong with the recordings I'm replaying 
> because the distortions are not bound to specific frames of a recording. 
> The files also play fine on my PC.
>
> Is anyone out there experiencing the same problem?
I had similar problems with a Pentium 133 MHz system which clearly was 
too slow doing simultaneous recording/replaying (I have only one DVB 
card BTW, so I had to enable DO_REC_AND_PLAY_ON_PRIMARY_DEVICE etc.

I got a lot of "buffer empty" kernel messages in the syslog, which seem 
to indicate that VDR was not able to deliver data to the DVB driver fast 
enough. Additionally I often got "ring buffer overflow" messages from 
VDR during recordings. In that case the recording was damaged, so VDR 
seemed to be not able to write the data from the DVB driver fast enough 
to disk.

The "ring buffer overflow" errors have disappeared since I installed VDR 
on a VIA EPIA ME6000 motherboard (600 MHz Via Eden processor), but I 
still have occasional "buffer empty" messages when replaying while 
recording. I have not seen distortions on the screen up to now, but I 
have this board running since yesterday only and therefore only done 
very limited testing.

Wolfgang

> Regards,
> hh
>
> P.S. Klaus, thank you so much for the plugin design! Now I can finally 
> use just the additional features I want without having compile tons of 
> other stuff that I never use anyway ;-)



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