[linux-dvb] Re: Suggestion for channel tuning

[Jan Panteltje <root@panteltje.demon.nl>]

On Sat, 21 Apr 2001, Matthias Weingart wrote:

> 
> 
> 
> On 21 Apr 2001 ma.hoff@bigfoot.com wrote:
> 
> > 
> > btw: Anyone read my other thread about vdr playback not smoothly ? Maybe
> > someone can just say that its the same or that he hasn't the same
> > problem. Then I know if I can do anything about it ! Thanks! 
> 
> I have observed this too. But I think the reason for that is the same as
> for video/audio distortions/dropouts.
> 
>         Matthias
> 
> 
For all I know, the things I have seen are related to data troughput.
If there is a lot of motion in the picture, or screen shot sequences
that change a lot etc, the harddisk light gets a boost:-)
I have done some experimenting with the old driver and VDR, and also
just cat /dev/video, and it is OK as long as the information content is low.
renemeber mpeg sends the difference, so data that changed.

I think (k6 2-450 on MSI mobo) that it in my case is related to the fact
that Linux disables DMA by default on this mobo chipset (forcing
DMA srewed op a hard disk, so I am not going to try again).
So maybe the trick here is to use DMA and maybe a mobo that allows it in
Linux, that should allow some more data output.
On the old mobo I had DMA disabled, and multi sector set with hpparm.
And the multi-sector setting made a WHOLE lot of difference (for the better).
This is all I understand about it at the moment, just a matter of
data throughput.
This is only for the 'hickups' in the picture though.
Regards
Jan



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