[dvblast-devel] DVR_BUFFER_SIZE issue

[Christophe Massiot]

Le 25 janv. 2012 à 09:42, Richard Hemzal a écrit :

> I have met issue that getting message from dvblast 
> 
> error: couldn't read from DVR device (Value too large for defined data type)
> 
> in some cases.
> It looks that this message I am getting when szstem has some filesystem activity and it is probbaly related also with driver of
> card, in my case TBS6280. I also cannot exclude that this can affect usage of traffic control rules. In fact problem happens not
> each time, but in same system within few minutes will apear.
> 
> Solution, or workaround,  is to expand DVR_BUFFER_SIZE in dvb.c

Another possible solution would be to raise DVBlast's priority with nice or schedtool.

> originaly
> #define DVR_BUFFER_SIZE 40*188*1024 /* bytes */ 
> must change into 
> #define DVR_BUFFER_SIZE 200*188*1024 /* bytes */
> 
> I can say that also value 100*188*1024 not enough. 
> 
> Should we do this value controllable from command line? 

Do you know if this value as an influence on the latency ? Actually I thought until now that is was of no use at all (wasn't connected to anything behind), but maybe it depends on the driver.