[vdr] Re: Nothing good for me... [Was]-> ( Implementing newdevice, but video is choppy)

[Holger Waechtler <holger@convergence.de>]

Reinhard Nissl wrote:
> Hi,
>
> I've had the same stuttering problem with my vdr-xine-0.0.2 plugin. 
> Since vdr-xine-0.0.3 (aka 0.1.0) I've solved the issues similar to your 
> approaches so far. I think, the hint below will solve your final problem.
>
> Stefan Schluenss wrote:
>
> > Maybe i'm wrong, but
> > how does you control the output "speed" of your decoder ? You have to 
> > adjust your decoding system clock to that of the data source. That's 
> > the reason for the SCR (System Clock Reference)-Fields in the MPEG 
> > format definition.
> > If it's not done, your buffer could run empty resulting in choppy 
> > video output.
>
> Absolutely true. As long as the decoder's system clock is running ahead 
> of the stream's system clock reference, the decoder throws away every 
> frame that is too old until it gets up to frames that are in the future.
That's where the PCR pid is for - a pretty clean implementation of 
PCR/STC management is e.g. contained in the streaming code of VLC, take 
a look there to get an idea what needs to get done...

Holger



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