[linux-dvb] Re: Linux DVB API 4 Q's

["Haber, Thomas" <THaber@tee.toshiba.de>]

Hi Rob,

your arguments are not obvious to me.
Maybe its because i did not follow the whole thread.

If i understood it right you can add filter and do afterwards the start.
And even if you use autostart, and your audio start will be delayed,
this does not mean that your audio is not in lip sync, 
it only starts some time later (10 ms is nothing in here).
  
regards,

tom


> -----Original Message-----
> From: Rob.McConnell@Zarlink.Com [mailto:Rob.McConnell@Zarlink.Com]
> Sent: Montag, 6. Oktober 2003 19:51
> To: Johannes Stezenbach
> Cc: linux-dvb@linuxtv.org; Ralph Metzler
> Subject: [linux-dvb] Re: Linux DVB API 4 Q's
> 
> 
> 
> 
> 
> > > Ahh, maybe if we implement your DVB_DMX_SET_PID_FILTER 
> with an array of
> > > PIDs to set and start immediately using the 
> DVB_DMX_IMMEDIATE_START
> flag,
> > > we can nicely obtain this requirement.
> > >
> > > Do these ideas sound reasonable?
> 
> > If I were to implement it I would go with your last proposal.
> 
> > But I am not convinced that your requirement is reasonable. If you
> > do a few ADD_PID or DEL_PID calls in succession, they would
> > typically be only microseconds apart (possibly a few milliseconds
> > if the system load is high). Why is that a problem?
> 
> From a Q.A. point of view, the audio and video should not be 
> out by greater
> than 10ms (in terms of audio lagging behind the video). Can we really
> guarantee this requirement between successive system calls?  
> What happens
> if you execute the first system call to setup the video PID 
> and when it
> exits the scheduler decides to execute some other process 
> that could be
> very time consuming?  We may not get back to setting up the audio or
> subtitle PID for quite some time later.  Don't forget that we are not
> running on 1GHz+ uProcessors, but rather more like 100MHz+.  If we can
> setup the video/audio/subtitle PIDs all in one go, then at least we
> wouldn't have this worry.
> 
> Rob :^)
> 
> 
> 
> 
> 
> 
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> 
> 


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