[vlc-devel] Re: lip sych problem

[serkan bozkurt]

Hi DJ,

I have a questions :

You are saying that "player plays broken mpg's but it
does not mean it is streamable".

Can you please explain about in more detail.

Best Regards..

--- Derk-Jan Hartman <hartman at videolan.org> wrote:

> On 28-nov-2005, at 0:14, Ross Finlayson wrote:
> >> Should add here - RTP streams are actually 2 (at
> least) different  
> >> streams
> >> with different payloads
> >
> > This is correct.
> >
> >> that are not syncronised well (look at live555
> >> mailing list). I.e - system will "sync on average
> bitrate", not on  
> >> each
> >> video packet. It means, that LiveMedia free
> library do not contain
> >> mechanisms to make A/V sync/resync.
> >
> > But this is all completely false.  See
> <http://www.live555.com/ 
> > liveMedia/faq.html#separate-rtp-streams>
> >
> > Once again: If your original data source (at the
> server end) has  
> > (i) proper presentation times (corresponding to
> the 'wall clock'  
> > time generated by calling "gettimeofday()"), and
> (ii) it properly  
> > implements RTCP, then RTSP/RTP clients that use
> the "LIVE555  
> > Streaming Media" software - including VLC - *will*
> get correct,  
> > time-synchronized presentation times.
> >
> > If, however, your server does not implement RTCP,
> and/or does not  
> > use properly synchronized presentation times to
> begin with, then  
> > you're SOL.  End of story.
> >
> > I spent a lot of time making sure that the LIVE555
> RTP/RTCP  
> > implementation works properly - to generate
> correct, time- 
> > synchronized presentation times at the client end.
>  I wish people  
> > would stop claiming that this doesn't work.
> 
> The problem here is that there is tons of material
> in the wild that  
> does NOT have proper timestamping and
> synchronisation. The fact that  
> lots of this material works in most players, does
> not mean it is per  
> definition streamable. The fact is the file is
> BROKEN. People need to  
> understand this. For MPEG material, like 85% is
> probably broken.
> 
> DJ
> 
> -- 
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> 
> 



	
		
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