[vlc-devel] Re: lip sych problem

[serkan bozkurt]

Hi to all,

Can anybody tell me the known URL adresses of the
known clean(not broken(correct presentation time
values)) mpg files.


Best Regards....

--- serkan bozkurt <serkanboz80 at yahoo.com> wrote:

> Hi to all,
> A have 2 questions,
> 
> 1-)Why bad presentation times in the ES's results in
> audio and video synch. problem in RTP streaming.
> 
> 2-)If this presentation  times are bad why players
> do
> not have any sych problems between different medias.
> 
> Best Ragards....
> 
> 
> --- serkan bozkurt <serkanboz80 at yahoo.com> wrote:
> 
> > 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
> > > 
> > > -- 
> > > This is the vlc-devel mailing-list, see
> > > http://www.videolan.org/vlc/
> > > To unsubscribe, please read
> > > http://developers.videolan.org/lists.html
> > > 
> > > 
> > 
> > 
> > 
> > 	
> > 		
> > __________________________________ 
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> > 
> > -- 
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> > 
> 
> 
> 
> 	
> 		
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