[vlc-devel] Re: lip sych problem
serkanboz80 at yahoo.com
Mon Nov 28 09:47:59 CET 2005
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.
--- 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
> > 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
> > 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.
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