[vlc-devel] Re: Trick mode support for MPEG2 TS

[Christophe Burgalat]

The TS Muxer and the mpeg video packetizer plugin, used to stream out, does 
not support fast forward for example.
It need some developments but I'm not even sure it is possible...
It seems possible to recalculate PTS/DTS values in mpeg video packetizer 
pluign (I've tried it, it seems ok), but what about the frame rate value ? 
Should VLC send only one frame on two with a x2 speed ? Should VLC send only 
Intra picture when sending with x4 speed to limit bandwidth usage ? I have no 
idea on how to implement it.

Christophe

Le Lundi 6 Mars 2006 06:09, yj a écrit :
> It seems that VLC can play MPEG2 TS file with trick
> mode support, and, the VLC can stream out streams,
> is it possible for adding RTSP server support for VLC?
>
> --- Måns Rullgård <mru at inprovide.com> wrote:
> > Christophe Burgalat <c.burgalat at broadcastavenue.com>
> >
> > writes:
> > >> On Fri, 2006-03-03 at 02:00 -0800, yj wrote:
> > >> > Hi,
> > >> > I would like to know how to implement the Trick
> >
> > mode
> >
> > >> > support for MPEG2 TS stream.
> > >> > Actually, I want to get a RTSP server with the
> >
> > above
> >
> > >> > feature.
> > >>
> > >> There have been patches submitted by
> >
> > glen at lincor.com to provide
> >
> > >> trickplay support with vlc and Kasenna servers.
> >
> > Works well.
> >
> > >> Kasenna's are not cheap though.
> >
> > And there is no end to the pains they cause if you
> > buy them.
> >
> > > Yes but this patch only concerns VLC as a client,
> >
> > I'm right ?
> >
> > > It seems to be possible to integrate this feature
> >
> > also in VLC as a RTSP
> >
> > > server.
> > > I began to try developping it (in fact, fast
> >
> > forward only) and even if it
> >
> > > sometimes work well, I'm not sure to do it the
> >
> > right way... I wonder how
> >
> > > Kasenna server implements this feature.
> >
> > The Kasenna server creates special fast forward and
> > rewind streams by
> > extracting I frames from the original file and
> > fudging timestamps.
> > When a client requests a trick mode the server
> > switches to the
> > corresponding place in the ff or rew stream.  The
> > server also creates
> > indexes that let it quickly map between timestamp
> > and file offset for
> > each of the streams.  At least this is all how it is
> > supposed to work.
> > It is very easily confused, and can get the indexes
> > offset by several
> > minutes.  And that's when it doesn't lock up in
> > bizarre ways.
> >
> > --
> > Måns Rullgård
> > mru at inprovide.com
> >
> > --
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> > http://www.videolan.org/vlc/
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> > http://developers.videolan.org/lists.html
>
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