[vdr] Re: remux.c: splitting PES packets into 2048 byte blocks

[Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>]

Pekka Virtanen wrote:
> 
> Ragnar Sundblad wrote:
> 
> >
> > --On den 10 maj 2004 00:04 +0200 Reinhard Nissl <rnissl@gmx.de> wrote:
> >
> >> what's the reason for splitting PES packets into smaller ones with 2048
> >> (= IPACKS) bytes?
> >>
> >> I have a problem with that, when I want to replay dolby audio (AC3) with
> >> xine.   xine's demuxer currently expects the AC3 data to be supplied in
> >> one big block (the original PES packet, as it was transmitted in the
> >> TS).
> >
> > I have ignored this problem in my plugin (ttxtsubs) since teletext
> > packets never are that large, but I know that the DVB subtitles
> > plugin uses some header trick to be able to find its packets
> > after the split.
> 
> I use the PES' extension header to tag subtitling IPACKs. Using these
> tag I could recreate the original PES-packet. I implemented my decoder
> so that I can feed it PES-fragments so I don't really do the receationg.
> 
> If you (rnissl) know which IPACKs are AC3 (the problem that ragge
> explained) it's pretty easy to recreate the original PES packet. The
> first IPACK-contains the original header and the following ones have
> special header with the ORIGINAL_OR_COPY bit set to COPY.
> 
> btw, Klaus would you be interested in integrating the recording patch
> from subtitles? It would enable to record many PRIVATE_STREAM_1's, e.g.
> AC3 tracks. Currently it's not that generic but  that would be possible.

I'll get back to you on this when I actually get to work on that.
Currently I'm busy with totally different stuff...

Klaus


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