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

[Pekka Virtanen <pekka.virtanen@sci.fi>]

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.

-- pekka

-- pekka



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