[linux-dvb] Re: Any way to mux two PES streams/files to a PS stream?

[Olaf Beck <olaf_sc@yahoo.com>]

Hello Marcus

Big thanks for taking the time to answer my mail. However I really don't get 
what you try to tell me, maybe it's too early in the morning for me :-).

Anyways, yes you are correct the TIVO "mpeg" file is mux however in it's very 
own way.  Even if I manage to throw away all proprietary information I still 
endup with a muxed PES stream (both audio and video present in the stream) 
without any PS information in the stream at all.

Now reading the MPEG2 standard part 1, made it obvious to me that the right 
way to go was to have two (or more) PES streams extracted from the TIVO file 
and then mux them to a MPEG2 PS stream. 

I assume that I can't just do "mplex -t MPEG2 -i PS_STREAM  -i 
tivo_muxed_pesfile  -o out.mpg" since the raw tivo file with proprietary 
information removed isn't a PS stream. 

In the dvb-mpeg tools I see tools such as pes2ts  but it only take one PES 
stream and not two (or more) hence I will endup with a TS that only has e.g. 
audio.

In regards to sending you a TIVO stream I think it's easier for me to write a 
prog that parses the TIVO stream, and send that along with some streams. The 
tivo stream is very messy to be modest - just sending you a stream and you 
will not be able to interpert it. E.g. it's packaged in a Chunk format each 
chunk having 128k of data, in each chunk you have a header with "pointers" to 
each "mpeg" "record" in the chunk" . Records can span several chunks, there 
can be duplicatied chunks, and so on :(. 

Since I'm hacking a extractor of PES (or ES) streams from the tivo file it 
will include a parser, it will propaby take me a week before it's in a 
somewhat stable state. I will then send it to you so you can have a look if 
you can fold it in to the mpeg-tools package of mpeg related programs.

Ahh, while at it the output type of DVD in mplex, how complete is it? Will it 
just create holes for the NAV packs or is it a real thing with real data in 
the NAV packs?

Cheers Olaf



On Saturday 19 October 2002 02:56, you wrote:
> If you have a stream that comes with both audio and video PES included
> it should already be muxed correctly. So all you have to do is through
> away the proprietary information and it should work.
> If you want an ES, then you can use mpegtools from the DVB drivers or the
> latest version from http://www.metzlerbros.de/mbros/dvb/ (compile with
> make -k because of dvbaudio).All the programs that read PES explicitly
> search for PES header and ignore all extra data. Have a look at the
> README to find the program you need.
> If you can give me an example of a TIVO stream, I might be able to add a
> program to the tools that does exactly what you need.
>
> Marcus



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