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

[Patrick GUENEAU <pgueneau@wanadoo.fr>]

hello Olaf,

In mpegtools packaged with linux-dvb driver you can find mplex program 
which can do what you want.

The doc says it can mux 1 video + 1 audio but in fact, the subroutines 
are able to handle 2 audio PES streams. Have a look at the code (domplex 
subroutine).

In case it may help you, here is a patch I proposed more a few months 
ago in this Maillist:

You may need to adapt this patch to the latest mplex version as it may 
have changed a bit.

========================================================================
--- mplex.cpp   Wed Jun 27 14:21:48 2001
+++ ../../../DVB/apps/mpegtools/mplex.cpp       Fri May 10 23:45:29 2002
@@ -240,7 +240,7 @@
         printf ("  --help,             -h:  print help message\n");
         printf ("  --type,             -t:  set output type (MPEG2, DVD,
SVCD (default), MPEG1, VCD, XSVCD)\n");
         printf ("  --of,               -o:  set output file\n");
-       printf ("  --input_stream,     -i:  set input stream type
(PS_STREAM (default), TS_STREAM, ES_STREAM (needs 2 input files audio
video))\n");
+       printf ("  --input_stream,     -i:  set input stream type
(PS_STREAM (default), TS_STREAM, ES_STREAM (needs 2 or 3 input files
<audio1> [ <audio2> ] <video>))\n");
         printf ("  --temp_dir,         -d:  directory for temporary
demux files\n");
         printf ("  --audio_delay,      -a:  set audio delay in ms\n");
         printf ("  --video_delay,      -v:  set video delay in ms\n");
@@ -332,6 +332,10 @@
         } else if (optind == argc-2 && !strcmp(inpt,"ES_STREAM")) {
                 strcpy(AudioFilename,argv[optind]);
                 strcpy(VideoFilename,argv[optind+1]);
+       } else if (optind == argc-3 && !strcmp(inpt,"ES_STREAM")) {
+               strcpy(AudioFilename,argv[optind]);
+               strcpy(Audio1Filename,argv[optind+1]);
+               strcpy(VideoFilename,argv[optind+2]);
         } else {
                 usage(argv[0]);
         }
@@ -404,7 +408,11 @@
         if (ptsdiff > 0) video_delay_ms += ptsdiff/90;
         else audio_delay_ms += -ptsdiff/90;

-       domplex(1,1);
+       if (strlen(Audio1Filename))
+          domplex(1,2);
+        else
+          domplex(1,1);
+
         if (strcmp(inpt,"ES_STREAM")){
                 unlink(AudioFilename);
                 unlink(VideoFilename);

========================================================================

Have fun !!

Patrick.



Olaf Beck wrote:
> Hello Folks,
> 
> I'm doing some work with a proprietary MPEG stream (TIVO - DirecTv). The PS 
> stream or what ever you would like to call it is of proprietary nature but 
> the PES stream is following the MPEG specs to some extent. 
> 
> I now have code in a early stage and it looks like it will be quite easy to 
> extract two PES streams from the "TIVO-PS" stream. One audio (either AC3 or 
> MPEG)  and one Video. I want to extact the PES stream since it will enable me 
> to keep the PTS information so the final PS stream is in sync.
> 
> Now for what all I have seen in forms of Open Source muxers is muxers that 
> only can mux ES streams or at least thats what a quick look tells me. Does 
> anyone know of a way to mux PES streams? 
> 
> Cheers Olaf 
> 
> PS: Yes, I could naturally modify a OSS muxer to take to PES streams but I 
> rather spend time coding on the extraction.
> 
> 
> 
> 




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