[Live-devel] How to mux a MPEG-4 video and audio stream into a MPEG-2 TS

[Lonnie Walker]

I created a test program that multiplexes a MPEG-4 video and MPEG-4 audi
o file into a MPEG-4 Transport stream. I can play the resulting .ts file
fine with MPlayer (video and audio), but VLC only plays about 10 seconds
of the audio even though video continues to play.

The program is attached. Does anyone have any ideas why the audio
doesn't play completely using VLC. 

Thanks

Lonnie

On Tue, 2008-06-03 at 16:08 -0400, Lonnie Walker wrote:
> Ross thanks for the prompt response. Yes, I verified that the
> mpegversion parameter is 4 once handleNewBuffer is called. I will dig
> into MPEG2TransportStreamMultiplexor.cpp more and try to diagnose the
> problem further. In the meantime, do you have any other suggestions?
> 
> Thanks
> 
> Lonnie
> 
> 
> 
> 
> On Tue, 2008-06-03 at 08:01 -0700, Ross Finlayson wrote: 
> > >I'm trying to multiplex a raw MPEG-4 bytestream and AAC audio bytestream
> > >into a MPEG-2 Transport stream. I have a test program in which I take
> > >the audio and video streams and mux them together into a MPEG-2
> > >Transport stream.
> > >
> > >My program does successfully mux the video into a MPEG-2 TS. My problem
> > >is that the audio doesn't play when I play the Transport stream back
> > >using VLC. The video plays back fine, but I can't hear the audio. After
> > >analyzing the Transport stream I was able to verify that there are PIDs
> > >for both video and audio.
> > >
> > >Does anyone know what steps are involved to multiplex a AAC stream into
> > >a MPEG-2 Transport stream using live555?
> > 
> > Are you sure that - in your code - the "mpegVersion" parameter is 4 
> when "MPEG2TransportStreamMultiplexor::handleNewBuffer()" gets called?
> > 
> > The problem may be that the current Transport Stream multiplexing 
> > (i.e., construction) code - implemented by the 
> > "MPEG2TransportStreamMultiplexor" class - originally assumed that the 
> > constituent audio and video streams were both MPEG-1 or MPEG-2; there 
> > was originally no support for MPEG-4 audio or video.
> > 
> > Since then, support was added for MPEG-4 audio and video.  However, 
> > it's conceivable that there are still problems with this.
> > 
> > You may want to take a look at "MPEG2TransportStreamMultiplexor.cpp" 
> > - in particular, the "if" statement that starts at line 108.  If you 
> > find something that needs to be changed there, please let us know.
> 
> 
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