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MPEG2 muxed frame by frame playback
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MPEG2 muxed frame by frame playback

Title: MPEG2 muxed frame by frame playback

Hello -

I have purchased Apple's MPEG2 playback component and am trying to playback frame by frame a multiplexed (audio/video in one stream) MPEG2 file. In real time. The video interface creates the movie then loops:

                GetMovieNextInterestingTime(pMpgData->QTMovie,flags,0,NULL,GetMovieTime(pMpgData->QTMovie, 0),

                                                                fixed1,&frameTimeMovie,NULL);

                SetMovieTimeValue(pMpgData->QTMovie, frameTimeMovie);

               

                UpdateMovie(pMpgData->QTMovie);

                MoviesTask(pMpgData->QTMovie, 0);

       

                PixMapHandle pmh = GetGWorldPixMap(pMpgData->GWorld);

                char * src_addr = GetPixBaseAddr(pmh);


The video stream does work but comes out slow, halting.

The audio interface creates the movie independently then establishes an audio session (AudioStreamBasicDescription) to read the audio data. All return codes come back OK, but the audio is silent.

Is the above approach feasable? Particularly give the mysterious FAQ about the MPEG playback component –

Can I use the MPEG-2 Playback Component to de-multiplex (i.e., de-mux) multiplexed streams?

While multiplexed streams can be played back with the QuickTime MPEG-2 Playback Component, de-multiplexing of these streams is not supported.

Thank you for your time,


Michael Huffaker

BroadcastPix







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