Re: MPEG2 muxed frame by frame playback

Subject: Re: MPEG2 muxed frame by frame playback

From: Brad Ford <email@hidden>

Date: Tue, 5 Jun 2007 10:30:45 -0700

Delivered-to: email@hidden

On Jun 5, 2007, at 8:23 AM, Michael Huffaker wrote:

<SNIP>

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.

It's been noted many times on this list that muxed MPEG2 is currently not treated as a "first-class" citizen when imported as a QuickTime movie, or residing as a track in a QuickTime movie. QuickTime's MPEG2 media handler is capable of internally demuxing its stream for playback purposes, but does not present muxed material as separate video and audio tracks. If it did, it would be lying, since they're not. Currently audio extraction only works with audio tracks. So your muxed MPEG track doesn't get to participate in that mechanism.

-Brad Ford

QuickTime Engineering

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Follow-Ups:

Re: MPEG2 muxed frame by frame playback
- From: "David M. Cotter" <email@hidden>

References:

>MPEG2 muxed frame by frame playback (From: "Michael Huffaker" <email@hidden>)