Capturing multiple video streams into a movie file

Question

I am using QTKit to capture 3 media streams simultaneously: audio, video, and display (display is screen capture), and would like to capture them in a time-synchronized fashion to a single .mov file.
I have been able to successfully capture these three streams to 2 separate .mov files by using 2 QTCaptureSessions (one for audio/video, one for display video), but the problem here is that the 2 files are not time-synchronized (I have no idea how to synch them after the fact).
The more intuitively correct thing to do is to use a single QTCaptureSession instance with 3 inputs (2 video inputs and one audio) to do the capture, which should automatically synch all the streams. Furthermore, since the .mov file can support an arbitary number of streams, I figured wiring up the QTCaptureSession to output to a single .mov file would be easy. I was wrong.
The problem is that even though my QTCaptureSession has 3 nice input connections (2 video and 1 audio), when I wire up a QTCaptureMovieFileOutput to it, the resulting QTCaptureMovieFileOutput object has ONLY 2 connections: a single video and a single audio.
Here is snippets of what I am doing:
// add audio input: (type of media is QTMediaTypeAudio), succeeds
[qtSession addInput:[QTCaptureDeviceInput deviceInputWithDevice: qtAudioDevice] error:&qtError]
// add video input: (type of media is QTMediaTypeVideo), succeeds
[qtSession addInput:[QTCaptureDeviceInput deviceInputWithDevice: qtVideoDevice] error:&qtError]
// add display input: (type of media is QTMediaTypeVideo), succeeds
[qtSession addInput:[QTCaptureDeviceInput deviceInputWithDevice: qtDisplayDevice] error:&qtError]
// create file output
QTCaptureMovieFileOutput * qtFile = [[QTCaptureMovieFileOutput alloc] init];
[qtSession addOutput:qtFile error:&qtError];
// PROBLEM: if I look at this array of connections, it has ONLY 2 connections
// 1 video, 1 audio!!!
NSArray *connections = [qtFile connections];
// start capture running
[qtSession startRunning];
// wire up to my file
[qtFileOutput recordToOutputFileURL:[NSURL fileURLWithPath:outputFileName]];
I desperately need help....my questions:
1. Since QTCaptureSession supports arbitary inputs, and QTMovie supports arbitrary # of streams, I can't believe it's not possible for me to simply "hook" all the inputs of QTCap to output connections that will write to streams in one movie file. Clearly, QTCaptureMovieFileOutput is not doing this...can anyone tell me how to do this? This can't be hard, right?
2. If I have to fall back on the ridiculous approach of capturing 2 unsynchronized .mov files and somehow synching them after the fact, can anyone provide a pointer on how to do that?
Thanks VERY much!
Steve

Answer 1

As posted by Andy Mees...
perhaps more realistic (and fcp friendly) would be this:
http://www.virtualvtr.com/pictureready/index.html
or this gem that popped up on the LAFCPUG boards a few days ago ... well worth a gander
http://www.softronmedia.com/products/products/mvr.html
...in this thread...
http://discussions.apple.com/thread.jspa?messageID=5968334&#5968334
Hope that helps,
K