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TrackMatrix translations not working?
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TrackMatrix translations not working?


I've got two movies that I would like to play together, with a smaller movie inset into a larger one.

I'm using InsertTrackSegment to do this, and it works great. The smaller movie appears in the top left corner of the bigger one, and plays fine.

However, I would like to be able to set the location of the inset movie (e.g. to offset it from the edge a little, or to put it in other corners).

I assumed that SetTrackMatrix would let me do this, but it doesn't seem to be having any effect for me. Am I just using it incorrectly, or is there another way to do this?

Code follows below:

    NSArray *theInsetMovieTracks = [theInsetQTMovie tracks];
    int i;
    for(i = 0; i < [theInsetMovieTracks count]; i++)
    {

QTTrack *theQTTrack = [theInsetMovieTracks objectAtIndex:i];
NSString *mediaType = [[theQTTrack trackAttributes] objectForKey:QTTrackMediaTypeAttribute];

        NSLog(@"Adding track %d of type %@", i, mediaType);

        Track theTrack = [theQTTrack quickTimeTrack];
        Track destinationTrack = NULL;


        theError = AddEmptyTrackToMovie(theTrack,
                                      theBackgroundMovie,
                                      backgroundMovieDataRef,
                                      backgroundMovieDataRefType,
                                      &destinationTrack);

if(theError != noErr)
{
NSLog(@"WARNING: AddEmptyTrackToMovie failed: %d", theError);
return -1;
}

        TimeValue srcIn = 0;
        TimeValue srcDuration = GetTrackDuration (theTrack);
        TimeValue dstIn = 0;

        theError = InsertTrackSegment(
                                  theTrack,
                                  destinationTrack,
                                  srcIn,
                                  srcDuration,
                                  dstIn );

        if(theError != noErr)
        {
            NSLog(@"WARNING: InsertTrackSegment failed: %d", theError);
            return -1;
        }

if([mediaType isEqual:QTStringForOSType(VideoMediaType)])
{
NSLog(@"Setting inset track offset to %d, %d", (int) offsets.x, (int)offsets.y);
// Set a track matrix
MatrixRecord matrixRecord;
SetIdentityMatrix(&matrixRecord);
// set the x and y offsets
TranslateMatrix(&matrixRecord, (int)offsets.x, (int) offsets.y);
SetTrackMatrix(destinationTrack, &matrixRecord);

theError = GetMoviesError();
if(theError != noErr)
{
NSLog(@"WARNING: Could not set the track matrix: % d", theError);
return -1;
}
}
}



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