macOS QTMovie tracks count == 0??

[Chirone]

if i load an existing quicktime clip as a QTMovie, and it has a video and audio track i should be able to get the tracks by going

[mQTMovie tracks]

right?
and being an NSArray i should just be able to go

[[mQTMovie tracks] count]

and get the number of tracks right?
for some reason the count is 0...

has anyone else had this sort of problem?

 

[lee1210]

Is nQTMovie nil? How did you initialize it? Do other things you call on it work?

-Lee

 

[Chirone]

ok,

i just printed the number in the wrong string format for the quicktime clip from disk....
i went

printf("on load: %f\n", [[mQTMovie tracks] count]);

instead of

printf("on load: %d\n", [[mQTMovie tracks] count]);

which i didn't think would make a difference... maybe i'm too used to java *shudder*...

however, this line

printf("QTGraphics tracks: %d\n", [[mQTGraphics tracks] count]);

prints out 0 tracks....

i think there is something wrong with the way it was initialized but i can't figure out what's wrong...

i initialize it like this:

mQTGraphics = [QTMovie movie];
		[mQTGraphics setAttribute: [NSNumber numberWithBool: YES] forKey: QTMovieEditableAttribute];

that should be fine right? i'm just grabbing an empty QTMovie and making it editable

then i add images to it

NSBitmapImageRep *image = [self getCurrentFrame];
	
	QTTime time = QTMakeTime(100, 10);
	NSDictionary *attrs = [NSDictionary dictionaryWithObject:@"png " forKey:QTAddImageCodecType];
	NSImage *img = [[NSImage alloc] initWithData:[image TIFFRepresentation]];
	
	[mQTMovieExport addImage:img forDuration:time withAttributes:attrs];
	
	[image release];

Surely that should work... it worked for the other QTMovie that was initialized like this:

mQTMovieExport = [[QTMovie alloc] initToWritableFile:[savePanel filename] error:nil];

what's so different about the two methods of initializing that one will add images and the other wont?

 

[yomi.odeleye]

merge two QTMovies together.

Hi Every one. I just want to find out is there a way to join Two or more QTMovies together. If any one knows any line of code that can help me plx let me know. Thank you very much.