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POException error trying to merge videos with AVMutableComposition: "objects cannot be nil"... but they don't appear to be nil?
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  1. POException error trying to merge videos with AVMutableComposition: "objects cannot be nil"... but they don't appear to be nil?
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    copied!<p>My brain feels like scrambled eggs... I'm trying to merge video clips together. I have each clip URL stored in an NSMutableArray (arrayClipURL) &amp; that's all good. When I print timeRanges &amp; tracks (both NSMutableArrays) in debug console, everything checks out, which means for loop is doing its job. I keep getting an exception error: '<em>*</em> -[__NSArrayM insertObject:atIndex:]: object cannot be nil'. </p> <p>I threw in an exception breakpoint and its breaking at the last line below. I cant figure it out because both timeRanges and tracks are NOT nil... I can print them in the debug console and see them just fine directly before the line that breaks. </p> <pre><code>composition = [[AVMutableComposition composition] init]; composedTrack = [[AVMutableCompositionTrack alloc] init]; composedTrack = [composition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; NSMutableArray * timeRanges = [[NSMutableArray alloc] initWithCapacity:arrayClipURL.count]; NSMutableArray * tracks = [[NSMutableArray alloc] initWithCapacity:arrayClipURL.count]; for (int i=0; i&lt;[arrayClipURL count]; i++){ AVURLAsset *assetClip = [[AVURLAsset alloc] initWithURL:[arrayClipURL objectAtIndex:i] options:nil]; AVAssetTrack *clipTrack = [[AVAssetTrack alloc] init]; clipTrack = [[assetClip tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]; [timeRanges addObject:[NSValue valueWithCMTimeRange:CMTimeRangeMake(kCMTimeZero, assetClip.duration)]]; [tracks addObject:clipTrack]; } debug(@"timeranges: %@",timeRanges); debug(@"tracks: %@",tracks); [composedTrack insertTimeRanges:timeRanges ofTracks:tracks atTime:kCMTimeZero error:nil]; </code></pre> <p>I am in need of some veteran assistance :( Any idea what could be causing the problem?</p> <p>Edit: Here are how the 2 arrays look printed in the console. The only thing I can think of is maybe the CMTimeRange or AVAssetTrack aren;t formatted properly in the arrays??? i have no idea. Just thought it might help to see what it's actually trying to insert when the exception is thrown.</p> <pre><code> 2013-02-18 13:18:20.811 app[5242:907] [AVCaptureManager.m:401] timeranges array: ( "CMTimeRange: {{0/1 = 0.000}, {498/600 = 0.830}}", "CMTimeRange: {{0/1 = 0.000}, {556/600 = 0.927}}" ) 2013-02-18 13:18:20.812 app[5242:907] [AVCaptureManager.m:402] tracks array: ( "&lt;AVAssetTrack: 0x220c21a0, trackID = 1, mediaType = vide&gt;", "&lt;AVAssetTrack: 0x1cdec820, trackID = 1, mediaType = vide&gt;" ) </code></pre>
 

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