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POAVVideoComposition Failure
 

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    <p>As in mine. To use it.</p> <p>I am string several different video clips together into an AVMutableComposition and attempting to correct their orientation if needed.</p> <p>Here is my code:</p> <pre><code>composition = [[AVMutableComposition alloc] init]; AVMutableVideoComposition *videoComposition = [AVMutableVideoComposition videoComposition]; AVMutableCompositionTrack *compositionVideoTrack = [composition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; AVMutableCompositionTrack *compositionAudioTrack = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid]; CMTime nextClipStartTime = kCMTimeZero; // orientation compensation vars AVMutableVideoCompositionInstruction *inst = [AVMutableVideoCompositionInstruction videoCompositionInstruction]; NSMutableArray *compInst = [[NSMutableArray alloc] init]; // get view size CGSize viewSize = playerView.frame.size; // generate movie assets for (NSString* moviePath in [currentBlam valueForKey:@"movies"]) { NSURL *movieURL = [NSURL fileURLWithPath:moviePath]; AVURLAsset *movieAsset = [AVURLAsset URLAssetWithURL:movieURL options:nil]; // scale asset to fit screen CMTimeRange tr = CMTimeRangeFromTimeToTime(CMTimeMakeWithSeconds(0.0f, 1), CMTimeMakeWithSeconds(0.0f, 1)); // create video track AVAssetTrack *clipVideoTrack = [[movieAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]; // create audio track AVAssetTrack *clipAudioTrack = [[movieAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0]; tr = CMTimeRangeFromTimeToTime(CMTimeMakeWithSeconds(0.0f, 1), CMTimeMakeWithSeconds(CMTimeGetSeconds([movieAsset duration]), 1)); AVMutableVideoCompositionLayerInstruction *layerInst; layerInst = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:clipVideoTrack]; int or = [self orientationForTrack:movieAsset]; if (or==1) { float rot = (0.0f); [layerInst setTransform:CGAffineTransformMakeRotation(rot) atTime:nextClipStartTime]; } else if (or==2) { float rot = (M_PI); [layerInst setTransform:CGAffineTransformMakeRotation(rot) atTime:nextClipStartTime]; } else if (or==3) { float rot = (M_PI*-0.5f); [layerInst setTransform:CGAffineTransformMakeRotation(rot) atTime:nextClipStartTime]; } else if (or==4) { float rot = (M_PI*0.5f); [layerInst setTransform:CGAffineTransformMakeRotation(rot) atTime:nextClipStartTime]; } [layerInst setTransform:clipVideoTrack.preferredTransform atTime:nextClipStartTime]; [compInst addObject:layerInst]; // insert video track [compositionVideoTrack insertTimeRange:tr ofTrack:clipVideoTrack atTime:nextClipStartTime error:nil]; // insert audio track [compositionAudioTrack insertTimeRange:tr ofTrack:clipAudioTrack atTime:nextClipStartTime error:nil]; nextClipStartTime = CMTimeAdd(nextClipStartTime, tr.duration); } //set size and duration composition.naturalSize = viewSize; videoComposition.frameDuration = composition.duration; videoComposition.renderSize = viewSize; videoComposition.renderScale = 1.0f; //apply instructions inst.timeRange = CMTimeRangeMake(kCMTimeZero, composition.duration); inst.layerInstructions = compInst; videoComposition.instructions = [NSArray arrayWithObject:inst]; playerItem = [[AVPlayerItem alloc] initWithAsset:composition]; playerItem.videoComposition = videoComposition; [playerItem addObserver:self forKeyPath:@"status" options:0 context:&amp;ItemStatusContext]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playerItemDidReachEnd:) name:AVPlayerItemDidPlayToEndTimeNotification object:playerItem]; player = [AVPlayer playerWithPlayerItem:playerItem]; [playerView setPlayer:player]; </code></pre> <p>When I run this and populate with content nothing shows.</p> <p>This was working previously without the AVVideoComposition being applied to the player. In fact, commenting out the playerItem.videoComposition = videoComposition allows it to work, albeit without correcting the assets rotations.</p> <p>At this point I know I'm just misunderstanding something here. Can someone please point out what?</p>
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    1. COI will followup and say that I know the video can still play. The sound plays and the scrubbing slider advance properly. I'm just not seeing anything in the video.
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