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POiOS 5: Error merging 3 videos with AVAssetExportSession
 

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  1. POiOS 5: Error merging 3 videos with AVAssetExportSession
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    <p>I'm trying to merge (append) 3 videos using AVAssetExportSession, but I keep getting this error. Weirdly for 1 or 2 videos it worked.</p> <pre><code>Error Domain=AVFoundationErrorDomain Code=-11820 "Cannot Complete Export" UserInfo=0x458120 {NSLocalizedRecoverySuggestion=Try exporting again., NSLocalizedDescription=Cannot Complete Export} </code></pre> <p>I even tried to redo the function in case of error but what I got is only infinite error message. This is the snippet of my code.</p> <pre><code>AVMutableComposition *mixComposition = [AVMutableComposition composition]; AVMutableCompositionTrack *compositionTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; NSError * error = nil; NSMutableArray * timeRanges = [NSMutableArray arrayWithCapacity:arrayMovieUrl.count]; NSMutableArray * tracks = [NSMutableArray arrayWithCapacity:arrayMovieUrl.count]; for (int i=0; i&lt;[arrayMovieUrl count]; i++) { AVURLAsset *assetClip = [arrayMovieUrl objectAtIndex:i]; AVAssetTrack *clipVideoTrackB = [[assetClip tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]; [timeRanges addObject:[NSValue valueWithCMTimeRange:CMTimeRangeMake(kCMTimeZero, assetClip.duration)]]; [tracks addObject:clipVideoTrackB]; } [compositionTrack insertTimeRanges:timeRanges ofTracks:tracks atTime:kCMTimeZero error:&amp;error]; AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPreset1280x720]; NSParameterAssert(exporter != nil); exporter.outputFileType = AVFileTypeQuickTimeMovie; exporter.outputURL = outputUrl; [exporter exportAsynchronouslyWithCompletionHandler:^{ switch ([exporter status]) { case AVAssetExportSessionStatusFailed: NSLog(@"Export failed: %@", [exporter error]); break; case AVAssetExportSessionStatusCancelled: NSLog(@"Export canceled"); break; case AVAssetExportSessionStatusCompleted: NSLog(@"Export successfully"); break; default: break; } if (exporter.status != AVAssetExportSessionStatusCompleted){ NSLog(@"Retry export"); [self renderMovie]; } }]; </code></pre> <p>Is there something wrong with my code or iOS 5 has some bug?</p>
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