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I'm writing an application that works with video using AVFoundation. The behaviour of my application is simple: I take a video from the camera roll, then I create an AVMutableComposition with some audio tracks. With the mix composition i initialize an AVAssetExportSession that stores the video file in the documents directory of my app. Until this point everything it's ok: my video is stored and I'm able to play it in another controller. If I take the video that i have just stored in my documents folder to make some editing (in the same way of the first time AVmutableComposition, AVAssetExportSession) it's ok again. But the third time I do this process to editing a video the AVAssetExportSession status becomes "Fail" and with this error: "Domain=AVFoundationErrorDomain Code=-11820 "Cannot Complete Export" UserInfo=0x1a9260 {NSLocalizedRecoverySuggestion=Try exporting again., NSLocalizedDescription=Cannot Complete Export}" I have read that is a general error where the session couldn't be exported. What is the sense of this? Why only the third time that i made the editing process? Could it be a memory management mistake? A bug?. This is the code of my AVAssetExportSession: _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality]; _assetExport.shouldOptimizeForNetworkUse = YES; ///data odierna NSDateFormatter *format = [[NSDateFormatter alloc] init]; [format setDateFormat:@"ddMMyyyyHHmmss"]; NSDate *now = [[NSDate alloc] init]; NSString *dateString = [format stringFromDate:now]; [now release]; [format release]; NSString* ext = @".MOV"; NSString* videoName=[NSString stringWithFormat:@"%@%@", dateString, ext]; ///data odierna NSString *exportPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:videoName]; if ([[NSFileMan

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