videoAtPathIsCompatibleWithSavedPhotosAlbum:NOなmp4のカメラロール保存

AVAssetExportSessionでcompatible:NOのmp4をcompatible:YESなmp4にexportする

- (void) saveMovie{
	NSString* tempPath=[[NSBundle mainBundle] pathForResource:@"test" ofType:@"mp4"];
    NSURL *url = [NSURL fileURLWithPath:tempPath];

	AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset: [AVURLAsset URLAssetWithURL:url options:nil] presetName:AVAssetExportPresetMediumQuality];
    exporter.outputURL=[NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:@"test.mp4"]];
    exporter.outputFileType = AVFileTypeMPEG4;
   
    [exporter exportAsynchronouslyWithCompletionHandler:^
     {
         dispatch_async(dispatch_get_main_queue(), ^{
             [self exportDidFinish:exporter];
         });
     }];
}

- (void)exportDidFinish:(AVAssetExportSession*)session
{
    NSURL *outputURL = session.outputURL;
    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
       
    if ([library videoAtPathIsCompatibleWithSavedPhotosAlbum:outputURL]) {
        [library writeVideoAtPathToSavedPhotosAlbum:outputURL
                                    completionBlock:^(NSURL *assetURL, NSError *error){
                                        dispatch_async(dispatch_get_main_queue(), ^{
                                            if (error) {
                                                NSLog(@"Error: %@", error);
                                            }else{
                                                NSLog(@"success!");
                                            }
                                           
                                        });
                                       
                                    }];
    }else{
        NSLog(@"no compatible");
    }
}