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我使用下面的代碼在視頻上添加圖像水印，但結果視頻的幀旋轉了180度，我嘗試了所有可能的解決方案來阻止它。我只是想與水印視頻相同的視頻。請提出解決方案。添加一個圖像作爲水印上的視頻結果倒視頻
-(void)watermarkVideoAtURL:(NSURL *)url fb:(BOOL)fb withCompletionHandler:(void(^)(bool success, NSURL *assetsURL, NSError *error))completionHandler {
AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:url options:nil];
AVMutableComposition *mixComposition = [AVMutableComposition composition];
AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *clipVideoTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] lastObject];
AVMutableCompositionTrack *compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *clipAudioTrack = [[videoAsset tracksWithMediaType:AVMediaTypeAudio] lastObject];
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) ofTrack:clipVideoTrack atTime:kCMTimeZero error:nil];
[compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) ofTrack:clipAudioTrack atTime:kCMTimeZero error:nil];
[compositionVideoTrack setPreferredTransform:[[[videoAsset tracksWithMediaType:AVMediaTypeVideo] lastObject] preferredTransform]];
CGSize sizeOfVideo = [videoAsset naturalSize];
CALayer *parentLayer = [CALayer layer];
CALayer *videoLayer = [CALayer layer];
parentLayer.frame = CGRectMake(0, 0, sizeOfVideo.width, sizeOfVideo.height);
videoLayer.frame = CGRectMake(0, 0, sizeOfVideo.width, sizeOfVideo.height);
// Image of watermark
UIImage *myImage = [self imageByApplyingAlpha:watermarkOpacityFactor toImage:[UIImage imageNamed:@"iconbig"]];
CALayer *layerCa = [CALayer layer];
layerCa.contents = (id)myImage.CGImage;
layerCa.frame = CGRectMake(10, sizeOfVideo.height - 50, 50, 50);
layerCa.opacity = 1.0;
CALayer *layerCa2 = [CALayer layer];
layerCa2.contents = (id)myImage.CGImage;
layerCa2.frame = CGRectMake(sizeOfVideo.width - 60, 10, 50, 50);
layerCa2.opacity = 1.0;
[parentLayer addSublayer:videoLayer];
[parentLayer addSublayer:layerCa];
[parentLayer addSublayer:layerCa2];
AVMutableVideoComposition *videoComposition = [AVMutableVideoComposition videoComposition];
videoComposition.frameDuration = CMTimeMake(1, 30);
videoComposition.renderSize = sizeOfVideo;
videoComposition.animationTool = [AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer];
AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, [mixComposition duration]);
AVAssetTrack *videoTrack = [[mixComposition tracksWithMediaType:AVMediaTypeVideo] lastObject];
AVMutableVideoCompositionLayerInstruction *layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack];
instruction.layerInstructions = [NSArray arrayWithObject:layerInstruction];
videoComposition.instructions = [NSArray arrayWithObject:instruction];
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd_HH-mm-ss"];
NSString *destinationPath = [documentsDirectory stringByAppendingFormat:@"/utput_%@.mov", [dateFormatter stringFromDate:[NSDate date]]];
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality];
exportSession.videoComposition = videoComposition;
exportSession.outputURL = [NSURL fileURLWithPath:destinationPath];
exportSession.outputFileType = AVFileTypeQuickTimeMovie;
[exportSession exportAsynchronouslyWithCompletionHandler:^{
switch (exportSession.status) {
case AVAssetExportSessionStatusCompleted: {
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library writeVideoAtPathToSavedPhotosAlbum:exportSession.outputURL completionBlock:^(NSURL *assetURL, NSError *error) {
if (!error) {
completionHandler(YES, assetURL, nil);
} else {
completionHandler(NO, nil, error);
}
}];
}
break;
case AVAssetExportSessionStatusFailed: {
completionHandler(NO, nil, exportSession.error);
}
break;
case AVAssetExportSessionStatusCancelled: {
completionHandler(NO, nil, exportSession.error);
}
break;
default:
break;
}
}];
}