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从最近 2 天开始,我一直在为 AVMutableCompositionTrack
挠头,在我的例子中,它拍摄的是纵向视频,但在添加水印后它变成了横向。
这是我的代码:
AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:[[NSBundle mainBundle] URLForResource:@"Sample" withExtension:@".mp4"] options:nil];
AVMutableComposition* mixComposition = [AVMutableComposition composition];
AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *clipVideoTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration)
ofTrack:clipVideoTrack
atTime:kCMTimeZero error:nil];
[compositionVideoTrack setPreferredTransform:[videoAsset preferredTransform]];
//WaterMark
UIImage *waterMark = [UIImage imageWithContentsOfFile:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Sample.jpg"]];
CALayer *waterMarkLayer = [CALayer layer];
[waterMarkLayer setContents:(id)[waterMark CGImage]];
[waterMarkLayer setFrame:CGRectMake(30, 30, 100, 40)] ;
[waterMarkLayer setOpacity:0.8] ;
CGSize videoSize = [[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] naturalSize];
CALayer *parentLayer = [CALayer layer];
CALayer *videoLayer = [CALayer layer];
[parentLayer setFrame:CGRectMake(0, 0, videoSize.width, videoSize.height)];
[videoLayer setFrame:CGRectMake(0, 0, videoSize.width, videoSize.height)];
[parentLayer addSublayer:videoLayer];
[parentLayer addSublayer:waterMarkLayer];
//Instruction
AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
[instruction setTimeRange:CMTimeRangeMake(kCMTimeZero, [mixComposition duration])];
AVAssetTrack *videoTrack = [[mixComposition tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
AVMutableVideoCompositionLayerInstruction* layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack];
[instruction setLayerInstructions:[NSArray arrayWithObject:layerInstruction]];
AVMutableVideoComposition *videoComp = [AVMutableVideoComposition videoComposition] ;
[videoComp setRenderSize:videoSize];
[videoComp setFrameDuration:CMTimeMake(1, 30)];
[videoComp setAnimationTool:[AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer]];
[videoComp setInstructions:[NSArray arrayWithObject:instruction]];
//Exporting File
NSString *fullMoviePath = [NSTemporaryDirectory() stringByAppendingPathComponent:[@"WaterMarkedMovie" stringByAppendingPathExtension:@"mp4"]];
NSURL *finalVideoFileURL = [NSURL fileURLWithPath:fullMoviePath];
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality];
[exportSession setOutputFileType:AVFileTypeMPEG4];
[exportSession setOutputURL:finalVideoFileURL];
[exportSession setVideoComposition:videoComp];
[exportSession exportAsynchronouslyWithCompletionHandler:^{
switch ([exportSession status])
{
case AVAssetExportSessionStatusFailed:
{
NSLog(@"Export Failed: %@ %@", [[exportSession error] localizedDescription], [[exportSession error] debugDescription]);
[[NSFileManager defaultManager] removeItemAtURL:[exportSession outputURL] error:nil];
break ;
}
case AVAssetExportSessionStatusCancelled:
{
NSLog(@"Export Cancel: %@ %@", [[exportSession error] localizedDescription], [[exportSession error] debugDescription]);
[[NSFileManager defaultManager] removeItemAtURL:[exportSession outputURL] error:nil];
break ;
}
case AVAssetExportSessionStatusCompleted:
{
NSLog(@"Export Complete!");
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
if (status == PHAuthorizationStatusAuthorized)
{
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
[PHAssetChangeRequest creationRequestForAssetFromVideoAtFileURL:[exportSession outputURL]];
} completionHandler:^(BOOL success, NSError *error) {
[[NSFileManager defaultManager] removeItemAtURL:[exportSession outputURL] error:nil];
if (success)
{
NSLog(@"Success");
}
}];
}
else
{
NSLog(@"Not Authorised");
[[NSFileManager defaultManager] removeItemAtURL:[exportSession outputURL] error:nil];
}
}];
break ;
}
default : NSLog(@"Default") ;
}
}];
我已经尝试了所有看起来重复的问题,但 Stackoverflow 的解决方案对我没有用。
我必须保持其横向。我什至尝试在 compositionVideoTrack
和 layerInstruction
上设置转换,但它们都没有帮助我。
任何建议都会有所帮助。 :)
最佳答案
最后,我得到了解决方案,parentLayer
和 videoLayer
的大小造成了问题。随着 render.renderSize
和 layerInstruction
转换需要更改。这是代码:
AVURLAsset *videoAsset = [[AVURLAsset alloc]initWithURL:[[NSBundle mainBundle] URLForResource:@"Sample" withExtension:@".mp4"] options:nil];
AVMutableComposition* mixComposition = [AVMutableComposition composition];
AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *clipVideoTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration)
ofTrack:clipVideoTrack
atTime:kCMTimeZero error:nil];
//WaterMark
UIImage *waterMark = [UIImage imageWithContentsOfFile:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Sample.jpg"]];
CALayer *waterMarkLayer = [CALayer layer];
[waterMarkLayer setContents:(id)[waterMark CGImage]];
[waterMarkLayer setFrame:CGRectMake(30, 30, 100, 40)] ;
[waterMarkLayer setOpacity:0.8] ;
AVAssetTrack *assetVideoTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] ;
CGSize videoSize = [assetVideoTrack naturalSize];
CALayer *parentLayer = [CALayer layer];
CALayer *videoLayer = [CALayer layer];
[parentLayer setFrame:CGRectMake(0, 0, videoSize.height, videoSize.width)];
[videoLayer setFrame:CGRectMake(0, 0, videoSize.height, videoSize.width)];
[parentLayer addSublayer:videoLayer];
[parentLayer addSublayer:waterMarkLayer];
//Instruction
AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
[instruction setTimeRange:CMTimeRangeMake(kCMTimeZero, [mixComposition duration])];
AVAssetTrack *videoTrack = [[mixComposition tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
AVMutableVideoCompositionLayerInstruction* layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack];
CGAffineTransform t1 = CGAffineTransformMakeTranslation(videoSize.height, 0);
CGAffineTransform t2 = CGAffineTransformRotate(t1, degreesToRadians(90.0));
[layerInstruction setTransform:t2 atTime:kCMTimeZero];
[instruction setLayerInstructions:[NSArray arrayWithObject:layerInstruction]];
AVMutableVideoComposition *videoComp = [AVMutableVideoComposition videoComposition] ;
[videoComp setRenderSize:CGSizeMake(videoSize.height, videoSize.width)];
[videoComp setFrameDuration:CMTimeMake(1, 30)];
[videoComp setAnimationTool:[AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer]];
[videoComp setInstructions:[NSArray arrayWithObject:instruction]];
//Exporting File
NSString *fullMoviePath = [NSTemporaryDirectory() stringByAppendingPathComponent:[@"WaterMarkedMovie" stringByAppendingPathExtension:@"mp4"]];
NSURL *finalVideoFileURL = [NSURL fileURLWithPath:fullMoviePath];
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality];
[exportSession setOutputFileType:AVFileTypeMPEG4];
[exportSession setOutputURL:finalVideoFileURL];
[exportSession setVideoComposition:videoComp];
[exportSession exportAsynchronouslyWithCompletionHandler:^{
switch ([exportSession status])
{
case AVAssetExportSessionStatusFailed:
{
NSLog(@"Export Failed: %@ %@", [[exportSession error] localizedDescription], [[exportSession error] debugDescription]);
[[NSFileManager defaultManager] removeItemAtURL:[exportSession outputURL] error:nil];
break ;
}
case AVAssetExportSessionStatusCancelled:
{
NSLog(@"Export Cancel: %@ %@", [[exportSession error] localizedDescription], [[exportSession error] debugDescription]);
[[NSFileManager defaultManager] removeItemAtURL:[exportSession outputURL] error:nil];
break ;
}
case AVAssetExportSessionStatusCompleted:
{
NSLog(@"Export Complete!");
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
if (status == PHAuthorizationStatusAuthorized)
{
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
[PHAssetChangeRequest creationRequestForAssetFromVideoAtFileURL:[exportSession outputURL]];
} completionHandler:^(BOOL success, NSError *error) {
[[NSFileManager defaultManager] removeItemAtURL:[exportSession outputURL] error:nil];
if (success)
{
NSLog(@"Success");
}
}];
}
else
{
NSLog(@"Not Authorised");
[[NSFileManager defaultManager] removeItemAtURL:[exportSession outputURL] error:nil];
}
}];
break ;
}
default : NSLog(@"Default") ;
}
}];
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