비디오 자르기 방법?

Question

특정 부분에서 비디오를 잘라내려고합니다. 높이, 너비, x 및 y가 주어지면 비디오의 특정 영역을 자르고 싶습니다. 아무도 아이디어가 없습니다.

나는 많은 연구를했지만 결실을 맺지 못했습니다. GPUImage Cropfilter를 사용하여 자르기를 시도했지만 너무 많은 시간이 걸립니다.

최대한 빨리이 작업을 수행하고 싶습니다. 수행 방법이나 예제를 제안 해주세요. 사전에 감사

Answer 1

당신은 AVMutableComposition 더 상세 방문 사과의 참조 라이브러리 AVMutableComposition Class Reference 및 AVAssetExportSession Class Reference

AVAsset* asset = // Create your asset with source video url 

AVMutableComposition *videoComposition = [AVMutableComposition composition]; 

AVMutableCompositionTrack *compositionVideoTrack = [videoComposition    addMutableTrackWithMediaType:AVMediaTypeVideo  preferredTrackID:kCMPersistentTrackID_Invalid]; 

AVAssetTrack *clipVideoTrack = [[asset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]; 

AVMutableVideoComposition* videoComposition = [[AVMutableVideoComposition videoComposition]retain]; 
videoComposition.renderSize = CGSizeMake(320, 240); 
videoComposition.frameDuration = CMTimeMake(1, 30); 

AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction]; 
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, CMTimeMakeWithSeconds(60, 30)); 

AVMutableVideoCompositionLayerInstruction* transformer = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:clipVideoTrack]; 
CGAffineTransform finalTransform = // setup a transform that grows the video, effectively causing a crop 
[transformer setTransform:finalTransform atTime:kCMTimeZero]; 
instruction.layerInstructions = [NSArray arrayWithObject:transformer]; 
videoComposition.instructions = [NSArray arrayWithObject: instruction]; 

CGSize videoSize = myVideoComposition.renderSize; 

CALayer *parentLayer = [CALayer layer]; 

CALayer *videoLayer = [CALayer layer]; 

NSLog(@"%f %f",_playerLayer.frame.origin.x,_playerLayer.frame.size.width); 

parentLayer.frame = CGRectMake(0, 0 , cropsize.x , cropsize.y); 

[videoLayer setPosition:CGPointMake(videoLayer.position.x, videoSize.height)]; 

[parentLayer addSublayer:videoLayer]; 


videoComposition.animationTool = [AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer]; 

exporter = [[AVAssetExportSession alloc] initWithAsset:saveComposition presetName:AVAssetExportPresetHighestQuality] ; 
exporter.videoComposition = videoComposition; 
exporter.outputURL=url3; 
exporter.outputFileType=AVFileTypeQuickTimeMovie; 

[exporter exportAsynchronouslyWithCompletionHandler:^(void){}];