我用前置摄像头录制了一段视频,输出镜像了......
我尝试使用AVMutablecomposition
和layerinstructions
翻转视频,但没有运气。
谷歌搜索和搜索Stack Overflow一直没有结果,所以我打赌一个简单,直接的例子,说明如何做到这一点会使许多人受益。
答案 0 :(得分:14)
没有迹象表明您使用什么录制视频,生病假设为AVCaptureSession
+ AVCaptureVideoDataOutput
lazy var videoFileOutput: AVCaptureVideoDataOutput = AVCaptureVideoDataOutput()
let v = videoFileOutput.connectionWithMediaType(AVMediaTypeVideo)
v.videoOrientation = .Portrait
v.videoMirrored = true
答案 1 :(得分:7)
您可以使用-[AVMutableVideoCompositionLayerInstruction setTransform:atTime:]
CGAffineTransform transform = CGAffineTransformMakeTranslation(self.config.videoSize, 0);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
[videoCompositionLayerInstruction setTransform:transform atTime:videoTime];
// then append video tracks
// [compositionTrack insertTimeRange:timeRange ofTrack:track atTime:atTime error:&error];
// apply instructions
videoCompositionInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, composition.duration);
videoCompositionInstruction.layerInstructions = @[videoCompositionLayerInstruction];
videoComposition = [AVMutableVideoComposition videoComposition];
videoComposition.renderSize = CGSizeMake(self.config.videoSize, self.config.videoSize);
videoComposition.frameDuration = CMTimeMake(1, self.config.videoFrameRate);
videoComposition.instructions = @[videoCompositionInstruction];
https://github.com/ElfSundae/AVDemo/tree/ef2ca437d0d8dcb3dd41c5a272c8754a29d8a936/AVSimpleEditoriOS
出口构成:
AVAssetExportSession *exportSession = [AVAssetExportSession exportSessionWithAsset:composition presetName:presetName];
exportSession.outputFileType = AVFileTypeMPEG4;
exportSession.outputURL = outputURL;
exportSession.shouldOptimizeForNetworkUse = YES;
// videoComposition contains transform instructions for video tracks
exportSession.videoComposition = videoComposition;
// audioMix contains background music for audio tracks
exportSession.audioMix = audioMix;
[exportSession exportAsynchronouslyWithCompletionHandler:^{
AVAssetExportSessionStatus status = exportSession.status;
if (status != AVAssetExportSessionStatusCompleted) {
// exportSession.error
} else {
// exportSession.outputURL
}
}];
答案 2 :(得分:1)
快捷键5 。 AVCaptureSession:
let movieFileOutput = AVCaptureMovieFileOutput()
let connection = movieFileOutput.connection(with: .video)
if connection?.isVideoMirroringSupported ?? false {
connection?.isVideoMirrored = true
}
与PhotoOutput相同。
答案 3 :(得分:0)
在您的输出转换视频后
func mirrorVideo(inputURL: URL, completion: @escaping (_ outputURL : URL?) -> ())
{
let videoAsset: AVAsset = AVAsset( url: inputURL )
let clipVideoTrack = videoAsset.tracks( withMediaType: AVMediaType.video ).first! as AVAssetTrack
let composition = AVMutableComposition()
composition.addMutableTrack(withMediaType: AVMediaType.video, preferredTrackID: CMPersistentTrackID())
let videoComposition = AVMutableVideoComposition()
videoComposition.renderSize = CGSize(width: clipVideoTrack.naturalSize.height, height: clipVideoTrack.naturalSize.width)
videoComposition.frameDuration = CMTimeMake(1, 30)
let transformer = AVMutableVideoCompositionLayerInstruction(assetTrack: clipVideoTrack)
let instruction = AVMutableVideoCompositionInstruction()
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, CMTimeMakeWithSeconds(60, 30))
var transform:CGAffineTransform = CGAffineTransform(scaleX: -1.0, y: 1.0)
transform = transform.translatedBy(x: -clipVideoTrack.naturalSize.width, y: 0.0)
transform = transform.rotated(by: CGFloat(Double.pi/2))
transform = transform.translatedBy(x: 0.0, y: -clipVideoTrack.naturalSize.width)
transformer.setTransform(transform, at: kCMTimeZero)
instruction.layerInstructions = [transformer]
videoComposition.instructions = [instruction]
// Export
let exportSession = AVAssetExportSession(asset: videoAsset, presetName: AVAssetExportPreset640x480)!
let fileName = UniqueIDGenerator.generate().appending(".mp4")
let filePath = documentsURL.appendingPathComponent(fileName)
let croppedOutputFileUrl = filePath
exportSession.outputURL = croppedOutputFileUrl
exportSession.outputFileType = AVFileType.mp4
exportSession.videoComposition = videoComposition
exportSession.exportAsynchronously {
if exportSession.status == .completed {
DispatchQueue.main.async(execute: {
completion(croppedOutputFileUrl)
})
return
} else if exportSession.status == .failed {
print("Export failed - \(String(describing: exportSession.error))")
}
completion(nil)
return
}
}