使用AVVideoCompositionCoreAnimationTool和AVAssetExportSession創建視頻SLOW

我使用圖層創建動畫，並且我想用該動畫導出視頻。所以我使用AVAssetExportSession，但它需要很長時間才能導出。使用AVVideoCompositionCoreAnimationTool和AVAssetExportSession創建視頻SLOW

也許我可以使用另一件事？我真的需要幫助！

let videoURL = NSURL.init(fileURLWithPath: "/Users/Downloads/img_2040.mp4") 
    let audioURL = NSURL.init(fileURLWithPath: "/Users/Downloads/music_10sm.m4a") 

    let videoAsset = AVURLAsset.init(url: videoURL as URL) 
    let audioAsset = AVURLAsset.init(url: audioURL as URL) 

    let mixComposition = AVMutableComposition.init() 
    let compositionVideoTrack = mixComposition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid) 
    // let mixCompositionAudio = AVMutableComposition.init() 
    let compositionAudioTrack = mixComposition.addMutableTrack(withMediaType: AVMediaTypeAudio, preferredTrackID: kCMPersistentTrackID_Invalid) 
    // AVAssetTrack video of originalVideo 
    let originalVideoAsset = videoAsset.tracks(withMediaType: AVMediaTypeVideo).first 
    let originalAudioAsset = audioAsset.tracks(withMediaType: AVMediaTypeAudio).first 

    do { 
     try compositionVideoTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAsset.duration), of: originalVideoAsset!, at: kCMTimeZero) 
     compositionVideoTrack.preferredTransform = (videoAsset.tracks(withMediaType: AVMediaTypeVideo).first?.preferredTransform)! 

     try compositionAudioTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, audioAsset.duration), of: originalAudioAsset!, at: kCMTimeZero) 
     compositionAudioTrack.preferredTransform = (audioAsset.tracks(withMediaType: AVMediaTypeAudio).first?.preferredTransform)! 

     let videoSize = originalVideoAsset?.naturalSize 
     let parentLayer = CALayer() 
     let videoLayer = CALayer() 
     parentLayer.bounds = CGRect(x: 0, y: 0, width: (videoSize?.width)!, height: (videoSize?.height)!) 
     parentLayer.position = CGPoint(x: (videoSize?.width)!/2, y: (videoSize?.height)!/2) 
     videoLayer.bounds = CGRect(x: 0, y: 0, width: (videoSize?.width)!, height: (videoSize?.height)!) 
     videoLayer.position = CGPoint(x: (videoSize?.width)!/2 + 20, y: (videoSize?.height)!/2) 
     let layerTest = CALayer() 
     layerTest.bounds = CGRect(x: 0, y: 0, width: 100, height: 100) 
     layerTest.backgroundColor = UIColor.green.cgColor 

     parentLayer.addSublayer(videoLayer) 
     parentLayer.insertSublayer(layerTest, below: videoLayer) 

     // My layer with animations 
     let cubeLayer = cubeAnimation(videoSize: containerLayer.frame.size, isVideo: true) 
     containerLayer.addSublayer(cubeLayer) 

     parentLayer.addSublayer(containerLayer) 
     parentLayer.isGeometryFlipped = true 

     let videoComposition = AVMutableVideoComposition.init() 
     videoComposition.renderSize = videoSize! 
     videoComposition.frameDuration = CMTimeMake(1, 30) 
     videoComposition.animationTool = AVVideoCompositionCoreAnimationTool.init(postProcessingAsVideoLayer: videoLayer, in: parentLayer) 

     // Instruction 
     let instruction = AVMutableVideoCompositionInstruction.init() 
     instruction.timeRange = CMTimeRangeMake(kCMTimeZero, mixComposition.duration) // TEST CAMBIAR ESTA DURATION 
     // Video 
     let videoTrack = mixComposition.tracks(withMediaType: AVMediaTypeVideo).first 
     let layerInstructions = AVMutableVideoCompositionLayerInstruction.init(assetTrack: videoTrack!) 

     instruction.layerInstructions = [layerInstructions] 
     videoComposition.instructions = [instruction] 

     let assetExport = AVAssetExportSession.init(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality) 
     assetExport?.videoComposition = videoComposition 

     let exportPath = "/Users/CarolinaAitcin/Downloads/Test_ScrollBest91.mp4" 
     let exportUrl = URL.init(fileURLWithPath: exportPath) 

     assetExport?.outputFileType = AVFileTypeQuickTimeMovie 
     assetExport?.outputURL = exportUrl 
     assetExport?.shouldOptimizeForNetworkUse = true 

     assetExport?.exportAsynchronously { 
      print("Finish video") 
      print(NSDate()) 
     } 

     Timer.schedule(repeatInterval: 1, handler: { (runTime) in 
      let progress = assetExport?.progress 
      print(progress) 
     }) 
    } catch { 
     print("we have problem") 
    }

來源

2016-12-15 Carol

定義「很長時間」。 CPU（您使用的是Mac或iPhone）對出口時間有影響。動畫的數量和風格也增加了出口時間。作爲一個粗略的經驗法則，任何低於1：1（60秒的視頻需要60秒才能導出）是正確的。大小事項！ 640x360將比1280x720更快。如果您轉移到AVAssetWriter而不是AVAssetExportSession（或使用https://github.com/rs/SDAVAssetExportSession），您還可以自定義Frame和BitRates，這會影響寫入和播放性能。 –

要獲得穩定的基準標記，只需加載和導出視頻，而不進行任何動畫或轉換。這是您的設備可以做的（讀入和寫出）視頻的「最少」工作。嘗試一些不同長度的視頻，並將其用作衡量和評估性能影響的基線。希望這有幫助，祝你好運！ –

當我測試的設備的時間減少了很多的出口，只需要20多歲的我。在模擬器中需要將近2.5分鐘。

來源

2017-01-10 13:52:04 Carol

使用AVVideoCompositionCoreAnimationTool和AVAssetExportSession創建視頻SLOW

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