我正在尝试合并两个视频，其中一个是预先选择的视频，另一个是来自前置摄像头的视频

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如何解决我正在尝试合并两个视频，其中一个是预先选择的视频，另一个是来自前置摄像头的视频？

开发过程中遇到我正在尝试合并两个视频，其中一个是预先选择的视频，另一个是来自前置摄像头的视频的问题如何解决？下面主要结合日常开发的经验，给出你关于我正在尝试合并两个视频，其中一个是预先选择的视频，另一个是来自前置摄像头的视频的解决方法建议，希望对你解决我正在尝试合并两个视频，其中一个是预先选择的视频，另一个是来自前置摄像头的视频有所启发或帮助；

我可以合并两个视频并导出它们，但是我要解决的问题是第二个视频（前置摄像头）轨道的方向/位置取决于第一个。无论第一个视频（用户内容）如何，我都希望能够获得一致的输出

let reactionAsset = AVURLAsset(url: reactionURL!)
    let vIDeoAsset = AVURLAsset(url: vIDeoURL!)
    let composition = AVMutableComposition()
    guard
        let firstTrack = composition.addMutableTrack(withMediaType: .vIDeo,preferredTrackID: kCMPersistentTrackID_InvalID)
        else{
            print("Something is wrong with the asset.")
            onComplete(.failure(dIDNotFinish.dIDNotCompletE))
            return
        }
    print("loaded first track")
    do{
        let timerange = CMTimeRange(start: .zero,duration: vIDeoAsset.duration)
        try firstTrack.insertTimeRange(timerange,of: vIDeoAsset.tracks(withMediaType: .vIDeo)[0],at: .zero)
        print("inserted first timerange")
    }catch{
        print("Failed to load first track")
        onComplete(.failure(dIDNotFinish.dIDNotCompletE))
          return
    }
    guard
        let firstAudTrack = composition.addMutableTrack(withMediaType: .au@R_301_6901@,preferredTrackID: kCMPersistentTrackID_InvalID)
        else{
            print("Something is wrong with the au@R_301_6901@ asset.")
            onComplete(.failure(dIDNotFinish.dIDNotCompletE))
            return
        }
    print("loaded first au@R_301_6901@ track")
    do{
        let timerange = CMTimeRange(start: .zero,duration: vIDeoAsset.duration)
        try firstAudTrack.insertTimeRange(timerange,of: vIDeoAsset.tracks(withMediaType: .au@R_301_6901@)[0],at: .zero)
        print("inserted first au@R_301_6901@ timerange")
    }catch{
        onComplete(.failure(dIDNotFinish.dIDNotCompletE))
        print("Failed to load first au@R_301_6901@ track")
          return
    }
    guard
        let secondTrack = composition.addMutableTrack(withMediaType: .vIDeo,preferredTrackID:  kCMPersistentTrackID_InvalID)
    else{
        print("something is wrong with second asset")
        onComplete(.failure(dIDNotFinish.dIDNotCompletE))
        return
    }
    print("loaded second track")
    do {
        let second_timerange = CMTimeRange(start: .zero,duration: vIDeoAsset.duration)
        print(reactionAsset.tracks)
        try secondTrack.insertTimeRange(second_timerange,of: reactionAsset.tracks(withMediaType: .vIDeo)[0],at: .zero)
        print("inserted second timerange")
    }
    catch{
        print("Failed to load second track")
        onComplete(.failure(dIDNotFinish.dIDNotCompletE))
        return
    }
    guard
        let secondAudTrack = composition.addMutableTrack(withMediaType: .au@R_301_6901@,preferredTrackID:  kCMPersistentTrackID_InvalID)
    else{
        print("something is wrong with second asset")
        onComplete(.failure(dIDNotFinish.dIDNotCompletE))
        return
    }
    print("inserted second aud track")
    do {
        let second_timerange = CMTimeRange(start: .zero,duration: vIDeoAsset.duration)
        try secondAudTrack.insertTimeRange(second_timerange,of: reactionAsset.tracks(withMediaType: .au@R_301_6901@)[0],at: .zero)
        print("added second au@R_301_6901@ time range")
    }
    catch{
        print("Failed to load second track")
        onComplete(.failure(dIDNotFinish.dIDNotCompletE))
        return
    }
    
    let maininstruction = AVMutableVIDeoCompositioninstruction()
    maininstruction.timeRange = CMTimeRange(start: .zero,duration: vIDeoAsset.duration)
    let firstinstruction = AVMutableVIDeoCompositionLayerinstruction(assetTrack: firstTrack)
    let secondinstruction = AVMutableVIDeoCompositionLayerinstruction(assetTrack: secondTrack)
    let scaletransform = CGAffinetransform(scaleX: 0.1,y: 0.1)
    let tranlate = scaletransform.translatedBy(x: 2400,y: 300)
    let rotatetransform = tranlate.rotated(by: .pi/2)
    secondinstruction.settransform(rotatetransform,at: .zero)
    //secondinstruction.settransform(secondTrack.preferredtransform,at: .zero)
    //secondinstruction.setCropRectangle(CGRect(origin: CGPoint(x: 50,y: 50),size: CGSize(wIDth:70,height: 120)),at: .zero)
    //secondinstruction.setCropRectangle(CGRect(x: 200,y: 200,wIDth: 130,height: 180),at: .zero)
    maininstruction.layerinstructions = [secondinstruction,firstinstruction]
    maininstruction.BACkgroundcolor = UIcolor.clear.cgcolor
    let mainComposition = AVMutableVIDeoComposition()
    mainComposition.instructions = [maininstruction]
    mainComposition.frameDuration = CMTimeMake(value: 1,timescale: 30)
    mainComposition.renderSize = CGSize(wIDth: firstTrack.naturalSize.wIDth,height: firstTrack.naturalSize.height)
    let tempurl = tempuRLWithmp4Extension()
    guard let export = AVAssetExportSession(asset: composition,presetname: AVAssetExportPresetHighestQuality)
    else{
        onComplete(.failure(dIDNotFinish.dIDNotCompletE))
        return
    }

我想要的结果看起来像这样

解决方法

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