[SWIFT] AudioMixInputParameters AVFoundation를 사용하여 각 비디오 트랙에 여러 볼륨을 설정하면 스위프트 아이폰 OS에서 작동하지 않습니다

AudioMixInputParameters AVFoundation를 사용하여 각 비디오 트랙에 여러 볼륨을 설정하면 스위프트 아이폰 OS에서 작동하지 않습니다

해결법

1. ---

   1.여기에 내 질문에 대한 작업 솔루션입니다 :

   여기에 내 질문에 대한 작업 솔루션입니다 :

   func addVolumeToIndividualVideoClip(_ assetURL: URL, video: VideoFileModel, completion : ((_ session: AVAssetExportSession?, _ outputURL : URL?) -> ())?){
   
           //Create Asset from Url
           let filteredVideoAsset: AVAsset = AVAsset(url: assetURL)
   
           video.fileID = String(video.videoID)
   
           //Get the path of App Document Directory
           let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
   
           let url = URL(fileURLWithPath: documentDirectory).appendingPathComponent("\(video.fileID)_\("FilterVideo").mov")
   
           let filePath = url.path
           let fileManager = FileManager.default
   
           do {
               if fileManager.fileExists(atPath: filePath) {
                   print("FILE AVAILABLE")
                   try fileManager.removeItem(atPath:filePath)
               } else {
                   print("FILE NOT AVAILABLE")
               }
           } catch _ {
           }
   
   
           let composition: AVMutableComposition = AVMutableComposition()
           let compositionVideo: AVMutableCompositionTrack = composition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: CMPersistentTrackID())
           let compositionAudioVideo: AVMutableCompositionTrack = composition.addMutableTrack(withMediaType: AVMediaTypeAudio, preferredTrackID: CMPersistentTrackID())
   
   
           //Add video to the final record
           do {
                try compositionVideo.insertTimeRange(CMTimeRangeMake(kCMTimeZero, filteredVideoAsset.duration), of: filteredVideoAsset.tracks(withMediaType: AVMediaTypeVideo)[0], at: kCMTimeZero)
           } catch _ {
           }
   
           //Extract audio from the video and the music
           let audioMix: AVMutableAudioMix = AVMutableAudioMix()
           var audioMixParam: [AVMutableAudioMixInputParameters] = []
   
           let assetVideoTrack: AVAssetTrack = filteredVideoAsset.tracks(withMediaType: AVMediaTypeAudio)[0]
   
           let videoParam: AVMutableAudioMixInputParameters = AVMutableAudioMixInputParameters(track: assetVideoTrack)
           videoParam.trackID = compositionAudioVideo.trackID
   
           //Set final volume of the audio record and the music
           videoParam.setVolume(video.videoVolume, at: kCMTimeZero)
   
           //Add setting
           audioMixParam.append(videoParam)
   
           //Add audio on final record
           //First: the audio of the record and Second: the music
           do {
               try compositionAudioVideo.insertTimeRange(CMTimeRangeMake(kCMTimeZero, filteredVideoAsset.duration), of: assetVideoTrack, at: kCMTimeZero)
           } catch _ {
               assertionFailure()
           }
   
           //Fading volume out for background music
           let durationInSeconds = CMTimeGetSeconds(filteredVideoAsset.duration)
   
           let firstSecond = CMTimeRangeMake(CMTimeMakeWithSeconds(0, 1), CMTimeMakeWithSeconds(1, 1))
           let lastSecond = CMTimeRangeMake(CMTimeMakeWithSeconds(durationInSeconds-1, 1), CMTimeMakeWithSeconds(1, 1))
   
           videoParam.setVolumeRamp(fromStartVolume: 0, toEndVolume: video.videoVolume, timeRange: firstSecond)
           videoParam.setVolumeRamp(fromStartVolume: video.videoVolume, toEndVolume: 0, timeRange: lastSecond)
   
           //Add parameter
           audioMix.inputParameters = audioMixParam
   
           //Remove the previous temp video if exist
           let filemgr = FileManager.default
           do {
               if filemgr.fileExists(atPath: "\(video.fileID)_\("FilterVideo").mov") {
                   try filemgr.removeItem(atPath: "\(video.fileID)_\("FilterVideo").mov")
               } else {
               }
           } catch _ {
           }
   
           //Exporte the final record’
           let exporter: AVAssetExportSession = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetHighestQuality)!
           exporter.outputURL = url
           exporter.outputFileType = AVFileTypeMPEG4
           exporter.audioMix = audioMix
   
           exporter.exportAsynchronously(completionHandler: { () -> Void in
               completion!(exporter, url)
   
              // self.saveVideoToLibrary(from: filePath)
           })
       }
   

2. ---

   2.나는 AVAssetExportPresetPassthrough의 사전 설정과 자산을 수출하는 출력 볼륨에 영향이없는 것을 발견했다. 내가 AVAssetExportPresetLowQuality을 사용하려고 할 때, 볼륨 변경은 성공적으로 적용.

   나는 AVAssetExportPresetPassthrough의 사전 설정과 자산을 수출하는 출력 볼륨에 영향이없는 것을 발견했다. 내가 AVAssetExportPresetLowQuality을 사용하려고 할 때, 볼륨 변경은 성공적으로 적용.

   나는 그것이 더 나은 문서화 어딘가에 할 :(

   작업 코드 :

   // Assume we have:
   let composition: AVMutableComposition
   var inputParameters = [AVAudioMixInputParameters]()
   
   // We add a track
   let trackComposition = composition.addMutableTrack(...)
   
   // Configure volume for this track
   let inputParameter = AVMutableAudioMixInputParameters(track: trackComposition)
   inputParameter.setVolume(desiredVolume, at: startTime)
   
   // It works even without setting the `trackID`
   // inputParameter.trackID = trackComposition.trackID
   
   inputParameters.append(inputParameter)
   
   // Apply gathered `inputParameters` before exporting
   let audioMix = AVMutableAudioMix()
   audioMix.inputParameters = inputParameters
   
   // I found it's not working, if using `AVAssetExportPresetPassthrough`,
   // so try `AVAssetExportPresetLowQuality` first
   let export = AVAssetExportSession(..., presetName: AVAssetExportPresetLowQuality)
   export.audioMix = audioMix
   

   각각의 삽입을위한 다른 볼륨 설정 compositionTrack 같은 여러 assetTrack 삽입, 이것을 테스트 하였다. 작동하는 것 같다.

from https://stackoverflow.com/questions/54804888/setting-multiple-volumes-to-each-video-tracks-using-audiomixinputparameters-avfo by cc-by-sa and MIT license