我正在 Swift
中开发基于Video
的Application
。根据要求,我必须从 Device Gallery
中选择多个 Videos
,设置不同的 CIFilter
效果和 Volume
对于每个 Video Asset
,然后合并所有 Videos
并且必须保存 Final Video
。作为输出,当我播放 Final Video
时,Video
声音 volume
应该相应地改变。
我已经将所有选定的 Video Assets
合并到一个具有不同 CIFilter
效果的文件中,但我的问题是当我尝试设置 Volume
对于每个 Video Clips
然后它不工作。我正在为我的 Final Video
使用默认的 Volume
。这是我的代码:
func addFilerEffectAndVolumeToIndividualVideoClip(_ assetURL: URL, video: VideoFileModel, completion : ((_ session: AVAssetExportSession?, _ outputURL : URL?) -> ())?){
let videoFilteredAsset = AVAsset(url: assetURL)
print(videoFilteredAsset)
createVideoComposition(myAsset: videoFilteredAsset, videos: video)
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, videoFilteredAsset.duration), of: videoFilteredAsset.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 = videoFilteredAsset.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.videoClipVolume, at: kCMTimeZero)
//Add setting
audioMixParam.append(videoParam)
//Add audio on final record
do {
try compositionAudioVideo.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoFilteredAsset.duration), of: assetVideoTrack, at: kCMTimeZero)
} catch _ {
assertionFailure()
}
//Fading volume out for background music
let durationInSeconds = CMTimeGetSeconds(videoFilteredAsset.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.videoClipVolume, timeRange: firstSecond)
videoParam.setVolumeRamp(fromStartVolume: video.videoClipVolume, toEndVolume: 0, timeRange: lastSecond)
//Add parameter
audioMix.inputParameters = audioMixParam
// Export part, left for facility
let exporter = AVAssetExportSession(asset: videoFilteredAsset, presetName: AVAssetExportPresetHighestQuality)!
exporter.videoComposition = videoFilterComposition
exporter.outputURL = url
exporter.outputFileType = AVFileTypeQuickTimeMovie
exporter.audioMix = audioMix
exporter.exportAsynchronously(completionHandler: { () -> Void in
completion!(exporter, url)
})
}
在那之后,我再次使用一种方法使用 AVAssetExportSession
合并所有 Video Clips
,我没有设置任何 AudioMixInputParameters
。
注意:
当我使用 AVAssetExportSession 的
AudioMixInputParameters
在最终合并方法中设置音量时,Volume
是获取完整 Video
的零钱。
我的问题:是否可以为每个 Video Clips
设置多个 volume
。请建议。谢谢!
最佳答案
这是我的问题的有效解决方案:
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)
})
}
关于ios - 使用 AudioMixInputParameters AVFoundation 为每个视频轨道设置多个音量在 Swift iOS 中不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54804888/