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 [英] Setting multiple Volumes to each Video tracks using AudioMixInputParameters AVFoundation is not working in Swift iOS
问题描述
我正在使用Swift
中基于Application
的Application
.根据要求,我必须从Device Gallery
中选择多个Videos
,为每个Video Asset
设置不同的CIFilter
效果和Volume
,然后合并所有Videos
并保存Final Video
.作为输出,当我播放Final Video
时,Video
声音volume
应该相应地改变.
I am working on Video
based Application
in Swift
. As per the requirement I have to select multiple Videos
from Device Gallery
, setting up different different CIFilter
effects and Volume
for each Video Asset
and then merge all the Videos
and have to Save the Final Video
. As an output, when I will play the Final Video
then Video
sound volume
should change accordingly.
我已经将所有选定的Video Assets
合并为具有不同的CIFilter
效果的一个,但是我的问题是,当我尝试为每个Video Clips
设置Volume
时,它不起作用.我正在为Final Video
获取默认的Volume
.这是我的代码:
I have already merged all the selected Video Assets
into one with different different CIFilter
effects but my problem is when I am trying to set Volume
for each Video Clips
then it's not working. I am getting the default Volume
for my Final Video
. Here is my code:
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)
})
}
此后,我再次使用一种方法来使用AVAssetExportSession
合并所有Video Clips
,在那里我没有设置任何AudioMixInputParameters
.
After that again I am using a method to merge all the Video Clips
using AVAssetExportSession
, there I am not setting any AudioMixInputParameters
.
Note:
当我使用AVAssetExportSession's
AudioMixInputParameters
在最终合并方法中设置音量时,Volume
会更改为完整的Video
.
Note:
When I am setting up volume in final merging method using AVAssetExportSession's
AudioMixInputParameters
, then Volume
is getting change for full Video
.
我的问题:是否可以为每个Video Clips
设置多个volume
.请提出建议.谢谢!
My question: Is it possible to set multiple volume
for each Video Clips
. Please suggest. Thank you!
推荐答案
这是我的问题的有效解决方案:
Here is the working solution for my question:
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)
})
}
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