Swift：合并音频和视频文件

Posted 2023-02-25

【中文标题】Swift：合并音频和视频文件

【英文标题】：Swift: Merge audio and video files

【发布时间】：2014-12-27 03:33:52

【问题描述】：

我想将视频与音频文件合并，但我无法做到。视频被导出，但音频文件不想被合并:)

func mergeAudio(audioURL: NSURL, moviePathUrl: NSURL, savePathUrl: NSURL) 
    var composition = AVMutableComposition()
    let trackVideo:AVMutableCompositionTrack = composition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: CMPersistentTrackID())
    let trackAudio:AVMutableCompositionTrack = composition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: CMPersistentTrackID())
    let option = NSDictionary(object: true, forKey: "AVURLAssetPreferPreciseDurationAndTimingKey")
    let sourceAsset = AVURLAsset(URL: moviePathUrl, options: option)
    let audioAsset = AVURLAsset(URL: audioURL, options: option)

    println(sourceAsset)
    println("playable: \(sourceAsset.playable)")
    println("exportable: \(sourceAsset.exportable)")
    println("readable: \(sourceAsset.readable)")

    let tracks = sourceAsset.tracksWithMediaType(AVMediaTypeVideo)
    let audios = audioAsset.tracksWithMediaType(AVMediaTypeAudio)

    if tracks.count > 0 
        let assetTrack:AVAssetTrack = tracks[0] as AVAssetTrack
        let assetTrackAudio:AVAssetTrack = audios[0] as AVAssetTrack

        let audioDuration:CMTime = assetTrackAudio.timeRange.duration
        let audioSeconds:Float64 = CMTimeGetSeconds(assetTrackAudio.timeRange.duration)
        println(audioSeconds)

        trackVideo.insertTimeRange(CMTimeRangeMake(kCMTimeZero,audioDuration), ofTrack: assetTrack, atTime: kCMTimeZero, error: nil)
        trackAudio.insertTimeRange(CMTimeRangeMake(kCMTimeZero,audioDuration), ofTrack: assetTrackAudio, atTime: kCMTimeZero, error: nil)
    

    var assetExport: AVAssetExportSession = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetPassthrough)
    assetExport.outputFileType = AVFileTypeMPEG4
    assetExport.outputURL = savePathUrl
    self.tmpMovieURL = savePathUrl
    assetExport.shouldOptimizeForNetworkUse = true
    assetExport.exportAsynchronouslyWithCompletionHandler(
        self.performSegueWithIdentifier("previewSegue", sender: self)
    )

问题出在哪里？我错过了什么？

【问题讨论】：

有没有想过这个？

你有想过这个吗？

【参考方案1】：

我一直在寻找代码来将音频和视频文件合并到一个视频中，但找不到任何地方，所以在阅读苹果文档后花了几个小时我编写了这段代码。

注意：这是为我测试过的 100% 工作代码。

步骤：1 在您的 viewController 中导入这些模块。

import UIKit
import AVFoundation
import AVKit
import AssetsLibrary

第 2 步： 在你的代码中添加这个函数

func mergeFilesWithUrl(videoUrl:NSURL, audioUrl:NSURL)

    let mixComposition : AVMutableComposition = AVMutableComposition()
    var mutableCompositionVideoTrack : [AVMutableCompositionTrack] = []
    var mutableCompositionAudioTrack : [AVMutableCompositionTrack] = []
    let totalVideoCompositionInstruction : AVMutableVideoCompositionInstruction = AVMutableVideoCompositionInstruction()
    
    
    //start merge
    
    let aVideoAsset : AVAsset = AVAsset(URL: videoUrl)
    let aAudioAsset : AVAsset = AVAsset(URL: audioUrl)
    
    mutableCompositionVideoTrack.append(mixComposition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid))
    mutableCompositionAudioTrack.append( mixComposition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: kCMPersistentTrackID_Invalid))
    
    let aVideoAssetTrack : AVAssetTrack = aVideoAsset.tracksWithMediaType(AVMediaTypeVideo)[0]
    let aAudioAssetTrack : AVAssetTrack = aAudioAsset.tracksWithMediaType(AVMediaTypeAudio)[0]
    
    
    
    do
        try mutableCompositionVideoTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, aVideoAssetTrack.timeRange.duration), ofTrack: aVideoAssetTrack, atTime: kCMTimeZero)
        
        //In my case my audio file is longer then video file so i took videoAsset duration
        //instead of audioAsset duration
        
        try mutableCompositionAudioTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, aVideoAssetTrack.timeRange.duration), ofTrack: aAudioAssetTrack, atTime: kCMTimeZero)
        
        //Use this instead above line if your audiofile and video file's playing durations are same
        
        //            try mutableCompositionAudioTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, aAudioAssetTrack.timeRange.duration), ofTrack: aAudioAssetTrack, atTime: kCMTimeZero)
        
    catch
        
    
    
    totalVideoCompositionInstruction.timeRange = CMTimeRangeMake(kCMTimeZero,aVideoAssetTrack.timeRange.duration )
    
    let mutableVideoComposition : AVMutableVideoComposition = AVMutableVideoComposition()
    mutableVideoComposition.frameDuration = CMTimeMake(1, 30)
    
    mutableVideoComposition.renderSize = CGSizeMake(1280,720)
    
    //        playerItem = AVPlayerItem(asset: mixComposition)
    //        player = AVPlayer(playerItem: playerItem!)
    //
    //
    //        AVPlayerVC.player = player
    
    
    
    //find your video on this URl
    let savePathUrl : NSURL = NSURL(fileURLWithPath: NSHomeDirectory() + "/Documents/newVideo.mp4")
    
    let assetExport: AVAssetExportSession = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)!
    assetExport.outputFileType = AVFileTypeMPEG4
    assetExport.outputURL = savePathUrl
    assetExport.shouldOptimizeForNetworkUse = true
    
    assetExport.exportAsynchronouslyWithCompletionHandler  () -> Void in
        switch assetExport.status 
            
        case AVAssetExportSessionStatus.Completed:
            
            //Uncomment this if u want to store your video in asset
            
            //let assetsLib = ALAssetsLibrary()
            //assetsLib.writeVideoAtPathToSavedPhotosAlbum(savePathUrl, completionBlock: nil)
            
            print("success")
        case  AVAssetExportSessionStatus.Failed:
            print("failed \(assetExport.error)")
        case AVAssetExportSessionStatus.Cancelled:
            print("cancelled \(assetExport.error)")
        default:
            print("complete")
        
    
    
    

第 3 步： 像这样在你想要的地方调用函数

let videoUrl : NSURL =  NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("SampleVideo", ofType: "mp4")!)
let audioUrl : NSURL = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("SampleAudio", ofType: "mp3")!)
        
mergeFilesWithUrl(videoUrl, audioUrl: audioUrl)

希望这会对您有所帮助并节省您的时间。

【讨论】：

@Govind 如果录音机的声音是 AVFileTypeAppleM4A 格式，则它不起作用，有什么建议吗？

@DumitruRogojinaru，对不起兄弟，我不知道这种格式。

@GovindPrajapati 嘿，干得好，但此代码删除了原始视频的声音。我怎样才能保留它？

我找到了方法，请查看***.com/questions/45313680/…

@Faruk 我的视频是空白的，有音频。知道为什么吗？

【参考方案2】：

为了让它工作，我写了这段代码。

assetExport.exportAsynchronouslyWithCompletionHandler  () -> Void in
    switch assetExport.status 
    case AVAssetExportSessionStatus.Completed:
        let assetsLib = ALAssetsLibrary()
        assetsLib.writeVideoAtPathToSavedPhotosAlbum(savePathUrl, completionBlock: nil)
    case  AVAssetExportSessionStatus.Failed:
        println("failed \(assetExport.error)")
    case AVAssetExportSessionStatus.Cancelled:
        println("cancelled \(assetExport.error)")
    default:
        println("complete")
    

另外，请注意不能用相同的文件名覆盖。