合并 Video & 时出现问题音频 iOS swift4 [英] Issue while merging Video & Audio iOS swift4

问题描述

2019-04-10 10:49:51.590008+0500 VTKaraokeView[869:1039603] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArray0 objectAtIndex:]: index 0 beyond bounds for empty NSArray'

iOS 大师您好！我正在合并 Video &音频文件(.mp4 & .mp3 文件)...

Hi iOS Gurus! I'm merging Video & Audio files(.mp4 & .mp3 file)...

背景&问题陈述:-

因为我正在开发像卡拉 OK 这样的应用程序......我正在录制带有背景音乐的视频，然后在合并此录制的视频后背景音乐到新的 newVideo.mp4 文件，然后播放 .newVideo.mp4 到 AVPlayerViewController ......因为这很完美，但问题是当我录制的视频超过了近 10 秒，然后我收到了上述异常.并且此异常发生在这一行 let aAudioOfVideoTrack : AVAssetTrack = aVideoAsset.tracks(withMediaType: AVMediaTypeAudio)[0]

As I'm working on an App like karaoke... I'm recording Video with Background Music and then AFTER MERGING this recorded video & background music into new newVideo.mp4 file and then Playing .newVideo.mp4 into AVPlayerViewController... As this works perfect BUT the problem is when my recorded video exceeds from almost 10 seconds then I'm getting this above exception. AND this exception occurs on this Line let aAudioOfVideoTrack : AVAssetTrack = aVideoAsset.tracks(withMediaType: AVMediaTypeAudio)[0]

func mergeFilesWithUrl(videoUrl: URL, audioUrl:URL)
{
    let savePathUrl : NSURL = NSURL(fileURLWithPath: NSHomeDirectory() + "/Documents/newVideo.mp4")

    do { // delete old video
        try FileManager.default.removeItem(at: savePathUrl as URL)
    } catch { print(error.localizedDescription) }


    let mixComposition : AVMutableComposition = AVMutableComposition()
    var mutableCompositionVideoTrack : [AVMutableCompositionTrack] = []
    var mutableCompositionAudioTrack : [AVMutableCompositionTrack] = []
    var mutableCompositionAudioOfVideoTrack : [AVMutableCompositionTrack] = []
    let totalVideoCompositionInstruction : AVMutableVideoCompositionInstruction = AVMutableVideoCompositionInstruction()

    //start merge
    let aVideoAsset : AVAsset = AVAsset(url: videoUrl)
    let aAudioAsset : AVAsset = AVAsset(url: audioUrl)

    mutableCompositionVideoTrack.append(mixComposition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid))
    mutableCompositionAudioTrack.append(mixComposition.addMutableTrack(withMediaType: AVMediaTypeAudio, preferredTrackID: kCMPersistentTrackID_Invalid))
    mutableCompositionAudioOfVideoTrack.append( mixComposition.addMutableTrack(withMediaType: AVMediaTypeAudio, preferredTrackID: kCMPersistentTrackID_Invalid))

    let aAudioOfVideoTrack : AVAssetTrack = aVideoAsset.tracks(withMediaType: AVMediaTypeAudio)[0] // HERE i'm getting Error...Index Array Out Of Bound... 
    let aVideoAssetTrack : AVAssetTrack = aVideoAsset.tracks(withMediaType: AVMediaTypeVideo)[0]
    let aAudioAssetTrack : AVAssetTrack = aAudioAsset.tracks(withMediaType: AVMediaTypeAudio)[0]

    do{
        try mutableCompositionAudioOfVideoTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, aVideoAssetTrack.timeRange.duration), of: aAudioOfVideoTrack , at: kCMTimeZero)
        try mutableCompositionVideoTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, aVideoAssetTrack.timeRange.duration), of: aVideoAssetTrack, at: 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), of: aAudioAssetTrack, at: kCMTimeZero)

        //Use this instead above line if your audiofile and video file's playing durations are same

        //            try mutableCompositionAudioTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, aVideoAssetTrack.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 = CGSize(width: 1280, height: 720)//CGSize(1280,720)




    finalPath = savePathUrl.absoluteString

    let assetExport: AVAssetExportSession = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)!
    assetExport.outputFileType = AVFileTypeMPEG4
    assetExport.outputURL = savePathUrl as URL
    assetExport.shouldOptimizeForNetworkUse = true

    assetExport.exportAsynchronously { () -> Void in
        switch assetExport.status {

        case AVAssetExportSessionStatus.completed:
            print("success")
        case  AVAssetExportSessionStatus.failed:
            print("failed \(assetExport.error)")
        case AVAssetExportSessionStatus.cancelled:
            print("cancelled \(assetExport.error)")
        default:
            print("complete")
        }
    }


}

推荐答案

花了将近1天时间解决这个&这是解决此问题的完美解决方案...

Spent almost 1 day to solve this & This is the perfect solution for this...

经过 iOS 的帮助8 iPad AVCaptureMovieFileOutput 在录制 13 - 14 秒后丢失/丢失/永远不会获得音轨 ...

只需添加这一行 &就像一个魅力

Just add this line & works like a charm

avCaptureMovieFileOutput.movieFragmentInterval = kCMTimeInvalid

这篇关于合并 Video & 时出现问题音频 iOS swift4的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！