AVMutableComposition删除视频音轨

问题描述：

我一直在尝试使用AVMutableComposition将音频（录制）与视频（.mp4）混合，这意味着我需要2个文件在混合后并行播放，这里是代码i使用： temporaryRecFile正在录制的文件URL路径 audiosURL是视频文件的URL路径AVMutableComposition删除视频音轨

NSURL *audiosURL =[[NSURL alloc] initFileURLWithPath:[[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:@"dam3.mp4"] ofType:nil]]; 

     NSLog(@"SOMEDATA IS THERE "); 
     AVURLAsset* audioAsset = [[AVURLAsset alloc]initWithURL:temporaryRecFile options:nil]; 
     AVURLAsset* audio2Asset = [[AVURLAsset alloc]initWithURL:audiosURL options:nil]; 

     AVMutableComposition* mixComposition = [AVMutableComposition composition]; 

    AVMutableCompositionTrack *compositionCommentary2Track = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; 
    [compositionCommentary2Track insertTimeRange:CMTimeRangeMake(kCMTimeZero, audio2Asset.duration) ofTrack:[[audio2Asset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:kCMTimeZero error:nil]; 

     NSLog(@"audio =%@",audioAsset); 
     AVMutableCompositionTrack *compositionCommentaryTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid]; 
     [compositionCommentaryTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, audioAsset.duration) ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:kCMTimeZero error:nil]; 


     AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetPassthrough]; 

     NSString* videoName = @"export.mov"; 

     NSString *exportPath = [NSTemporaryDirectory() stringByAppendingPathComponent:videoName]; 
     NSURL *exportUrl = [NSURL fileURLWithPath:exportPath]; 

     if ([[NSFileManager defaultManager] fileExistsAtPath:exportPath]) 
     { 
      [[NSFileManager defaultManager] removeItemAtPath:exportPath error:nil]; 
     } 

    _assetExport.outputFileType = AVFileTypeQuickTimeMovie; 
    //@"com.apple.quicktime-movie"; 
     NSLog(@"file type %@",_assetExport.outputFileType); 
     _assetExport.outputURL = exportUrl; 
     _assetExport.shouldOptimizeForNetworkUse = YES; 



     [_assetExport exportAsynchronouslyWithCompletionHandler: 
     ^(void) 
     { 
      switch (_assetExport.status) 
      { 
       case AVAssetExportSessionStatusCompleted: 
        // export complete 

        NSLog(@"Export Complete"); 
        // From Here I want play movie using MPMoviePlayerController.<<<--------- 
        NSString *fileNamePath = @"sound_record.mov"; 
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES); 
        NSString *documentsDirectory = [paths objectAtIndex:0]; 
        NSString *oldappSettingsPath = [documentsDirectory stringByAppendingPathComponent:fileNamePath]; 


        if ([[NSFileManager defaultManager] fileExistsAtPath:oldappSettingsPath]) { 

         NSFileManager *fileManager = [NSFileManager defaultManager]; 
         [fileManager removeItemAtPath: oldappSettingsPath error:NULL]; 

        } 
        NSURL *documentDirectoryURL = [NSURL fileURLWithPath:oldappSettingsPath]; 
        [[NSFileManager defaultManager] copyItemAtURL:exportUrl toURL:documentDirectoryURL error:nil]; 
        [audioAsset release]; 
        [audio2Asset release]; 
        [_assetExport release]; 
        [self performSelectorOnMainThread:@selector(playVideo:) withObject:documentDirectoryURL waitUntilDone:NO]; 

        break; 
       case AVAssetExportSessionStatusFailed: 
        NSLog(@"Export Failed"); 
        NSLog(@"ExportSessionError: %@", [_assetExport.error localizedDescription]); 

        //    export error (see exportSession.error) 
        break; 
       case AVAssetExportSessionStatusCancelled: 
        NSLog(@"Export Failed"); 
        NSLog(@"ExportSessionError: %@", [_assetExport.error localizedDescription]); 

        //    export cancelled 
        break; 

      } 
     } 
     ];

其结果是，导出的视频播放录制的音频与视频成功，但视频中的音轨是已删除，因此导出的.mov正在播放带有视频图像的录制音频文件而没有其声音，为什么会发生这种情况？

答

您必须将视频中的音频作为单独的音轨添加。所以你将有一个视频轨道和两个音轨。在您的代码中，您没有添加视频中的音频。

AVMutableComposition删除视频音轨

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