如何音频和视频使用AVMutableCompositionTrack合并(How to merge

在我的应用程序需要合并的音频和视频，然后我需要在媒体播放器来播放音频文件。我该如何合并在IOS的音频和视频。是否有任何的源代码这一点。请建议我的一些想法

提前致谢

Answer 1:

用这个

AVURLAsset* audioAsset = [[AVURLAsset alloc]initWithURL:audioUrl options:nil];
AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:videoUrl options:nil];

AVMutableComposition* mixComposition = [AVMutableComposition composition];

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

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

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

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 = @"com.apple.quicktime-movie";
_assetExport.outputURL = exportUrl;
_assetExport.shouldOptimizeForNetworkUse = YES;

[_assetExport exportAsynchronouslyWithCompletionHandler:
 ^(void ) {      
            // your completion code here
     }       
 }
 ];

Answer 2:

您可以通过创建易变的成分合并视频。

AVMutableComposition* composition = [[AVMutableComposition alloc]init];
AVURLAsset* video1 = [[AVURLAsset alloc]initWithURL:[NSURL fileURLWithPath:path1]options:nil];

NSArray *pathComponents = [NSArray arrayWithObjects:
[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject],@"MyAudio.m4a",nil];

  NSURL *outputFileURL = [NSURL fileURLWithPathComponents:pathComponents];
AVAsset *audioAsset = [AVAsset assetWithURL:outputFileURL];

//Create mutable composition of audio type
 AVMutableCompositionTrack *audioTrack = [composition    addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];

[audioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero,video1.duration)
ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:kCMTimeZero error:nil];

  AVMutableCompositionTrack* composedTrack = [composition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];

[composedTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, video1.duration)
ofTrack:[[video1 tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]
atTime:kCMTimeZero error:nil];


AVAssetExportSession*exporter = [[AVAssetExportSession alloc]initWithAsset:composition presetName:AVAssetExportPresetHighestQuality];

[exporter exportAsynchronouslyWithCompletionHandler:^{
           case AVAssetExportSessionStatusFailed:
                 NSLog(@"Failed to export video");
                 break;
           case AVAssetExportSessionStatusCancelled:
                 NSLog(@"export cancelled");
                 break;

}

对于视频合并访问本教程。 http://iosbucket.blogspot.in/2015/04/mp4-conversion-and-video-merging-in-ios.html

您还可以找到用于合并视频示例项目。