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iOS视频添加背景音乐同时保留原音

转载 作者：qq735679552 更新时间：2022-09-27 22:32:09 25 4
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这篇CFSDN的博客文章iOS视频添加背景音乐同时保留原音由作者收集整理，如果你对这篇文章有兴趣，记得点赞哟.

话不多说，请看代码:

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//抽取原视频的音频与需要的音乐混合
-( void )addmusic:(id)sender
{
  [MBProgressHUDshowHUDAddedTo:self.viewanimated:YES];
 
  AVMutableComposition *composition =[AVMutableCompositioncomposition];
  audioMixParams =[[NSMutableArrayalloc]initWithObjects:nil];
 
  //录制的视频
  NSURL *video_inputFileUrl =[NSURLfileURLWithPath:self.videoPath];
  AVURLAsset *songAsset =[AVURLAssetURLAssetWithURL:video_inputFileUrloptions:nil];
  CMTime startTime =CMTimeMakeWithSeconds( 0 ,songAsset.duration.timescale);
  CMTime trackDuration =songAsset.duration;
 
  //获取视频中的音频素材
  [selfsetUpAndAddAudioAtPath:video_inputFileUrltoComposition:compositionstart:startTimedura:trackDurationoffset:CMTimeMake( 14 * 44100 , 44100 )];
 
  //本地要插入的音乐
  NSString *bundleDirectory =[[NSBundlemainBundle]bundlePath];
  NSString *path = [bundleDirectorystringByAppendingPathComponent:@ "30secs.mp3" ];
  NSURL *assetURL2 =[NSURLfileURLWithPath:path];
  //获取设置完的本地音乐素材
  [selfsetUpAndAddAudioAtPath:assetURL2toComposition:compositionstart:startTimedura:trackDurationoffset:CMTimeMake( 0 , 44100 )];
 
  //创建一个可变的音频混合
  AVMutableAudioMix *audioMix =[AVMutableAudioMixaudioMix];
  audioMix.inputParameters =[NSArrayarrayWithArray:audioMixParams]; //从数组里取出处理后的音频轨道参数
 
  //创建一个输出
  AVAssetExportSession *exporter =[[AVAssetExportSessionalloc]
         initWithAsset:composition
         presetName:AVAssetExportPresetAppleM4A];
  exporter.audioMix = audioMix;
  exporter.outputFileType=@ "com.apple.m4a-audio" ;
  NSString* fileName =[NSStringstringWithFormat:@ "%@.mov" ,@ "overMix" ];
  //输出路径
  NSString *exportFile =[NSStringstringWithFormat:@ "%@/%@" ,[selfgetLibarayPath], fileName];
 
  if ([[NSFileManagerdefaultManager]fileExistsAtPath:exportFile]) {
   [[NSFileManagerdefaultManager]removeItemAtPath:exportFileerror:nil];
  }
  NSLog(@ "是否在主线程1%d" ,[NSThreadisMainThread]);
  NSLog(@ "输出路径===%@" ,exportFile);
 
  NSURL *exportURL =[NSURLfileURLWithPath:exportFile];
  exporter.outputURL = exportURL;
  self.mixURL =exportURL;
 
  [exporterexportAsynchronouslyWithCompletionHandler:^{
   int exportStatus =( int )exporter.status;
   switch (exportStatus){
    caseAVAssetExportSessionStatusFailed:{
     NSError *exportError =exporter.error;
     NSLog(@ "错误，信息: %@" , exportError);
     [MBProgressHUDhideHUDForView:self.viewanimated:YES];
     break ;
    }
    caseAVAssetExportSessionStatusCompleted:{
     NSLog(@ "是否在主线程2%d" ,[NSThreadisMainThread]);
     NSLog(@ "成功" );
     //最终混合
     [selftheVideoWithMixMusic];
     break ;
    }
   }
  }];
}
 
//最终音频和视频混合
-( void )theVideoWithMixMusic
{
  NSError *error =nil;
  NSFileManager *fileMgr =[NSFileManagerdefaultManager];
  NSString *documentsDirectory =[NSHomeDirectory()
         stringByAppendingPathComponent:@ "Documents" ];
  NSString *videoOutputPath =[documentsDirectorystringByAppendingPathComponent:@ "test_output.mp4" ];
  if ([fileMgrremoveItemAtPath:videoOutputPatherror:&error]!=YES) {
   NSLog(@ "无法删除文件，错误信息：%@" ,[error localizedDescription]);
  }
 
  //声音来源路径（最终混合的音频）
  NSURL *audio_inputFileUrl =self.mixURL;
 
  //视频来源路径
  NSURL *video_inputFileUrl = [NSURLfileURLWithPath:self.videoPath];
 
  //最终合成输出路径
  NSString *outputFilePath =[documentsDirectorystringByAppendingPathComponent:@ "final_video.mp4" ];
  NSURL *outputFileUrl = [NSURLfileURLWithPath:outputFilePath];
 
  if ([[NSFileManagerdefaultManager]fileExistsAtPath:outputFilePath])
   [[NSFileManagerdefaultManager]removeItemAtPath:outputFilePatherror:nil];
 
  CMTime nextClipStartTime =kCMTimeZero;
 
  //创建可变的音频视频组合
  AVMutableComposition* mixComposition =[AVMutableCompositioncomposition];
 
  //视频采集
  AVURLAsset* videoAsset =[[AVURLAssetalloc]initWithURL:video_inputFileUrloptions:nil];
  CMTimeRange video_timeRange =CMTimeRangeMake(kCMTimeZero,videoAsset.duration);
  AVMutableCompositionTrack*a_compositionVideoTrack = [mixCompositionaddMutableTrackWithMediaType:AVMediaTypeVideopreferredTrackID:kCMPersistentTrackID_Invalid];
  [a_compositionVideoTrackinsertTimeRange:video_timeRangeofTrack:[[videoAssettracksWithMediaType:AVMediaTypeVideo]objectAtIndex: 0 ]atTime:nextClipStartTimeerror:nil];
 
  //声音采集
  AVURLAsset* audioAsset =[[AVURLAssetalloc]initWithURL:audio_inputFileUrloptions:nil];
  CMTimeRange audio_timeRange =CMTimeRangeMake(kCMTimeZero,videoAsset.duration); //声音长度截取范围==视频长度
  AVMutableCompositionTrack*b_compositionAudioTrack = [mixCompositionaddMutableTrackWithMediaType:AVMediaTypeAudiopreferredTrackID:kCMPersistentTrackID_Invalid];
  [b_compositionAudioTrackinsertTimeRange:audio_timeRangeofTrack:[[audioAssettracksWithMediaType:AVMediaTypeAudio]objectAtIndex: 0 ]atTime:nextClipStartTimeerror:nil];
 
  //创建一个输出
  AVAssetExportSession* _assetExport =[[AVAssetExportSessionalloc]initWithAsset:mixCompositionpresetName:AVAssetExportPresetMediumQuality];
  _assetExport.outputFileType =AVFileTypeQuickTimeMovie;
  _assetExport.outputURL =outputFileUrl;
  _assetExport.shouldOptimizeForNetworkUse=YES;
  self.theEndVideoURL=outputFileUrl;
 
  [_assetExportexportAsynchronouslyWithCompletionHandler:
  ^( void ) {
   [MBProgressHUDhideHUDForView:self.viewanimated:YES];
   //播放
   NSURL*url = [NSURLfileURLWithPath:outputFilePath];
   MPMoviePlayerViewController *theMovie =[[MPMoviePlayerViewControlleralloc]initWithContentURL:url];
   [selfpresentMoviePlayerViewControllerAnimated:theMovie];
   theMovie.moviePlayer.movieSourceType=MPMovieSourceTypeFile;
   [theMovie.moviePlayerplay];
  }
  ];
  NSLog(@ "完成！输出路径==%@" ,outputFilePath);
}
 
//通过文件路径建立和添加音频素材
- ( void )setUpAndAddAudioAtPath:(NSURL*)assetURLtoComposition:(AVMutableComposition*)composition start:(CMTime)startdura:(CMTime)duraoffset:(CMTime)offset{
 
  AVURLAsset *songAsset =[AVURLAssetURLAssetWithURL:assetURLoptions:nil];
 
  AVMutableCompositionTrack *track =[compositionaddMutableTrackWithMediaType:AVMediaTypeAudiopreferredTrackID:kCMPersistentTrackID_Invalid];
  AVAssetTrack *sourceAudioTrack =[[songAssettracksWithMediaType:AVMediaTypeAudio]objectAtIndex: 0 ];
 
  NSError *error =nil;
  BOOL ok =NO;
 
  CMTime startTime = start;
  CMTime trackDuration = dura;
  CMTimeRange tRange =CMTimeRangeMake(startTime,trackDuration);
 
  //设置音量
  //AVMutableAudioMixInputParameters（输入参数可变的音频混合）
  //audioMixInputParametersWithTrack（音频混音输入参数与轨道）
  AVMutableAudioMixInputParameters *trackMix =[AVMutableAudioMixInputParametersaudioMixInputParametersWithTrack:track];
  [trackMixsetVolume: 0 .8fatTime:startTime];
 
  //素材加入数组
  [audioMixParamsaddObject:trackMix];
 
  //Insert audio into track //offsetCMTimeMake(0, 44100)
  ok = [trackinsertTimeRange:tRangeofTrack:sourceAudioTrackatTime:kCMTimeInvaliderror:&error];
}
 
  #pragma mark - 保存路径
-(NSString*)getLibarayPath
{
  NSFileManager *fileManager =[NSFileManagerdefaultManager];
  NSArray* paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
  NSString* path = [pathsobjectAtIndex: 0 ];
  NSString *movDirectory = [pathstringByAppendingPathComponent:@ "tmpMovMix" ];
  [fileManagercreateDirectoryAtPath:movDirectorywithIntermediateDirectories:YESattributes:nilerror:nil];
  return movDirectory;
}

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原文链接：http://blog.csdn.net/ws1352864983/article/details/50806820 。

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