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    This is the community forum for my apps Pythonista and Editorial.

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    EGC

    @EGC

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    Latest posts made by EGC

    • Merging downloaded Audio and Video

      I'm looking a way to merge the video and audio files downloaded with youtube-dl (All using Pythonista, obviously.)

      Has anyone done this?
      I found some objective-c code in StackOverflow for example:

      https://stackoverflow.com/questions/14618362/how-to-merge-audio-in-our-video-file
      https://stackoverflow.com/questions/13909400/merging-audio-with-video-objective-c

      I picked the second but haven't gone too far.

      ns_video_path = nsurl(video_path)
      ns_audio_path = nsurl(audio_path)
      ns_out_video_path = nsurl(out_video_path)
      
      AVMutableComposition = ObjCClass('AVMutableComposition')
      mixComposition = AVMutableComposition.composition()
      nextClipStartTime = CMTime.in_dll(c,'kCMTimeZero')
      
      videoAsset= ObjCClass('AVURLAsset').alloc().initWithURL_options_(ns_video_path,None)
      
      # How to call a objective-c  function? is there a bridge for them?  
      # I reviewed objc_util http://omz-software.com/pythonista/docs/ios/objc_util.html
      #
      # CMTimeRange video_timeRange = CMTimeRangeMake(kCMTimeZero,videoAsset.duration);
      #
      
      

      Here's one sample from StackOverflow

      -(void)mergeAudioVideo
      {
      
         NSString *videoOutputPath=[_documentsDirectory stringByAppendingPathComponent:@"dummy_video.mp4"];
         NSString *outputFilePath = [_documentsDirectory stringByAppendingPathComponent:@"final_video.mp4"];
         if ([[NSFileManager defaultManager]fileExistsAtPath:outputFilePath])
             [[NSFileManager defaultManager]removeItemAtPath:outputFilePath error:nil];
      
      
         NSURL    *outputFileUrl = [NSURL fileURLWithPath:outputFilePath];
         NSString *filePath = [_documentsDirectory stringByAppendingPathComponent:@"newFile.m4a"];
      
         AVMutableComposition* mixComposition = [AVMutableComposition composition];
         NSURL    *audio_inputFileUrl = [NSURL fileURLWithPath:filePath];
         NSURL    *video_inputFileUrl = [NSURL fileURLWithPath:videoOutputPath];
      
         CMTime nextClipStartTime = kCMTimeZero;
      
         AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:video_inputFileUrl options:nil];
         CMTimeRange video_timeRange = CMTimeRangeMake(kCMTimeZero,videoAsset.duration);
      
         AVMutableCompositionTrack *a_compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
         [a_compositionVideoTrack insertTimeRange:video_timeRange ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:nextClipStartTime error:nil];
      
         AVURLAsset* audioAsset = [[AVURLAsset alloc]initWithURL:audio_inputFileUrl options:nil];
         CMTimeRange audio_timeRange = CMTimeRangeMake(kCMTimeZero, audioAsset.duration);
         AVMutableCompositionTrack *b_compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
         [b_compositionAudioTrack insertTimeRange:audio_timeRange ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:nextClipStartTime error:nil];
      
         AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetMediumQuality];
         _assetExport.outputFileType = @"com.apple.quicktime-movie";
         _assetExport.outputURL = outputFileUrl;
      
         [_assetExport exportAsynchronouslyWithCompletionHandler:
          ^(void ) {
              if (_assetExport.status == AVAssetExportSessionStatusCompleted) {
      
               //Write Code Here to Continue
              }
              else {
                 //Write Fail Code here
              }
          }
          ];
      
      }
      
      posted in Pythonista
      EGC
      EGC