• EGC

    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 read more

Internal error.

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