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• Adding subtitles with FFMpegCore in C# is not working on Azure Function

  1er février 2024, par Skerdi Berberi

  I have deployed a C# azure function with ffmpeg.exe (using FFMpegCore nuget). The function adds audio and srt/ass subtitles to a video.
When I test locally this code works (running on azurite). But, when I deploy the azure function, the audio is added to the video but the subtitles don't show up.

  


  At the begining I thought it was an issue with the Fonts because I was using ASS File for subtitles but then I switched to SRT and still is not working.

  


  I've tried with both SRT and ASS but they both don't work using this code :

  


  await FFMpegArguments
 .FromFileInput(videoInputPath, true, options =>
 {
     options.WithCustomArgument("-stream_loop -1");
 })
 .AddFileInput(audioPath, true)
 .OutputToFile(videoOutputPath, true, (options) =>
 {
     options.WithDuration(thread.AudioData.TotalAudioDuration);

     options.WithVideoCodec(VideoCodec.LibX264);   // Re-encode video using x264 codec
     options.WithAudioCodec(AudioCodec.Aac);       // Re-encode audio to AAC
     options.WithSpeedPreset(Speed.VeryFast);
     options.UsingShortest(true);

     options.WithVideoFilters((videoOptions) =>
     {
         videoOptions.HardBurnSubtitle(SubtitleHardBurnOptions.Create(subtitlesFile));
     });
 }).ProcessAsynchronously();


  


  Here's the command it creates on Azure function :

  


  ffmpeg -stream_loop -1 -i "C:\local\Temp\videoTempPath.mp4" -i "C:\local\Temp\audioTempPath.mp3" -t 00:00:22.8160000 -c:v libx264 -c:a aac -preset veryfast -shortest -vf "subtitles='C\:\\local\\Temp\\subtitles.srt'" "C:\local\Temp\output.mp4" -y


  


• Transcodeit Add metadata to audio files

  22 avril 2016, par Gismmo

  I have found how to encode audio tracks to multiple formats, I am just struggling to try and find a way to attach specific metadata to the tracks when they are encoded. I would like to add, album artwork, artists name, track name, and genre etc.

  I can see in the audio encoding parameters there are additional FFmpeg parameters you can set, however i am unsure what to use in order to set the metadata ?

  {
  
    "steps": {
  
    "imported": {
  
    "robot": "/s3/import",
  
    "result": true,
  
    "key": "AWS_KEY",
  
    "secret": "AWS_SECRET",
  
    "bucket": "BUCKET",
  
    "path": "CUSTOM-PATH"
  
  },
  
  "mp3": {
  
    "use": "imported",
  
    "robot": "/audio/encode",
  
    "result": true,
  
    "preset": "mp3",
  
    "ffmpeg": [],
  
    "ffmpeg_stack": "v2.2.3"
  
  },
  
  "wav": {
  
    "use": "imported",
  
    "robot": "/audio/encode",
  
    "result": true,
  
    "preset": "wav",
  
    "ffmpeg_stack": "v2.2.3"
  
  },
  
  "export": {
  
    "robot": "/s3/store",
  
    "use": [
  
      "mp3",
  
      "wav"
  
    ],
  
    "key": "AWS_KEY",
  
    "secret": "AWS_SECRET",
  
    "bucket": "BUCKET"
  
  }

• org.bytedeco.javacv.CanvasFrame showImage is hanging

  24 août 2018, par user3911119

  An IOS device is uploading h264 files (3 sec videos) to a server. Each file is successfully readable by VLC.

  Using FFMpegFrameGrabber, I grab each frame and try to display them using CanvasFrame.showImage as below. However, the method call hangs.

  CanvasFrame canvas = new CanvasFrame("ios");
  
  canvas.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  
  canvas.setAlwaysOnTop(true);
  
  canvas.setResizable(true);
  
  try(FileInputStream fis = new FileInputStream(file))
  
  {
  
      try(FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(fis))
  
      {
  
          grabber.setFormat("h264");
  
          grabber.start();
  
          while(true)
  
          {
  
              Frame frame = grabber.grabImage();
  
              if(frame != null)
  
              {
  
                  canvas.showImage(frame);
  
              }
  
          }
  
      }
  
  }

  Am I doing anything wrong in the above code ?

  EDIT#1 : When I try to save the buffered image for the frame, a valid image is saved.

  BufferedImage image = converter.getBufferedImage(frame);
  
  File outputfile = new File("png_file");
  
  ImageIO.write(image, "png", outputfile);