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• Save generated image to ImageField model Django

  7 janvier 2023, par MrLonely

  


  Detected path traversal attempt in '/home/mrlonely/Desktop/lumen/lumen/media/thumbnail/6.jpeg'

  


  


  When i run this in the views.py :

  


  def generate_thumbnail(instance):
   post = Post.objects.get(pk=instance.pk)
   output = 'media/thumbnail/' + post.title + '.jpeg'
   filename_thumbnail = Path.joinpath(filename, output)  
   try:
      (
            ffmpeg
            .input(str(filename)+post.video.url, ss='00:00:20')
            .output(output, vframes=1)
            .overwrite_output()
            .run(capture_stdout=True, capture_stderr=True)
        )
      with open(filename_thumbnail, 'rb') as file_handler:
         django_file = File(file_handler)
         post.thumbnail.save(filename_thumbnail, 'thumbnail/')
   except ffmpeg.Error as e:
        print(e.stderr.decode(), file=sys.stderr)
        sys.exit(1)


  


  I am trying to connect the ffmpeg generated thumbnail to the model ImageField on the Post model (instance is post)

  


• Inputting Audio Stream to FFMPEG

  5 avril 2018, par Wijaya

  I’m building a real time chat application with C# and ffmpeg.exe. My requirement is to get a memory stream from Microsoft Speech API and feed it to ffmpeg process in real time. I can take a memory stream from Microsoft Speech API. I’m using following code to create the memory stream.

          using (MemoryStream stream = new MemoryStream())
  
          {
  
              MemoryStream streamAudio = new MemoryStream();
  
              System.Media.SoundPlayer m_SoundPlayer = new System.Media.SoundPlayer();
  
              _speechSynthesizerVisemesSender.SetOutputToWaveStream(streamAudio);
  
              _speechSynthesizerVisemesSender.SetOutputToNull();
  
              stream.WriteTo(proc.StandardInput.BaseStream);
  
          }   

  I’m already using another datapipe with another command to feed video content to ffmpeg. But I couldn’t find a stable solution to feed audio through a datapipe. This article briefly explains about audio datapipe. I’m using following command to stream audio.

  "ffmpeg -re -f s16le -i pipe:wav -f mpegts udp://127.0.0.1:1234"

  But it is not working with the datapipe. If I try the command with mp3 or wav file, it works.

• aacenc : remove support for AAC LTP profile

  8 février, par Lynne

  aacenc : remove support for AAC LTP profile
  The LTP profile of AAC is... terrible.
  
  It was an early 90's attempt at bridging the gap between speech
  
  codecs and general purpose codecs. It did so by trying to exploit the fact
  
  that most speech patterns are regular.
  Unfortunately, it went about it the same way as AAC Main, by taking
  
  the previous frame's samples, modifying them through an LPC filter,
  
  transforming them back using a forward MDCT, putting the output
  
  coefficients back into the current frame, and using delta coding.
  
  But once again, they ignored basic mathematics and MDCT leakage.
  
  Thankfully, because AAC LTP is meant to operate at very low bitrates,
  
  the extreme quantization results in most leakage being irrelevant.
  Unfortunately, the result is that the output sounds pretty much
  
  terrible regardless of whether LTP is enabled or not.
  This was the first attempt at trying to couple speech coding into AAC.
  
  No, the second attempt did not succeed either.
  
  Nnnneither did the third. Or fourth.
  For the fifth one, they literally just jammed a speech codec into AAC
  
  with USAC once they saw Opus do it.
  Just drop support for encoding AAC LTP. It was always experimental
  
  to begin with.
  

  • [DH] libavcodec/Makefile
  • [DH] libavcodec/aaccoder.c
  • [DH] libavcodec/aacenc.c
  • [DH] libavcodec/aacenc.h
  • [DH] libavcodec/aacenc_ltp.c
  • [DH] libavcodec/aacenc_ltp.h
  • [DH] libavcodec/aacenctab.h