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• DirectShow Encryption and Decryption Filters incorrect path leading to wrong decoding ?

  11 mai 2016, par Michael Chi Lam

  Situation : I’m creating two DirectShow Filters cryptography. I’ve written them as In place transformations however it’s not working as planned, I believe it has something to do my encoding and decoding paths. My source is an AVI and my output a encrypted MP4. (Encryption Filter) for my decryption filter I take in a mp4 and render the video. However when I attempt to render the video, the play back is a black screen.

  AVI to MP4 on GraphStudioNext :
  

  MP4 to Video Renderer :
  

  Both of them works, however when I insert my Cryptography(This is the encryption, I got lazy and didn’t rename it properly) and Decryption filter respectively it doesn’t work

  I placed my Encrypt and Decrypt side by side (See below) and it generates an mp4 that I can play back.
  

  Question : Is there a filter I am missing on the decoding path ? (Mp4 to Render)

• Encoded Video's path gets changed in database after encoding with ffmpeg and celery and works as normal without celery

  16 novembre 2020, par Danny

  I have this code to transcode video and it works well without celery. With celery, the path of the file in the database shows a different path and the video cannot be played in the browser, but it saves the file in the correct location in the pc.

  


  If I don't use celery, then the file path in database is media/videos/videos/<filename>.mp4</filename> and file also gets saved here. This way the template is able to play the video. But if I use celery, the output gets saved in media/videos/videos/<filename>.mp4</filename> but the path in database will be media/<filename>.mp4</filename> somehow and thus template can't play the video.

  


  Is it because my page gets updated before the task ? and not getting saved properly ?

  


  views.py

  


  def post(self, *args, **kwargs):
    form = VideoPostForm(self.request.POST or None, self.request.FILES or None)
    if form.is_valid():
        video = form.save(commit=False)
        video.user = self.request.user
        video.save()
        form.save_m2m()
        # task_video_encoding(video.id)
        task_video_encoding.delay(video.id)
        return redirect('videos:my_video_home')
    else:
        raise ValidationError('Check all form fields.')


  


  encoding.py

  


  def encode_video(video_id):
    video = VideoPost.objects.get(id = video_id)
    input_file_path = video.temp_file.path
    # print(input_file_path)
    input_file_name = video.title
    #get the filename (without extension)
    filename = os.path.basename(input_file_path)
    # print(filename)
    # path to the new file, change it according to where you want to put it
    output_file_name = os.path.join('{}.mp4'.format(filename))
    # print(output_file_name)
    # output_file_path = os.path.join(settings.MEDIA_ROOT, output_file_name)
    output_file_path = os.path.join(settings.MEDIA_ROOT, 'videos', 'videos', output_file_name)
    # print(output_file_path)

    for i in range(1):
        subprocess.call([settings.VIDEO_ENCODING_FFMPEG_PATH, '-i', input_file_path, '-codec:v', 'libx264', '-crf', '-preset',
                    '-b:v', '3000k', '-maxrate', '-bufsize', '6000k', '-vf', 'scale=-2:720',
                    '-codec:a', 'aac', '128k', '-strict', '-2', output_file_path])
    # Save the new file in the database
    video.file = output_file_name
    video.save(update_fields=['file'])
    print(video.file)
    video.temp_file.delete()


  


  models

  


  class VideoPost(models.Model):
    user                = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, blank=True, null=True)
    title               = models.TextField(max_length=1000)
    temp_file           = models.FileField(upload_to='videos/temp_videos/', validators=[validate_file_extension], null=True)
    file                = models.FileField(upload_to='videos/videos/', validators=[validate_file_extension], blank=True, max_length=255)
    post_date           = models.DateTimeField(auto_now_add=True, verbose_name="Date Posted")
    updated             = models.DateTimeField(auto_now_add=True, verbose_name="Date Updated")
    slug                = models.SlugField(blank=True, unique=True, max_length=255)


  


  Can anyone help me how to change this code in a way to show the converted video properly in the template.

  


• mpegaudioenc : Remove broken integer-only quantization code path

  9 novembre 2013, par Diego Biurrun

  mpegaudioenc : Remove broken integer-only quantization code path
  

  • [DBH] libavcodec/mpegaudioenc.c
  • [DBH] libavcodec/mpegaudiotab.h