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• Transcode video using celery and ffmpeg in django

  28 octobre 2015, par Robin

  I would like to transcode user uploaded videos using celery. I think first I should upload the video, and spawn a celery task for transcoding.

  Maybe something like this in the tasks.py :

  subprocess.call('ffmpeg -i path/.../original path/.../output')

  Just completed First steps with celery, so confused how to do so in the views.py and tasks.py. Also is it a good solution ? I would really appreciate your help and advice. Thank you.

  models.py :

  class Video(models.Model):
  
      user = models.ForeignKey(User)
  
      title = models.CharField(max_length=100)
  
      original = models.FileField(upload_to=get_upload_file_name)
  
      mp4_480 = models.FileField(upload_to=get_upload_file_name, blank=True, null=True)
  
      mp4_720 = models.FileField(upload_to=get_upload_file_name, blank=True, null=True)
  
      privacy = models.CharField(max_length=1,choices=PRIVACY, default='F')
  
      pub_date = models.DateTimeField(auto_now_add=True, auto_now=False)

  my incomplete views.py :

  @login_required
  
  def upload_video(request):
  
      if request.method == 'POST':
  
          form = VideoForm(request.POST, request.FILES)
  
          if form.is_valid():
  
              if form.cleaned_data:
  
                  user = request.user
  
                  #
  
                  #
  
                  # No IDEA WHAT TO DO NEXT
  
                  #
  
                  #
  
                  return HttpResponseRedirect('/')
  
  
  
      else:
  
          form = VideoForm()
  
          return render(request, 'upload_video.html', {
  
              'form':form
  
              })

• Merge individual frame to video file using Opencv

  18 août 2022, par Rohit

  I am trying to stack a individual frame to a video file using Opencv. I want to combine two different code together to make the individual frame.
Following code help me extract the individual frame,

  


  fourcc = cv2.VideoWriter_fourcc(*'mp4v')
out = cv2.VideoWriter('file_data.mp4',fourcc,20 (1920,1080),False)
while True:
    ret, frame=cap.read()
    mask = object_detector.apply(frame)
    _, mask  = cv2.threshold(mask,254,255,cv2.THRESH_BINARY)       
    contours,_ = cv2.findContours(mask, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
    res = cv2.bitwise_and(frame,frame,mask=mask)
    for cnt in contours:
        area = cv2.contourArea(cnt)
        if area>1000:   
            #print("Area of contour:", area)
            cv2.drawContours(frame, [cnt], -1, (0,255,0),2)
            cv2.imwrite("file%d.jpg"%count, frame)
            out.write(frame)
    if cv2.waitKey(1) and 0xFF == ord('q'):
        break


  


  I tried storing the individual frame in array, but it didn't work. It doesn't show any error, but pc crash.

  


  


  fps = 20,
,width = 1920
,height = 1080

  


  


• ogg : Provide an option to offset the serial number

  30 janvier 2015, par Luca Barbato

  ogg : Provide an option to offset the serial number
  The ogg serial number doubles as codec id and sequence
  
  value for concatenated samples.
  

  • [DBH] doc/muxers.texi
  • [DBH] libavformat/oggenc.c