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• ffmpeg error : "Missing ')' or too many args in 'if(gt(a,1),650,-1)'"

  23 février 2015, par Remini me

  I am trying to run this ffmpeg command in linux shell, to scale down the video (if portrait, than to maximum height of 650, while adjusting the width. And if landscape, then 650 maximum width, and adjust the height with aspect ratio) :

  ffmpeg -i 1.mp4 -r 30 -vf scale="'if(gt(a,1),650,-1)':'if(gt(a,1),-1,650)'" -vcodec libx264 output_file1.mp4

  But I get the following error :

  [scale @ 0x1d48a40] [Eval @ 0x7fff53a49340] Missing ’)’ or too many
  args in ’if(gt(a,1),650,-1)’ [scale @ 0x1d48a40] [Eval @
  0x7fff53a49340] Missing ’)’ or too many args in ’if(gt(a,1),-1,650)’
  Error when evaluating the expression ’if(gt(a,1),-1,650)’

  **EDIT : I have tried using the new @slhck syntax :

  -vf "scale=if(gt(a\,1)\,650\,-2):if(gt(a\,1)\,-2\,650)"

  The result I got was :

  ffmpeg version 0.8.16-4:0.8.16-0ubuntu0.12.04.1, Copyright (c)
  2000-2014 the Libav developers built on Sep 16 2014 18:33:49 with
  gcc 4.6.3 The ffmpeg program is only provided for script compatibility
  and will be removed in a future release. It has been deprecated in the
  Libav project to allow for incompatible command line syntax
  improvements in its replacement called avconv (see Changelog for
  details). Please use avconv instead.

  Seems stream 0 codec frame rate differs from container frame rate :
  180000.00 (180000/1) -> 90000.00 (180000/2) Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ’1.mp4’ : Metadata :
  major_brand : isom
  minor_version : 0
  compatible_brands : isom3gp4
  creation_time : 2015-02-05 14:54:24 Duration : 00:00:45.30, start : 0.000000, bitrate : 17058 kb/s
  Stream #0.0(eng) : Video : h264 (High), yuv420p, 1920x1080, 17021 kb/s, 30.01 fps, 90k tbr, 90k tbn, 180k tbc
  Metadata :
  creation_time : 2015-02-05 14:54:24
  Stream #0.1(eng) : Audio : aac, 48000 Hz, stereo, s16, 124 kb/s
  Metadata :
  creation_time : 2015-02-05 14:54:24 File ’output_file1.mp4’ already exists. Overwrite ? [y/N] y

  [buffer @ 0x747ec0] w:1920 h:1080 pixfmt:yuv420p [scale @ 0x745a40] [Eval @ 0x7fffac94b220] Missing ’)’ or too many args in
  ’if(gt(a,1),650,-2)’ [scale @ 0x745a40] [Eval @ 0x7fffac94b220]
  Missing ’)’ or too many args in ’if(gt(a,1),-2,650)’ Error when
  evaluating the expression ’if(gt(a,1),-2,650)’ Error opening
  filters !

  What should I do ?

• 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
  
              })

• Revision 1fc70e47cd : Adds code for corner detection and ransac This code is to start experiments wit

  7 février 2015, par Deb Mukherjee

  Changed Paths :
   Add /vp9/encoder/vp9_corner_detect.c

  
   Add /vp9/encoder/vp9_corner_detect.h

  
   Add /vp9/encoder/vp9_corner_match.c

  
   Add /vp9/encoder/vp9_corner_match.h

  
   Add /vp9/encoder/vp9_global_motion.c

  
   Add /vp9/encoder/vp9_global_motion.h

  
   Add /vp9/encoder/vp9_ransac.c

  
   Add /vp9/encoder/vp9_ransac.h

  
   Modify /vp9/vp9cx.mk

  
  
  Adds code for corner detection and ransac

  This code is to start experiments with global motion models.

  The corner detection can be either fast_9 or Harris.
  Corner matching is currently based on normalized correlation.
  Three flavors of ransac are used to estimate either a
  homography (8-param), or an affine model (6-param) or a
  rotation-zoom only affine model (4-param).

  The highest level API for the library is in vp9_global_motion.h,
  where there are two functions - one for computing a single model
  and another for computing multiple models up to a maximum number
  provided or until a desired inlier probability is achieved.

  Change-Id : I3f9788ec2dc0635cbc65f5c66c6ea8853cfcf2dd