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• how can I get the length of an video in order to validate django form before upload can begin ?

  10 juillet 2013, par GetItDone

  I have an app running on heroku that allows users to upload videos, then I use ffmpeg to preform 3 tasks using celery and redis-to-go :

  1) Check the format and if it isn't already mp4, convert it to mp4.
  
  2) Extract a 3 minute clip, in mp4 format
  
  3) Grab an image from the video

  The problem is that I want to verify the video length before the video is uploaded and the three tasks are run since I want to make sure all videos are at least 15 minutes, and if not I want to raise a ValidationError. So when validating the form, I want to do something like this :

  def clean(self, *args, **kwargs):        
  
      data = super(ContentTypeRestrictedVideoField, self).clean(*args, **kwargs)
  
  
  
      file = data.file
  
      try:
  
          content_type = file.content_type
  
          main, extension = content_type.split('/')
  
          if content_type in self.content_types:
  
              if file._size > self.max_upload_size:
  
                  raise forms.ValidationError(_('Please keep filesize under %s. Current filesize %s') % (filesizeformat(self.max_upload_size), filesizeformat(file._size)))
  
              if VIDEO_LENGTH < MINIMUM_LENGTH:
  
                  raise forms.ValidationError(_('Please make sure video file is at least %s. Current video length %s') % (MINIMUM_LENGTH, VIDEO_LENGTH)
  
          else:
  
              raise forms.ValidationError(_('File type is not supported. File must be mov, flv, avi, mpeg, wmv, or mp4.'))
  
      except AttributeError:
  
          pass        
  
  
  
      return data

  What could I do for VIDEO_LENGTH and MINIMUM_LENGTH ? I read that ffprobe could be used for getting the duration, but it isn't available with the buildpack I am using and I am very inexperienced. I can't just validate file size because it can vary greatly depending on numerous factors. Anyone have any solution as to what I could try ? Thanks

• mov : Add an option to toggle dref opening

  15 janvier 2016, par Derek Buitenhuis

  mov : Add an option to toggle dref opening
  This feature is mostly only used by NLE software, and is
  
  both of dubious value being enabled by default, and a
  
  possible security risk.
  Signed-off-by : Derek Buitenhuis <derek.buitenhuis@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/isom.h
  • [DH] libavformat/mov.c
  • [DH] libavformat/version.h

• avdevice/decklink : 10 Bit support for Decklink input device

  18 janvier 2015, par Georg Lippitsch

  avdevice/decklink : 10 Bit support for Decklink input device
  Example to capture video clip at 1080i50 10 bit :
  
  ffmpeg -bm_v210 1 -f decklink -i ’UltraStudio Mini Recorder@11’ -acodec copy -vcodec copy output.avi
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavdevice/decklink_common_c.h
  • [DH] libavdevice/decklink_dec.cpp
  • [DH] libavdevice/decklink_dec_c.c