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

  20 juin 2018, 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

• 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

• ffMpeg crashes on conversion from Powershell

  2 mars 2018, par Ahhhhhhhhhhhhhdfgbv

  I’m trying to create a Powershell that will loop through all the audio on a selected folder and add a jpg to the audio, outputting it as a video file.

  This is what I have so far :

  function mbAudioConvert {
  
      [Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms") | Out-Null
  
      [System.Windows.Forms.Application]::EnableVisualStyles()
  
      $browse = New-Object System.Windows.Forms.FolderBrowserDialog
  
      $browse.SelectedPath = "B:\testaudio"
  
      $browse.ShowNewFolderButton = $false
  
      $browse.Description = "Select the folder with the audio"
  
  
  
      $loop = $true
  
      while( $loop ) {
  
          if( $browse.ShowDialog() -eq "OK" ) {
  
              $loop = $false
  
              $folder = $browse.SelectedPath
  
              $counter = 0001
  
              $image = (Get-Item -Path ".\lib\AudioOnly.jpg")
  
              $ffmpeg = (Get-Item -Path ".\lib\ffmpeg.exe")
  
  
  
              Foreach( $item in (ls $folder\* -Include *.mp3, *.MP3, *.wav, *.WAV, *.ogg, *.OGG) ) {
  
                  $ffstring = " -loop 1 -i $image -i $item -shortest -c:v dnxhd -b:v 120M -s 1920x1080 -pix_fmt yuv422p -r 25 -c:a pcm_s16le -ar 48000 $item.mov"
  
  
  
                  echo "$counter. $item"
  
                  Start-Process -FilePath $ffmpeg -ArgumentList $ffstring -Wait -PassThru;
  
                  $counter++
  
              }
  
          } else {
  
              return
  
          }
  
      }
  
  
  
      $browse.SelectedPath
  
      $browse.Dispose()
  
  }
  
  mbAudioConvert

  Which works, only after each convert, ffMpeg crashes. I’m not sure if its the FFmpeg.exe or the Powershell itself that is the issue - but I have been going crazy trying to debug this.