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• http: Stop reading after receiving the whole file for non-chunked transfers

  11 août 2014, par Martin Storsjö

  http: Stop reading after receiving the whole file for non-chunked transfers
  Previously this logic was only used if the server didn’t
  
  respond with Connection : close, but use it even for that case,
  
  if the server response is non-chunked.
  Originally the http code has relied on Connection : close to close
  
  the socket when the file/stream is received - the http protocol
  
  code just kept reading from the socket until the socket was closed.
  
  In f240ed18 we added a check for the file size, because some
  
  http servers didn’t respond with Connection : close (and wouldn’t
  
  close the socket) even though we requested it, which meant that the
  
  http protocol blocked for a long time at the end of files, waiting
  
  for a socket level timeout.
  When reading over tls, trying to read at the end of the connection,
  
  when the peer has closed the connection, can produce spurious (but
  
  harmless) warnings. Therefore always voluntarily stop reading when
  
  the specified file size has been received, if not using a chunked
  
  transfer encoding. (For chunked transfers, we already return 0
  
  as soon as we get the chunk header indicating end of stream.)
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/http.c

• libopenjpegenc : fix out-of-bounds reads when filling the edges

  13 octobre 2016, par Andreas Cadhalpun

  libopenjpegenc : fix out-of-bounds reads when filling the edges
  The calculation of width/height should round up, not round down to
  
  prevent setting width or height to 0.
  Also image->comps[compno].w is unsigned (at least in openjpeg2), so the
  
  calculation could silently wrap around without the explicit cast to int.
  Reviewed-by : Michael Bradshaw <mjbshaw@gmail.com>
  
  Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
  
  Signed-off-by : Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
  

  • [DH] libavcodec/libopenjpegenc.c

• 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