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• avformat/utils : Fix confusing return value for ff_read_packet()

  12 mars 2021, par Andreas Rheinhardt

  avformat/utils : Fix confusing return value for ff_read_packet()
  Currently, ff_read_packet() sometimes forwards the return value of
  
  AVInputFormat.read_packet() (which should be zero on success, but isn't
  
  for all demuxers) and sometimes it overwrites this with zero.
  
  Furthermore, it uses two variables, one for the read_packet return value
  
  and one for other errors, which is a bit confusing ; it is also
  
  unnecessary given that the documentation explicitly states that
  
  ff_read_packet() never returns positive values. Returning a positive
  
  value would lead to leaks with some callers (namely asfrtp_parse_packet
  
  and estimate_timings_from_pts). So always return zero in case of
  
  success.
  (This behaviour stems from a time before av_read_packet sanitized
  
  the return value of read_packet at all : It was added in commit
  
  626004690c23c981f67228ea325dde3f35193988 and was unnecessary since
  
  88b00723906f68b7563214c30333e48888dddf78.)
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/utils.c

• NReco.VideoConverter GetVideoThumbnail memory leak

  18 février 2016, par Julien

  I am using the following code to process videos and grab a screenshot from them using http://www.nrecosite.com/video_converter_net.aspx.

  It leaks memory.

  Add a few hundred videos and you can see memory increase.

  Am I doing something wrong ? Or is this a bug with FFMpeg ?

  I have tried using a static instance of FFMpegConverter but it doesn’t seem to make a difference.

        public byte[] GetImage(string path)
  
        {
  
              using (var outputJpegStream = new MemoryStream())
  
              {
  
                  var nreco = new FFMpegConverter();
  
  
  
                  nreco.GetVideoThumbnail(path, outputJpegStream, 10);
  
  
  
                  outputJpegStream.Seek(0, SeekOrigin.Begin);
  
  
  
                  var thumbnailBytes = new byte[outputJpegStream.Length];
  
                  outputJpegStream.Read(thumbnailBytes, 0, Convert.ToInt32(outputJpegStream.Length));
  
  
  
                  using (var myMemStream = new MemoryStream(thumbnailBytes))
  
                  {
  
                      using (var fullsizeImage = Image.FromStream(myMemStream))
  
                      {
  
                          using (var newImage = fullsizeImage.GetThumbnailImage(480, 320, null, IntPtr.Zero))
  
                          {
  
                              using (var myResult = new MemoryStream())
  
                              {
  
                                  newImage.Save(myResult, ImageFormat.Png); 
  
                                  return myResult.ToArray();
  
                              }
  
                          }
  
                      }
  
                  }
  
              }
  
        }

• libxvid : Make codec use the init-cleanup flag and mark it as init-thread-safe

  7 avril 2015, par Vittorio Giovara

  libxvid : Make codec use the init-cleanup flag and mark it as init-thread-safe
  This takes care of memory leaks on init error.
  

  • [DBH] libavcodec/libxvid.c