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• avformat/rtmppkt : Convert ff_amf_tag_size() to bytestream2

  28 juillet 2017, par Michael Niedermayer

  avformat/rtmppkt : Convert ff_amf_tag_size() to bytestream2
  Fixes : out of array accesses
  
  Fixes : crash-9238fa9e8d4fde3beda1f279626f53812cb001cb-SEGV
  Found-by : JunDong Xie of Ant-financial Light-Year Security Lab
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/rtmppkt.c

• Picturebox from AForge FFMPEG empty - C#/WinForms

  1er août 2017, par Jake Delson

  I’ve done a ton of research and looked at a lot of questions here but can’t seem to find anything to help me. I should preface I’m very new to C#, Windows Forms, and SO ! I’m a 1st year CompSci student coming from C++ experimenting with my own projects for the summer. I’m trying to display a series of bitmaps from a .avi using the AForge.Video.FFMPEG video file reader.

  It seems to be finding the file, getting its’ data (console prints dimensions, framerate, and codec) and creating the picturebox, but the picturebox comes up blank/empty. I get the bitmap from the frames of a .avi :

  From AForge example code here

  Then I’m trying to display it with a picture box :

  From MS example code here as well

  And here’s my code. Essentially a combination of the two :

      public class Simple : Form
  
  {
  
      Bitmap videoFrame;
  
  
  
      public Simple()
  
      {
  
          try
  
          {
  
              // create instance of video reader
  
              VideoFileReader reader = new VideoFileReader();
  
              // open video file
  
              reader.Open(@"C:\Users\User\Desktop\ScanTest3.AVI");
  
              // check some of its attributes
  
              Console.WriteLine("width:  " + reader.Width);
  
              Console.WriteLine("height: " + reader.Height);
  
              Console.WriteLine("fps:    " + reader.FrameRate);
  
              Console.WriteLine("codec:  " + reader.CodecName);
  
  
  
              PictureBox pictureBox1 = new PictureBox();
  
  
  
              // read 100 video frames out of it
  
              for (int i = 0; i < 100; i++)
  
              {
  
                  videoFrame = reader.ReadVideoFrame();
  
  
  
                  pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
  
                  pictureBox1.ClientSize = new Size(videoFrame.Width, videoFrame.Height);
  
                  pictureBox1.Image = videoFrame;
  
  
  
                  // dispose the frame when it is no longer required
  
                  videoFrame.Dispose();
  
              }
  
  
  
              reader.Close();
  
          }
  
  
  
          catch
  
          {
  
              Console.WriteLine("Nope");
  
          }
  
  
  
      }
  
  }
  
  
  
  class MApplication
  
  {
  
      public static void Main()
  
      {
  
          Application.Run(new Simple());
  
      }
  
  }

  So that’s it pretty much. Just a blank picture box coming up, when it should have the first frame of the video, even though no exception caught (though I’m pretty confident I’m using the try/catch very poorly), and the console printing the correct data for the file :

  width:  720
  
  height: 480
  
  fps:    29
  
  codec:  dvvideo
  
  [swscaler @ 05E10060] Warning: data is not aligned! This can lead to a speedloss

  Though if anyone could tell me what that warning means, that would be great as well, but I’m mainly just lost as to why there’s no picture printing to the screen.

  Thanks !

• creating thumbnail image through ffmpeg.exe

  18 septembre 2017, par Aniruddha Das

  I am creating thumbnail image(small size) from a big image. for same images it unable to create the thumbnail. if i move the image from one place to another it works.

  case :

  if image x is created in year 2000 and i tried to extract thumbnail from that and let i failed. then i moved the same image to another place and again try to extracted the thumbanil and it successfully extracted the thumbnail. even if i am again transforming the same image to the same place it is working.

  Edit : The command is :

  C:/xampp/htdocs/jcert6/seyretfiles/tools/converter/ffmpeg.exe
  
     -i "\\myip\knowledge base\videos\user_62\RHSSNet_Image_Library\images\Touchport_II\CD302_14_TPII_17in_PPR_Scanner.jpg" 
  
     -y -f mjpeg -s 72x92 -vframes 1
  
     -an c:/xampp/htdocs/jcert6/seyretfiles/uploads/thumbnails/user_62/user_62_tz2jliomkfunsrhd1291976903_0.jpg –

  While debugging, I found that if any images do not have created date is not processed by the ffmpeg and generate error image codec parameter.

  is it possible to process images without having a create date in ffmpeg ???