Recherche avancée

Sur d’autres sites (13901)

• ffmpeg video to image sequence batch file

  26 mai 2014, par Dale Cooper

  I’m using ffmpeg to convert .avi file into a .png image sequence. This one works just fine :

  @ ECHO OFF
  
  
  
  FOR %%A IN (*.avi) DO CALL :avi2png "%%A"
  
  
  
  :avi2png
  
  ffmpeg.exe -y -i %* -sameq -f image2 -c:v png "%%03d.png"
  
  
  
  ECHO.
  
  GOTO :EOF

  ---

  But I want the script to extract the name without the extension from .avi file that is currently being processed. This is what the image sequence should look like : currentavi001.png, currentavi002.png etc. The script I came up with isn’t working :

  @ ECHO OFF
  
  
  
  FOR %%A IN (*.avi) DO CALL :avi2png "%%A"
  
  
  
  :avi2png
  
  ffmpeg.exe -y -i %* -sameq -f image2 -c:v png "%%~nA%%03d.png"
  
  
  
  ECHO.
  
  GOTO :EOF

  ---

  I’ve tried both %~nA and %%~nA, but to no avail. The script returns this :

  Couldn't open file : 
  
  av_interleaved_write_frame(): Input/output error.

  I’m a complete layman and would welcome every bit of help.

• Faster way to write image to Process.StandardInput.BaseStream

  4 septembre 2012, par Hasibii

  Im trying to send a lot of desktop captured images to an encoders (FFmpeg) stdin.

  The following code example works.

  the CaptureScreen() function provides an image in 5-10 ms.

  If I save the image in a MemoryStream it takes almost no time.

  But I can only save 1 image every 45 ms to
  proc.StandardInput.BaseStream.

  public void Start(string bitrate, string buffer, string fps, string rtmp, string resolution, string preset)
  
  {
  
      proc.StartInfo.FileName = myPath + "\\ffmpeg.exe";
  
      proc.StartInfo.Arguments = "-f image2pipe -i pipe:.bmp -vcodec libx264 -preset " + preset + " -maxrate " + bitrate + "k -bufsize " +
  
      buffer + "k -bt 10 -r " + fps + " -an -y test.avi"; //+ rtmp;
  
      proc.StartInfo.UseShellExecute = false;
  
      proc.StartInfo.RedirectStandardInput = true;
  
      proc.StartInfo.RedirectStandardOutput = true;
  
  
  
      proc.Start();
  
  
  
      Stopwatch st = new Stopwatch();
  
      BinaryWriter writer = new BinaryWriter(proc.StandardInput.BaseStream);
  
      System.Drawing.Image img;
  
  
  
      st.Reset();
  
      st.Start();
  
  
  
      for (int z = 0; z < 100; z++)
  
      {
  
          img = ScrCap.CaptureScreen();
  
          img.Save(writer.BaseStream, System.Drawing.Imaging.ImageFormat.Bmp);
  
          img.Dispose();
  
      }
  
  
  
      st.Stop();
  
      System.Windows.Forms.MessageBox.Show(st.ElapsedMilliseconds.ToString());
  
  }

  The question is :

  Can I do the saving process faster ?

  I try to get stable 60 fps this way

• Revision eb6aee50a4 : Code cleanup. Change-Id : I7c6e3bebd94856b24dbe2aded7f9e04ef8bb8c08

  20 février 2013, par Dmitry Kovalev

  Changed Paths : Modify /vp9/common/vp9_blockd.h Modify /vp9/common/vp9_idct.h Modify /vp9/common/vp9_invtrans.h Code cleanup. Change-Id : I7c6e3bebd94856b24dbe2aded7f9e04ef8bb8c08