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• Compiling x264 for iOS 7

  25 janvier 2016, par user500

  I’m getting error on compiling x264 for iOS.

  I have Xcode Version 5.0 (5A1413) with Apple LLVM version 5.0 (clang-500.2.75) (based on LLVM 3.3svn). I’m compiling x264-snapshot-20130925-2245.

  Config :

  CC=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang ./configure \
  
  --host=arm-apple-darwin \
  
  --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk \
  
  --prefix=armv7 \
  
  --extra-cflags='-arch armv7' \
  
  --extra-ldflags="-L/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/lib/system -arch armv7" \
  
  --enable-pic \
  
  --enable-static

  Getting error :

  common/arm/cpu-a.S:29:7: error: unknown token in expression
  
  .align
  
        ^
  
  common/arm/cpu-a.S:139:5: error: instruction 'suble' can not set flags, but 's' suffix specified
  
      subles ip, ip, #1
  
      ^

• Converting mp4 to webm , ogg formats

  24 août 2016, par user2943893

  Currently i need to convert mp4 video to webm and ogg . To convert mp4 to webm i have used "ffmpeg.exe". I am running following code to convert video mp4 to webm.

  [DllImport("User32.dll")]
  
  public static extern bool SetForegroundWindow(IntPtr hWnd);
  
  public void mciConvertWavMP3(string fileName, bool waitFlag)
  
  {
  
  
  
      string savepath = Server.MapPath(fileName);
  
      string destpath = Server.MapPath(fileName);
  
      string pworkingDir = Server.MapPath("~/ffmpeg/");
  
  
  
   // string outfile = "-b:a 16 --resample 24 -m j " + savepath + " " + savepath.Replace(".wav", ".mp3") + ""; //--- lame code
  
    //  string outfile = "-b 192k -i " + savepath + " " + destpath.Replace(".mp4", ".webm");
  
     // string outfile = "ffmpeg -i " + savepath + " -acodec libvorbis -ac 2 -ab 96k -ar 44100 -b 345k -s 640x360 " + Server.MapPath("output-file.webm");
  
  
  
      string outfile = "ffmpeg -i \"test7.mp4\" -c:v libvpx -crf 10 -b:v 1M -c:a libvorbis \"" + Server.MapPath("output-file.webm") + "\"";
  
     // string outfile = "ffmpeg -i \""+fileName+"\" -codec:v libvpx -quality good -cpu-used 0 -b:v 600k -qmin 10 -qmax 42 -maxrate 500k -bufsize 1000k -threads 2 -vf scale=-1:480 -an -pass 1 -f webm /dev/null";
  
  
  
      System.Diagnostics.ProcessStartInfo psi = new System.Diagnostics.ProcessStartInfo();
  
      psi.FileName = pworkingDir+"ffmpeg.exe";
  
      psi.Arguments = outfile;
  
      psi.UseShellExecute = true;
  
      psi.CreateNoWindow = false;
  
      System.Diagnostics.Process p = System.Diagnostics.Process.Start(psi);
  
      Thread.Sleep(1000);// utput.webm
  
      if (waitFlag)
  
      {
  
          p.WaitForExit();
  
          // wait for exit of called application 
  
      }
  
  }

  I kept my project folder in D :/ drive

  When i am running from Command promt its working fine. But when i am running this code its not working fine.

  Formal errors which i am getting are :

  " unable to find a suitable output format for ’ffmpeg’ " kind of errors. SO please can any one help to solve this issue.

  Thank & Regards

• Reliably get PTS values in ffmpeg ?

  21 novembre 2013, par karl_

  I'm trying to write a method that will provide the next frame and presentation time stamp when queried. The code currently looks something like this :

  while( getNextFrame(image, pts) )
  
  {
  
      // show current image
  
      drawImage(currentImage);
  
      sleep(pts);
  
      currentImage = image;
  
  }

  I've been following the Dranger tutorials to this point, but have stalled on reliably getting a PTS value for frames (http://www.dranger.com/ffmpeg/tutorial05.html). The PTS values returned are always 0.

  Also, get_buffer() has been deprecated, so I'm now using the get_buffer2() method to set the global pts value. However, the release_buffer method has also been deprecated and I can't seem to find it's replacement. This leads me to believe that the method laid out in the tutorials may no longer be the best way of accomplishing this task.

  In short, using up to date ffmpeg, what's the best way to grab frame pts values reliably ?