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• Inaccurate sleep using C++11 on Windows

  15 février 2017, par Ashe the human

  I’ve been using C++11 sleep to give the interval between video frames. This method I’ve been using makes playback elongated on Windows.

  #include <iostream>
  
  #include <thread>
  
  #include <sstream>
  
  
  
  
  
  int main(const int argc, const char **args)
  
  {
  
      std::stringstream sb;
  
  
  
      if(argc &lt; 2)
  
          return 1;
  
      int fps = 0;
  
      sb &lt;&lt; args[1];
  
      sb >> fps;
  
  
  
      if(fps &lt;= 0)
  
          return 1;
  
      int i;
  
  
  
  
  
      while(true)
  
      {
  
          std::chrono::high_resolution_clock::time_point start, end;
  
  
  
          start = std::chrono::high_resolution_clock::now();
  
          for(i=0; i fps));
  
          }
  
          end = std::chrono::high_resolution_clock::now();
  
  
  
          auto c = std::chrono::duration_cast(end - start).count();
  
          std::cerr &lt;&lt; c &lt;&lt; std::endl;
  
      }
  
  
  
      return 0;
  
  }
  
  </sstream></thread></iostream>

  Running that program with 60 gives about 1004 1006 on Linux and 1065 1075 on Windows. So, I’m guessing, after playing a 2-hour long video, more than a minute is passed than just 2 hours.

  timeBeginPeriod() has no effect. Is using timer(like this one ?) is the only way to implement media players on Windows ? What about on Linux ? I think it’s the right way considering the fact that ffplay uses av_usleep().

  So sad that there’s no portable way.

• x264 & ARM on Windows Phone

  16 octobre 2013, par ssk

  I am trying to build x264 (http://www.videolan.org/developers/x264.html)

  I used this project to build it on Windows using Visual Studio : http://winx264.codeplex.com/documentation

  I found these steps to build it on Windows using MSYS : http://www.ayobamiadewole.com/Blog/How-to-build-x264-or-libx264.dll-in-Windows and http://software.intel.com/en-us/articles/building-x264-with-intel-compiler-for-windows

  I found that ARM support has been added to x264 recently. x264 depends on Intel compiler and YASM assembler. I am not sure whether this is supported on Windows Phone 8.

  1) Has anyone built a windows phone 8 project using Intel compiler ? Is it supported ?

  2) I am not familiar with assemblers. Is YASM assembler supported on Windows Phone 8 ?

• Add watermark text on mkv video using ffmpeg windows version [on hold]

  27 mars 2015, par sajjad hosseini

  I want to add a watermark text to a mkv video using ffmpeg windows version .
  I want the watermark to be like a subtitle that starts on minute 2 and lasts for 30 seconds and says : copyright to mysite.com . I tried mkvmerge to add a subtitle but it can be easily deleted by others , so now i’m relying on ffmpeg to do this for me . Can anyone help me with the process ? I want the watermark to be actually on the video and can’t be deleted using mkvmerge .