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• avcodec/x86/videodsp : Small speedups in ff_emulated_edge_mc x86 SIMD.

  26 octobre 2013, par Ronald S. Bultje

  avcodec/x86/videodsp : Small speedups in ff_emulated_edge_mc x86 SIMD.
  Don’t use word-size multiplications if size == 2, and if we’re using
  
  SIMD instructions (size >= 8), complete leftover 4byte sets using movd,
  
  not mov. Both of these changes lead to minor speedups.
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/x86/videodsp.asm

• DirectShow IVideoWindow can't be wider than 4096px

  25 mars 2019, par ulvesked

  I have a C# application which uses DirectShow to show play video clips. We recently tried to play a video that is 9600x1080 px and it would not show. DirectShow emits events that everything.

  We use K-Lite codec pack (1295) and utilise ffdshow libx264 as codec and video renderer. Media Player Classic using the same renderer can play the clip just fine. The latest version of our application use DirectShow.NET while the older versions call DirectShow interfaces directly. Both old and new versions of our application have the same issues.

  After some experimentation we have found out the following :

  • If the video window width is 4096px or narrower it will render video. If it is 4097 or wider it will not render any video. We tried playing a HD-clip and a 720-clip with the same results. They will play when the video window is 4096x1080 but not when the window is 4097x1080 or wider.

  • When changing resolution or graphic settings there are some flashes (a few frames) of the video when the settings is applied, so that would suggest that it is in fact playing the video but it displays only black.

  Tested on Windows 10, 64 bit.

  Any ideas of what the we can do to fix this ?

• How to encode Live Streaming using NReco.VideoConverter ?

  11 janvier 2016, par Siva Prasanna

  I’m developing an application to encode a live stream using NReco.VideoConverter component. I’m getting a live video stream from one of my IP cameras, and it uses rtsp. The url is "rtsp ://test.vaprtech.com/vid/show.sav ?[PARAMETERS]". Now the code I use is given below.

  private void button1_Click(object sender, EventArgs e)
  
  {
  
          String path="rtsp://test.vaprtech.com/vid/show.sav?[PARAMETERS]";
  
          String pathToSave="C:\\Videos\\LiveVideo.mp4";
  
          var ffMpeg = new NReco.VideoConverter.FFMpegConverter();
  
          ConvertLiveMediaTask task=ffMpeg.ConvertLiveMedia(path, Format.mp4, pathToSave, Format.mp4, new ConvertSettings(){VideoCodec="h264"});
  
          task.Start();
  
  }

  But I’m getting an error saying

  "The best overloaded method match for
  ’...ConvertLiveMedia(string,string,System.IO.Stream,string,ConvertSettings)’
  has some invalid arguments".