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• ac3dec : Allow asymmetric application of DRC when drc_scale > 1

  13 janvier 2014, par John Stebbins

  ac3dec : Allow asymmetric application of DRC when drc_scale > 1
  Amplification of quiet sounds is enhanced.
  
  Inspired by gbooker’s A52Decoder.
  

  • [DH] libavcodec/ac3dec.c

• Render SharpDX Texture2D in UWP application

  10 décembre 2019, par Alex

  I’m implementing a solution for hardware-accelerated H264 decoding and rendering in the UWP application. I want to avoid copying from GPU to CPU.
  The solutions consists of 2 parts :

  1. C library that decodes the H264 stream using ffmpeg
  2. UWP/C#/SharpDX application to receive encoded data, pinvoke library and then render decoded frames.

  I receive encoded data in the C# application and send it to the C library to decode and get the pointer to the frame back using pinvoke.

  C part looks good so far. I managed to receive pointer to the decoded frame in GPU in the C library :

  // ffmpeg decoding logic
  
  ID3D11Texture2D* texturePointer = (ID3D11Texture2D*)context->frame->data[0];

  I managed to receive this pointer in C# code and create SharpDX texture from it.

  var texturePointer = decoder.Decode(...data...); // pinvoke
  
  if (texturePointer != IntPtr.Zero)
  
  {
  
      var texture = new Texture2D(texturePointer); // works just perfect
  
  }

  Now I need to render it on the screen. My understanding is that I can create class that extends SurfaceImageSource so I can assign it as a Source of XAML Image object.
  It can be something like this :

  public class RemoteMediaImageSource : SurfaceImageSource
  
  {
  
      public void BeginDraw(IntPtr texturePointer)
  
      {
  
          var texture = new Texture2D(texturePointer);
  
          // What to do to render texture in GPU to the screen?
  
      }
  
  }

  Is my assumption correct ?
  If yes, how do I exactly do the rendering part (code example would be highly appreciated) ?

• How to display progress bar while ffmpeg commad executing in android using android studio

  23 juillet 2017, par Hemanth Kumar

  Im having a problem to display progress bar with progress percentage like kb/s or 1-100% ,while ffmpeg command is executing .
  Here im doing video trimming using ffmpeg command
  I want to display a progressbar to the user when the process is going on
  But i can’t able to do this.
  Im developeing code in androidstudio
  Please tell mehow to extract process infortation of ffmpeg command and display using progressbar .
  Any one have solution for this please share .
  Thanks in advance.