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• Pass ID3D11Texture2D back buffer to libx264 encoder

  17 janvier 2019, par Chris Sixsmith

  I’m writing a C++ program to encode frames from a DirectX game to the H.264/MPEG-4 AVC format. I am using libx264 alone with no other dependencies at the moment.

  I have a ID3D11Texture2D* resolved back buffer of the next game frame. I need to somehow copy this into the x264_picture input (apparently YUV420P format according to limited help I’ve found) but I cannot find any way to do so online.

  Here is my code at the moment :

  void Fx264VideoEncoder::Fx264VideoEncoderImpl::InitFrameInputBuffer(const FTexture2DRHIRef& BackBuffer, FFrame& Frame)
  
  {
  
      x264_picture_alloc(Frame.InputPicture, X264_CSP_I420, x264Parameters.i_width, x264Parameters.i_height);
  
  
  
      // We need to take the back buffer and convert it to an input format that libx264 can understand
  
      {
  
          ID3D11Texture2D* ResolvedBackBufferDX11 = (ID3D11Texture2D*)(GetD3D11TextureFromRHITexture(Frame.ResolvedBackBuffer)->GetResource());
  
          EPixelFormat PixelFormat = Frame.ResolvedBackBuffer->GetFormat();
  
  
  
          // ...?
  
      }
  
  }

• Use ffmpeg to compile RGBA image sequence into two separate videos (RGB + Alpha)

  27 novembre 2018, par MirceaKitsune

  I plan on using Blender to render animated sequences for a game. I need the videos to have transparent backgrounds in the format expected by its engine. This format involves the transparency being defined as a separate grayscale video of equal FPS and duration. Since splitting the RGB and Alpha channels in Blender is more complicated, I’d prefer doing this directly from ffmpeg.

  The input directory contains an image sequence of png files in RGBA format (eg : 0000.png to 0100.png). What I need ffmpeg to do is compile them into two separate videos : One containing only the RGB channels (leave transparency black) and another containing only the grayscale alpha channel. In the end I’d have something like my_video.mp4 + my_video_mask.mp4.

  I’m familiar with compiling non-transparent image sequences into video using :

  ffmpeg -f image2 -i /path/to/sequence/%04d.png output.mp4

  But I don’t know how to extract the alpha channel and make it a separate video file. What is the simplest ffmpeg command to achieve this result ?

• moviepy problem with audio export : AttributeError : 'FFMPEG_AudioWriter' object has no attribute 'proc'

  3 novembre 2018, par Jaivin Wylde

  In this example, I need to create an audio export for speech recognition.

  clips = moviepy.editor.concatenate_videoclips(videoPart, method="compose")
  
  
  
  clips.audio.write_audiofile("Clips/", game.replace(" ", "_") +
  
                              "/audio_export.mp3", verbose=False, codec="libmp3lame")

  Then I get this error message.

  Traceback (most recent call last):
  
  File "/usr/local/lib/python3.5/dist-packages/moviepy/audio/io/ffmpeg_audiowriter.py", line 134, in __del__
  
  self.close()
  
  File "/usr/local/lib/python3.5/dist-packages/moviepy/audio/io/ffmpeg_audiowriter.py", line 122, in close
  
  if self.proc:
  
  AttributeError: 'FFMPEG_AudioWriter' object has no attribute 'proc'

  I would appreciate any help, thank you.