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• how to use multiple videos with background in it with color correction

  12 novembre 2022, par Muneer

  Hey i am try to create a batch input output file with that so i can easliy add my video in to a frame with top header and footer GIF for youtube subscribe and credit in the right side my logo and card should be display and the left the actual video should be shared to avoid video theifs please help me out

  


  look at my code but not working
for %%a in ("_input\*.*") do ffmpeg -loop 1 -i image.png -i "%%a"  -filter_complex "overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2:shortest=1; movie=111.mp4" -codec:a copy -movflags +faststart _output\%%~na.mp4

  


  look at the image what i acutaly want any kind of help would be much much appreciated thank you[]

  


• avcodec : add prores_metadata bsf for set the color property of each prores frame

  28 octobre 2018, par Martin Vignali

  avcodec : add prores_metadata bsf for set the color property of each prores frame
  

  • [DH] doc/bitstream_filters.texi
  • [DH] libavcodec/Makefile
  • [DH] libavcodec/bitstream_filters.c
  • [DH] libavcodec/prores_metadata_bsf.c

• a lot of GREEN Color at YUV420p —> RGB in OpenGL 2.0 Shader on iOS

  25 octobre 2012, par 이형근

  I want to make a movie player for iOS using ffmpeg and OpenGL ES 2.0
  but I have some problem. Output RGB image has a lot of GREEN color.
  This is code and images

  • 480x320 width & height :
  • 512x512 Texture width & height

  I got a YUV420p row data from ffmpeg AVFrame.

      for (int i = 0, nDataLen = 0; i < 3; i++) {
  
          int nShift = (i == 0) ? 0 : 1;
  
          uint8_t *pYUVData = (uint8_t *)_frame->data[i];
  
          for (int j = 0; j < (mHeight >> nShift); j++) {
  
              memcpy(&pData->pOutBuffer[nDataLen], pYUVData, (mWidth >> nShift));
  
              pYUVData += _frame->linesize[i];
  
              nDataLen += (mWidth >> nShift);
  
          }
  
      }

  and prepare texture for Y, U & V channel.

  //: U Texture
  
      if (sampler1Texture) glDeleteTextures(1, &sampler1Texture);
  
  
  
      glActiveTexture(GL_TEXTURE1);
  
      glGenTextures(1, &sampler1Texture);
  
      glBindTexture(GL_TEXTURE_2D, sampler1Texture);
  
  
  
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  
      // This is necessary for non-power-of-two textures
  
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  
      glEnable(GL_TEXTURE_2D);
  
  
  
      glTexImage2D(GL_TEXTURE_2D, 
  
                   0, 
  
                   GL_LUMINANCE, 
  
                   texW / 2, 
  
                   texH / 2, 
  
                   0, 
  
                   GL_LUMINANCE, 
  
                   GL_UNSIGNED_BYTE,
  
                   NULL);
  
  
  
      //: V Texture
  
      if (sampler2Texture) glDeleteTextures(1, &sampler2Texture);
  
  
  
      glActiveTexture(GL_TEXTURE2);
  
      glGenTextures(1, &sampler2Texture);
  
      glBindTexture(GL_TEXTURE_2D, sampler2Texture);
  
  
  
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  
      // This is necessary for non-power-of-two textures
  
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  
      glEnable(GL_TEXTURE_2D);
  
  
  
      glTexImage2D(GL_TEXTURE_2D, 
  
                   0, 
  
                   GL_LUMINANCE, 
  
                   texW / 2, 
  
                   texH / 2, 
  
                   0, 
  
                   GL_LUMINANCE,
  
                   GL_UNSIGNED_BYTE,
  
                   NULL);
  
  
  
      //: Y Texture
  
      if (sampler0Texture) glDeleteTextures(1, &sampler0Texture);
  
  
  
      glActiveTexture(GL_TEXTURE0);
  
      glGenTextures(1, &sampler0Texture);
  
      glBindTexture(GL_TEXTURE_2D, sampler0Texture);
  
  
  
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  
      // This is necessary for non-power-of-two textures
  
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  
      glEnable(GL_TEXTURE_2D);
  
  
  
      glTexImage2D(GL_TEXTURE_2D, 
  
                   0, 
  
                   GL_LUMINANCE, 
  
                   texW, 
  
                   texH, 
  
                   0, 
  
                   GL_LUMINANCE,
  
                   GL_UNSIGNED_BYTE, 
  
                   NULL);

  Rendering part is below.

  int _idxU = mFrameW * mFrameH;
  
  int _idxV = _idxU + (_idxU / 4);
  
  
  
  // U data
  
  glActiveTexture(GL_TEXTURE1);
  
  glBindTexture(GL_TEXTURE_2D, sampler1Texture);
  
  glUniform1i(sampler1Uniform, 1);
  
  
  
  glTexSubImage2D(
  
                  GL_TEXTURE_2D, 
  
                  0, 
  
                  0, 
  
                  0, 
  
                  mFrameW / 2,            // source width
  
                  mFrameH / 2,            // source height
  
                  GL_LUMINANCE,
  
                  GL_UNSIGNED_BYTE, 
  
                  &_frameData[_idxU]);
  
  
  
  // V data
  
  glActiveTexture(GL_TEXTURE2);
  
  glBindTexture(GL_TEXTURE_2D, sampler2Texture);
  
  glUniform1i(sampler2Texture, 2);
  
  
  
  glTexSubImage2D(
  
                  GL_TEXTURE_2D, 
  
                  0, 
  
                  0, 
  
                  0, 
  
                  mFrameW / 2,            // source width
  
                  mFrameH / 2,            // source height
  
                  GL_LUMINANCE,
  
                  GL_UNSIGNED_BYTE,
  
                  &_frameData[_idxV]);
  
  
  
  // Y data
  
  glActiveTexture(GL_TEXTURE0);
  
  glBindTexture(GL_TEXTURE_2D, sampler0Texture);
  
  glUniform1i(sampler0Uniform, 0);
  
  
  
  glTexSubImage2D(
  
                  GL_TEXTURE_2D, 
  
                  0, 
  
                  0, 
  
                  0, 
  
                  mFrameW,            // source width
  
                  mFrameH,            // source height
  
                  GL_LUMINANCE,
  
                  GL_UNSIGNED_BYTE,
  
                  _frameData);

  Vertex Shader & Fragment Shader is below.

  attribute vec4 Position;
  
  attribute vec2 TexCoordIn;
  
  
  
  varying vec2 TexCoordOut;
  
  varying vec2 TexCoordOut_UV;
  
  
  
  uniform mat4 Projection;
  
  uniform mat4 Modelview;
  
  
  
  void main()
  
  {
  
      gl_Position = Projection * Modelview * Position;
  
      TexCoordOut = TexCoordIn;
  
  }
  
  
  
  
  
  
  
  uniform sampler2D sampler0; // Y Texture Sampler
  
  uniform sampler2D sampler1; // U Texture Sampler
  
  uniform sampler2D sampler2; // V Texture Sampler
  
  
  
  varying highp vec2 TexCoordOut;
  
  
  
  void main()
  
  {
  
      highp float y = texture2D(sampler0, TexCoordOut).r;
  
      highp float u = texture2D(sampler2, TexCoordOut).r - 0.5;
  
      highp float v = texture2D(sampler1, TexCoordOut).r - 0.5;
  
  
  
      //y = 0.0;
  
      //u = 0.0;
  
      //v = 0.0;
  
  
  
      highp float r = y + 1.13983 * v;
  
      highp float g = y - 0.39465 * u - 0.58060 * v;
  
      highp float b = y + 2.03211 * u;
  
  
  
      gl_FragColor = vec4(r, g, b, 1.0);
  
  }

  Y Texture (Grayscale) is correct but U & V has a lot of Green Color.
  So final RGB image (Y+U+V) has a lot of GREEN Color.
  What's the problem ?

  Please help.
  thanks.