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• ffmpeg decode, get avFrame(yuv420p), yuv to rgb by shader, but it is so green

  6 mai 2019, par Wei Chen

  

  I use ffmpeg to decode xxx.mp4 and get YUV420p AVFrame. Then I render the yuv data by shader, but it is so green !

  uTextureYLocation = glGetUniformLocation(program, uTextureY);
  
  glActiveTexture(GL_TEXTURE0);
  
  glBindTexture(GL_TEXTURE_2D, yTexture);
  
  glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, avFrame->width, avFrame->height, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, avFrame->data[0]);
  
  glUniform1i(uTextureYLocation, 0);
  
  
  
  uTextureULocation = glGetUniformLocation(program, uTextureU);
  
  glActiveTexture(GL_TEXTURE1);
  
  glBindTexture(GL_TEXTURE_2D, uTexture);
  
  glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, avFrame->width / 2, avFrame->height / 2, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE,
  
               avFrame->data[1]);
  
  glUniform1i(uTextureULocation, 1);
  
  
  
  uTextureVLocation = glGetUniformLocation(program, uTextureV);
  
  glActiveTexture(GL_TEXTURE2);
  
  glBindTexture(GL_TEXTURE_2D, vTexture);
  
  glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, avFrame->width / 2, avFrame->height / 2, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE,
  
               avFrame->data[2]);
  
  glUniform1i(uTextureVLocation, 2);

• FFMPEG Green Screen from raw pictures

  21 août 2016, par Mohammad Abu Musa

  I am writing a screen recorder, I get raw data from Chrome and I want to covert it to webm files. I manged successfully to export the videos with the correct periods but the issue that I get a green screen instead of the screen capture. I am not sure what could be wrong.

  Is it writing to file ? or passing the parameters to fwrite function ?

  void EncoderInstance::OnGetFrame(int32_t result, pp::VideoFrame frame) {
  
      if (result != PP_OK)
  
          return;
  
  
  
      const uint8_t* data = static_cast<const>(frame.GetDataBuffer());
  
      pp::Size size;
  
      frame.GetSize(&amp;size);
  
      uint32_t buffersize = frame.GetDataBufferSize();
  
  
  
  
  
      if (is_recording_) {
  
          vpx_codec_iter_t iter = NULL;
  
          const vpx_codec_cx_pkt_t *pkt;
  
          // copy the pixels into our "raw input" container.
  
          int bytes_filled = avpicture_fill(&amp;pic_raw, data, AV_PIX_FMT_YUV420P, out_width, out_height);
  
          if(!bytes_filled) {
  
              Logger::Log("Cannot fill the raw input buffer");
  
              return;
  
          }
  
  
  
          if(vpx_codec_encode(&amp;codec, &amp;raw, frame_cnt, 1, flags, VPX_DL_REALTIME))
  
                die_codec(&amp;codec, "Failed to encode frame");
  
  
  
          while( (pkt = vpx_codec_get_cx_data(&amp;codec, &amp;iter)) ) {
  
              switch(pkt->kind) {
  
                  case VPX_CODEC_CX_FRAME_PKT:
  
                      glb_app_thread.message_loop().PostWork(callback_factory_.NewCallback(&amp;EncoderInstance::write_ivf_frame_header, pkt));
  
                      glb_app_thread.message_loop().PostWork(callback_factory_.NewCallback(&amp;EncoderInstance::WriteFile, pkt));
  
                      break;
  
                  default:break;
  
              }
  
          }
  
  
  
          frame_cnt++;
  
      }
  
  
  
      video_track_.RecycleFrame(frame);
  
      if (need_config_) {
  
          ConfigureTrack();
  
          need_config_ = false;
  
      } else {
  
          video_track_.GetFrame(
  
                  callback_factory_.NewCallbackWithOutput(
  
                          &amp;EncoderInstance::OnGetFrame));
  
      }
  
  }
  
  </const>

• FFMpeg command output shows 'green pixelated' video

  18 janvier 2021, par DonX

  I am trying to take a single image and add audio resulting in a video playing the entire song with that single image ; much like you see for YouTube videos for songs. The command I am using is from this link : https://askubuntu.com/questions/868283/image-audio-mp4-how-to-make-video-smaller

  


  This is the command :

  


  ffmpeg -loop 1 -framerate 1 -i image.png -i song.aac -c:v libx264 -preset veryslow -crf 0 -c:a copy -shortest output.mp4


  


  It works as intended for having the video file be a small size, and the song plays as well, but depending on the image I used, some of the images appear 'Green' when playing the video.

  


  However though, this command works for any image used :

  


  ffmpeg -loop 1 -framerate 1 -i image.jpg -i music.mp3 -c copy -shortest output.mp4


  


  But the result is a very big file whereas I would like it to be smaller. Any help would be greatly appreciated ! Thank you !

  


  FFMpeg version : 4.3.1