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• vf_colorspace : Add support for full range yuv

  26 août 2016, par Vittorio Giovara

  vf_colorspace : Add support for full range yuv
  Whenever a full range video is input, since the YUVJ* formats are not
  
  listed as supported for this filter, a range reduction takes place
  
  through the auto-inserted format filter, forcing the conversion to
  
  operate on a limited range,
  However the filter handles full range videos perfectly fine, so adding
  
  support to YUVJ* formats will allow skipping a conversion step, while
  
  providing completely identical results.
  Signed-off-by : Vittorio Giovara <vittorio.giovara@gmail.com>
  
  Reviewed-by : "Ronald S. Bultje" <rsbultje@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavfilter/vf_colorspace.c

• Revert to also converting parameters of range method to numbers. Closes gh-702

  22 mars 2013, par jcbowman

  Revert to also converting parameters of range method to numbers. Closes gh-702
  Unlike min/max, there's no range attribute in html5. For dates, min/max can be used.
  

• Ffmpeg to OpenGL texture black screen

  23 janvier 2014, par user3177342

  I am trying to make textures from ffmpeg source, but I get the black screen.

  here is the code

  avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished,
  
              &packet);
  
  
  
          // Did we get a video frame?
  
          if(frameFinished)
  
          {
  
           f++;
  
  
  
                  pFrameRGB=avcodec_alloc_frame();
  
                  struct SwsContext* swsContext = sws_getContext(pCodecCtx->width, pCodecCtx->height,
  
                          pCodecCtx->pix_fmt,
  
                          pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_RGB24, SWS_BICUBIC,
  
                          NULL, NULL, NULL);
  
                  if (swsContext == NULL) {
  
                   fprintf(stderr, "Cannot initialize the conversion context!\n");
  
                    exit(1);
  
                    };
  
  
  
  
  
                  sws_scale(swsContext, pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameRGB->data, pFrameRGB->linesize);
  
                  glGenTextures(1, &VideoTexture);
  
                  glBindTexture(GL_TEXTURE_2D, VideoTexture);
  
                  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  
                  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  
                  glTexImage2D(GL_TEXTURE_2D, 0, 3, pCodecCtx->width, pCodecCtx->height, 0, GL_RGB, GL_UNSIGNED_BYTE, pFrameRGB->data[0]);
  
   }
  
  }
  
  
  
  // Free the packet that was allocated by av_read_frame
  
  av_free_packet(&packet);
  
  if (f>1) break;

  Strangerly when I draw i get black screen, my video is not black.

  if (VideoTexture != 0)
  
      {
  
          glEnable(GL_TEXTURE_2D);
  
          glPushMatrix();
  
          glBindTexture(GL_TEXTURE_2D, VideoTexture);
  
          glBegin(GL_QUADS);
  
          glTexCoord2i(0, 0); glVertex2i(0, 0);
  
          glTexCoord2i(1, 0); glVertex2i(Width, 0);
  
          glTexCoord2i(1, 1); glVertex2i(Width, Height);
  
          glTexCoord2i(0, 1); glVertex2i(0, Height);
  
          glEnd();
  
          glPopMatrix();
  
          glDisable(GL_TEXTURE_2D);
  
      }