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• Reliably get PTS values in ffmpeg ?

  21 novembre 2013, par karl_

  I'm trying to write a method that will provide the next frame and presentation time stamp when queried. The code currently looks something like this :

  while( getNextFrame(image, pts) )
  
  {
  
      // show current image
  
      drawImage(currentImage);
  
      sleep(pts);
  
      currentImage = image;
  
  }

  I've been following the Dranger tutorials to this point, but have stalled on reliably getting a PTS value for frames (http://www.dranger.com/ffmpeg/tutorial05.html). The PTS values returned are always 0.

  Also, get_buffer() has been deprecated, so I'm now using the get_buffer2() method to set the global pts value. However, the release_buffer method has also been deprecated and I can't seem to find it's replacement. This leads me to believe that the method laid out in the tutorials may no longer be the best way of accomplishing this task.

  In short, using up to date ffmpeg, what's the best way to grab frame pts values reliably ?

• Revision 03fe08ca30 : Deprecate the use of PARTITION_INFO from encoder Use b_mode_info to store the i

  7 octobre 2013, par Jingning Han

  Changed Paths :
   Modify /vp9/encoder/vp9_bitstream.c

  
   Modify /vp9/encoder/vp9_block.h

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_encodemv.c

  
   Modify /vp9/encoder/vp9_firstpass.c

  
   Modify /vp9/encoder/vp9_onyx_if.c

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Deprecate the use of PARTITION_INFO from encoder

  Use b_mode_info to store the inter prediction mode of sub8x8 block,
  in replacement of the use of partition_info. Remove redundant buffer
  update for partition_info. For bus_cif at 2000 kbps, this seem to make
  speed 0 about 1% faster.

  Change-Id : Id1b3be45e75a24fb4b42335ac480c23e440978f6

• SDL2.0 Alternative for SDL_Overlay

  2 février 2017, par Josh

  So I’ve been trying to go through the following tutorial on ffmpeg : http://dranger.com/ffmpeg/tutorial02.html

  However, when I try to compile using gcc, I get the following output :

  root:/Users/mbrodeur/Downloads/HACKATHON CONTENT/Tutorials-> gcc -o tutorial02 tutorial02.c -lavutil -lavformat -lavcodec -lz -lavutil -lm -lswscale -D_THREAD_SAFE -lSDL2
  
  tutorial02.c: In function ‘main’:
  
  tutorial02.c:41: error: ‘SDL_Overlay’ undeclared (first use in this function)
  
  tutorial02.c:41: error: (Each undeclared identifier is reported only once
  
  tutorial02.c:41: error: for each function it appears in.)
  
  tutorial02.c:41: error: ‘bmp’ undeclared (first use in this function)
  
  tutorial02.c:98: warning: assignment makes pointer from integer without a cast
  
  tutorial02.c:110: error: ‘SDL_YV12_OVERLAY’ undeclared (first use in this function)

  Now, I read that SDL_Overlay is no longer used in SDL2, so therein lies the problem. I’ve been poking around, but can’t seem to find anything helpful. Is there a replacement for SDL_Overlay ? Is it necessary ?

  SDL_Overlay is used in the following context :

  SDL_Overlay     *bmp;
  
  bmp = SDL_CreateYUVOverlay(pCodecCtx->width, pCodecCtx->height,
  
                         SDL_YV12_OVERLAY, screen);