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• avcodec/encode : Fix check for allowed LJPEG pixel formats

  6 avril 2021, par Andreas Rheinhardt

  avcodec/encode : Fix check for allowed LJPEG pixel formats
  The pix_fmts of the LJPEG encoder already contain all supported pixel
  
  formats (including the ones only supported when strictness is unofficial
  
  or less) ; yet the check in ff_encode_preinit() ignored this list in case
  
  strictness is unofficial or less. But the encoder presumed that it is
  
  always applied and blacklists some of the entries in pix_fmts when
  
  strictness is > unofficial. The result is that if one uses an entry not
  
  on that list and sets strictness to unofficial, said entry passes both
  
  checks and this can lead to segfaults lateron (e.g. when using gray).
  Fix this by removing the exception for LJPEG in ff_encode_preinit().
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/encode.c

• How to stream a opencv Mat with ffmpeg in c++

  28 octobre 2018, par cristian b

  I’m new here. I’m trying to stream some images processed with opencv on a LAN using ffmpeg.
  I saw this :
  Pipe raw OpenCV images to FFmpeg
  but it doesn’t work for me, it creates only noise. I think the data I’m sending are not in the right format.
  I also have a look to this :
  How to send opencv video’s to ffmpeg
  but (looking at the last answer) the option -f jpeg_pipe give me error.

  What I do now :

  • I have a RGB Mat called "composedImage"
  • I send in output with :
    std::cout << composedImage ;
    The output are the pixels values separated by comma
  • then I call :

  ./example | ffmpeg -f rawvideo -pixel_format bgr24 -video_size 160x120 -framerate 20 -i - -f udp ://192.168.1.79:1234

  • I try to read using VLC (it didn’t work) and with ffplay :

  ffplay -f rawvideo -pixel_format gray -video_size 160x120 -framerate 30 udp ://192.168.1.79:1234

  Here it seems so easy :
  http://ffmpeg.org/ffmpeg-formats.html#rawvideo

  I have also tried to write the image and sent it, but I have errors. Probably it tries to send before the image is complete.

  Thank you for your help.

• avfilter/vf_thumbnail : switch to query_func2

  20 juin, par Niklas Haas

  avfilter/vf_thumbnail : switch to query_func2
  Instead of enumerating a static list of planar formats to support, walk
  
  through the format list and enable all supported formats.
  As of writing, this generates the following format list :
  
   gbrap
  
   gbrap10le
  
   gbrap12le
  
   gbrap14le
  
   gbrap16le
  
   gbrp
  
   gbrp10le
  
   gbrp12le
  
   gbrp14le
  
   gbrp16le
  
   gbrp9le
  
   gray
  
   gray10le
  
   gray12le
  
   gray14le
  
   gray16le
  
   gray9le
  
   ya16le
  
   ya8
  
   yuv410p
  
   yuv411p
  
   yuv420p
  
   yuv420p10le
  
   yuv420p12le
  
   yuv420p14le
  
   yuv420p16le
  
   yuv420p9le
  
   yuv422p
  
   yuv422p10le
  
   yuv422p12le
  
   yuv422p14le
  
   yuv422p16le
  
   yuv422p9le
  
   yuv440p
  
   yuv440p10le
  
   yuv440p12le
  
   yuv444p
  
   yuv444p10le
  
   yuv444p12le
  
   yuv444p14le
  
   yuv444p16le
  
   yuv444p9le
  
   yuva420p
  
   yuva420p10le
  
   yuva420p16le
  
   yuva420p9le
  
   yuva422p
  
   yuva422p10le
  
   yuva422p12le
  
   yuva422p16le
  
   yuva422p9le
  
   yuva444p
  
   yuva444p10le
  
   yuva444p12le
  
   yuva444p16le
  
   yuva444p9le
  
   yuvj411p
  
   yuvj420p
  
   yuvj422p
  
   yuvj440p
  
   yuvj444p
  

  • [DH] libavfilter/vf_thumbnail.c