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• avcodec/videotoolboxenc : add CBP/CHP profile

  3 juin 2023, par xufuji456

  avcodec/videotoolboxenc : add CBP/CHP profile
  The CBP/CHP profile has available with H264 in iOS 15.0.
  
  Official Doc : https://developer.apple.com/documentation/videotoolbox/kvtprofilelevel_h264_constrainedbaseline_autolevel
  Signed-off-by : Rick Kern <kernrj@gmail.com>
  

  • [DH] libavcodec/videotoolboxenc.c

• How to compile ffmpeg for Windows statically with MSYS2 environment ?

  17 janvier 2024, par username

  I want to build myself standalone statically linked ffmpeg binaries for Windows from official git source code with MSYS2 environment tools. But every time I get .exe file dynamically linked to mingw libraries that crashes with "The application was unable to start correctly (0xc000007b)" error even if I put required libbz2-1.dll, libiconv-2.dll and libwinpthread-1.dll libraries in it's folder.

  



  I'm running MSYS2 environment with

  



  msys2_shell.cmd -mingw64


  



  line, and use mingw64/mingw-w64-x86_64-gcc 8.2.1+20181214-1 compiler package. Then I run ./configure with

  



  ./configure --pkg-config-flags=--static --disable-shared --enable-static


  



  line - the best options I have googled at all my efforts. Then proceed with general

  



  make
make install


  



  sequence.

  



  As a result, I get binaries that run smoothly in MSYS2 environment itself, but when I run it from host Windows explorer or cmd, first of all it ask for libbz2-1.dll, libiconv-2.dll and libwinpthread-1.dll libraries and when I put them in binaries' folder, they crash with "The application was unable to start correctly (0xc000007b)" error.

  



  I've asked about this case at official https://ffmpeg.zeranoe.com/forum/viewtopic.php?f=5&t=6439 forum but still have no response for already 5 days.

  



  Regarding dynamic linking libraries somehow I got bandaid solution with removing *.dll.a files from mingw64\x86_64-w64-mingw32\lib folder. But it looks not very clean for me. I wish to know if it is possible to do static linkage with some compiler/make/linker parameters or with editing ./configure or Makefile files somehow ?

  



  Also 0xc000007b error still remaining.

  



  I've managed to have desired result with media-autobuild_suite based on the same MSYS2 environment, so I know it is possible to do this somehow. But I'm very new to all this *nix things so don't understand it's bash script at all, not to mention it is pretty sophisticated by itself. The only thing I see it's producing correct ffmpeg executables running under native Windows environment not requiring dlls listed above.

  



  According to all guides in internet I found at the moment, I should get standalone Windows executables with this toolset, but it just don't work and I'm stuck. Please, help.

  


• avcodec_find_decoder(CODEC_ID_MPEG2TS) always NULL

  21 janvier 2012, par mmoment

  I want to decode an incoming MPEG2-Transport Stream and then encode it to h264.
  Everything works fine with the h264 Codec, but the problem is that libavcodec doesn't seem to recognize the MPEG2-Transportstream. I am basically doing it analogue to the official example :

  http://ffmpeg.org/doxygen/trunk/decoding__encoding_8c-source.html

  ptrCodec = avcodec_find_decoder(CODEC_ID_MPEG2TS);

  ptrCodec is always NULL. Could anybody help me with this ?