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• libavformat split audio file into segments

  10 juillet 2021, par Julian F. Weinert

  I'm trying to implement a feature of ffmpeg within my own project. It consists of chopping up an audio file into small segments using a cut list.

  


  It works pretty well in the command line :

  


  ffmpeg -i input.wav -f segment -ss 1368.26458 -segment_times 1569.83750,1764.75938,1970.09375,2152.77604 -to 2362.36354 -map 0 -c:a copy %03d_output.wav


  


  During my research I came across libavformat/segment.c which looks pretty much exactly like what I need. The problem is that I'm absolutely unable to find an exposed interface or some reference to that in the documentation.

  


  How would I go about doing this using the libav* libraries ?

  


• MAINTAINERS : Add Haihao Xiang for vaapi

  14 décembre 2021, par U. Artie Eoff

  MAINTAINERS : Add Haihao Xiang for vaapi
  Current listed maintainers for vaapi plugin are
  
  not reponsive and/or currently active in the
  
  ffmpeg community.  Thus, vaapi plugin patches
  
  (and qsv plugin) have generally gone ignored or
  
  lost in the ether for too long.
  Remove Gwenole Beauchesne from vaapi maintainer
  
  who has not been active since 2016.
  Current alternative maintainer for vaapi is Mark
  
  Thompson whom has not been active since
  
  March/April 2021.
  Therefore, add Haihao Xiang to vaapi maintainer
  
  who's primary role is FFmpeg development with a
  
  focus on the vaapi and qsv plugins.  Haihao has
  
  over a decade of media experience and many years
  
  of FFmpeg development experience, amongst other
  
  media frameworks.
  The additional patch for adding Haihao as qsv
  
  plugin maintainer has been submitted previously :
  https://patchwork.ffmpeg.org/project/ffmpeg/patch/20210608141134.27448-1-zhongli_dev@126.com/
  This will help FFmpeg to continue to be the leading
  
  multimedia framework by allowing these plugins to be
  
  actively improved, enhanced, and maintained for existing
  
  and future HW platforms.
  Signed-off-by : U. Artie Eoff <ullysses.a.eoff@intel.com>
  

  • [DH] MAINTAINERS

• Application using FFMPEG Library does not compile with CMAKE error avformat_alloc_context but I have imported the header files and libray

  23 mai 2022, par Clockman

  I compiled the FFMPEG source file myself and got the header and library files in an include and bin folder respectively, the target platform is Windows 10. I also setup my cmakelist.txt to find and include both the library and header files. The application finds the path or so it seems because during compilation I get a "LNK2019 error unresolved external symbol avformat_alloc_context referenced in function main". Below is an extract from my cmake list ; I will like to note that I got the .lib and .dll versions of the library hence the approach below based on the book "professional cmake" and other stackflow examples.

  


  ProjectDir/AudMan/cmakelist.txt

  


  list(APPEND CMAKE_PREFIX_PATH ${CMAKE_PREFIX_PATH};PATH-TO-INCLUDES;PATH-TO-LIBRARY)
find_path(AVFORMAT_INCLUDE_DIR libavformat/avformat.h)
find_library(AVFORMAT_LIBRARY avformat)
add_library(ffmpegHeaders INTERFACE)
target_include_directories(ffmpegHeaders INTERFACE ${AVFORMAT_INCLUDE_DIR})


  


  ProjectDir/cmakelist.txt

  


  set(Rapid_Prefix PATH-TO-LIBRARY)
    add_library(AVformat SHARED IMPORTED)
    set_target_properties(AVformat PROPERTIES IMPORTED_LOCATION ${Rapid_Prefix}/avformat-59.dll IMPORTED_IMPLIB ${AVFORMAT_LIBRARY})
target_link_libraries(App_target PRIVATE AVformat)


  


  A sample of the codes is this

  


  extern "C" {&#xA;#include <libavcodec></libavcodec>avcodec.h>&#xA;#include <libavformat></libavformat>avformat.h>&#xA;}&#xA;&#xA;int main()&#xA;{&#xA;    AVFormatContext* format = avformat_alloc_context();&#xA;    if (avformat_open_input(&amp;format, R"(\test.m4a)", NULL, NULL) != 0) {&#xA;        fprintf(stderr, "Could not open file &#x27;%s&#x27;\n", R"(\test.m4a)");&#xA;        return -1;&#xA;    }&#xA;    if (avformat_find_stream_info(format, NULL) &lt; 0) {&#xA;        fprintf(stderr, "Could not retrieve stream info from file &#x27;%s&#x27;\n", R"(test.m4a)");&#xA;        return -1;&#xA;    }&#xA;    return 0;&#xA;}&#xA;

  


  I have been at it for about five days and will appreciate any help I can get.