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• Full C++ example avlib\FFMPEG multi input video filtering [on hold]

  30 juillet 2018, par Stefan Pintilie

  I am asking a question and also answering to it, on how to apply a multi input video complex filter using FFMPEG/avlib/avfiler libraries. I am doing this in hope that will help you, since it took couple of days to dig into ffmpeg code source, understanding it, putting the pieces together and make it work. The same could be applied to audio filtering.

  Everything starting from translating the following ffmpeg command into C++ code :

  ffmpeg -i world.mp4 -i back.png -filter_complex "[0:v]pad=1280:1000:0:0:black[pad];[pad][1:v]overlay=140:720[out]" -map "[out]" -map 0:a output.mp4

  Is basically stacking 2 videos on top of each other. The video from bottom has bigger width, so the final video file has the width of the bottom video and the height of all 2 together.

  Anyway that is just an example, the code example I am going to give you it takes any number of input files and a complex filter description, then producing the output.

• fftools/qsv : add extra_hw_frames support

  25 juillet 2018, par Zhong Li

  fftools/qsv : add extra_hw_frames support
  Currently extra_hw_frames can't be applied to qsv since it
  
  doesn't call function avcodec_get_hw_frames_parameters().
  Give an option to fix ticket #7261 though it is not a perfect soultion
  
  (allocate the minimum pool size internally and automatically).
  Signed-off-by : Zhong Li <zhong.li@intel.com>
  

  • [DH] fftools/ffmpeg_qsv.c

• ffmpeg compile for Android

  1er novembre 2018, par amar Kumar

  I’m trying to compile ffmmpeg for android using this but I’m getting " ERROR : freetype2 not found" as shown below in details.

  linux@user1:~/Downloads/android-ffmpeg$ ./configure_ffmpeg.sh
  
  ~/Downloads/android-ffmpeg ~/Downloads/android-ffmpeg
  
  No NDK_BASE set, using /opt/android-ndk
  
  patching file ffmpeg/libavfilter/Makefile
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  2 out of 2 hunks ignored
  
  The next patch would create the file ffmpeg/libavfilter/af_aredact.c,
  
  which already exists!  Skipping patch.
  
  1 out of 1 hunk ignored
  
  patching file ffmpeg/libavfilter/allfilters.c
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  2 out of 2 hunks ignored
  
  The next patch would create the file ffmpeg/libavfilter/vf_redact.c,
  
  which already exists!  Skipping patch.
  
  1 out of 1 hunk ignored
  
  patching file ffmpeg/libavutil/arm/intmath.h
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  2 out of 2 hunks ignored
  
  patching file libavcodec/arm/ac3dsp_armv6.S
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  1 out of 1 hunk ignored
  
  patching file libavcodec/arm/fft_fixed_neon.S
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  1 out of 1 hunk ignored
  
  patching file libavcodec/arm/fft_neon.S
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  2 out of 2 hunks ignored
  
  patching file libavcodec/arm/sbrdsp_neon.S
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  2 out of 2 hunks ignored
  
  patching file libavcodec/arm/vp3dsp_neon.S
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  1 out of 1 hunk ignored
  
  patching file libavcodec/arm/vp8_armv6.S
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  2 out of 2 hunks ignored
  
  patching file libavcodec/arm/asm.S
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  3 out of 3 hunks ignored
  
  patching file libavutil/arm/intmath.h
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  3 out of 3 hunks ignored
  
  patching file configure
  
  Reversed (or previously applied) patch detected!  Skipping patch.
  
  1 out of 1 hunk ignored
  
  ~/Downloads/android-ffmpeg/ffmpeg ~/Downloads/android-ffmpeg ~/Downloads/android-ffmpeg
  
  *****************The error is here*****************
  
  
  
  ERROR: freetype2 not found
  
  
  
  If you think configure made a mistake, make sure you are using the latest
  
  version from Git.  If the latest version fails, report the problem to the
  
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "config.log" produced by configure as this will help
  
  solving the problem.

  I have freetype installed and I also linked it as shown below in the /usr/include/

  rwxr-xr-x  3 root root   4096 Mar 20 22:13 freetype2
  
  lrwxrwxrwx  1 root root     23 Mar 20 22:14 freetype -> /usr/include/freetype2/

  I’m not sure what to do next, can you please help ?