Here is a list of all files with brief descriptions:

android_lts_support.c
ffmpegkit.c
ffmpegkit.h
ffmpegkit_abidetect.c
ffmpegkit_abidetect.h
ffmpegkit_exception.c
ffmpegkit_exception.h
ffprobekit.c
ffprobekit.h
fftools_cmdutils.c
fftools_cmdutils.h
fftools_ffmpeg.c
fftools_ffmpeg.h
fftools_ffmpeg_demux.c
fftools_ffmpeg_filter.c
fftools_ffmpeg_hw.c
fftools_ffmpeg_mux.c
fftools_ffmpeg_mux.h
fftools_ffmpeg_mux_init.c
fftools_ffmpeg_opt.c
fftools_ffprobe.c
fftools_fopen_utf8.h
fftools_objpool.c
fftools_objpool.h
fftools_opt_common.c
fftools_opt_common.h
fftools_sync_queue.c
fftools_sync_queue.h
fftools_thread_queue.c
fftools_thread_queue.h