https://www.ffmpeg.org/doxygen/2.7/libnut_8c.html
FFmpeg: libavformat/libnut.c File Reference
ffmpegcfile
https://stuff.mit.edu/afs/sipb.mit.edu/user/mkgray/oldfiles/ath/jik/sipbsrc/sun4c_51/Mosaic-2.7b5/libnut/
Index of /afs/sipb.mit.edu/user/mkgray/oldfiles/ath/jik/sipbsrc/sun4c_51/Mosaic-2.7b5/libnut