Extracts the Y-Plane (luma) from yuv420p encoded I-Frames using libav to portable graymap format.
Careful, very experimental. valgrind agrees, this definitely leaks memory. More of a proof of concept for certain types of vision extraction from video files on high quality image frames.
build with make. needs various av libraries from ffmpeg (libavcodec, libavutil, libavform), need to check packages.