Video differences

We now have a video diff application. Here is a processed version of the clip posted previously. It looks pretty promising, and better than I expected. Right now, it compares all subsequent frames with the first frame captured from the camera, but we eventually want to diff from the previous frame instead (to account for changes in scenery/time of day).

The current code for the video diff program is on Subversion, at svn://svn.lifeafterking.org/cse190/videodiff/. To compile:

gcc -O2 -march=pentium4 -mtune=pentium4 -mmmx -g -o videodiff videodiff.c

To run:

ffmpeg -vcodec ppm -f image2pipe | ./videodiff | ffmpeg -vcodec pgm -f image2pipe -i - -vcodec mpeg4 [output file]

And there you have it. :)