What does this program actually do?

Compilation on my mandrake system required me to change a couple of things, notably the Makefile, where a minimal change would be:

avi2pics: frame.o avi.o riff.o error.o avi2pics.o
g++ $(CPPFLAGS) frame.o avi.o riff.o error.o avi2pics.o -o avi2pics -ldv -lgdk_imlib `gtk-config --libs`

(but there are other issues here, such as hard coded include paths).

During execution, you have a fairly large memory leak - add:

gdk_imlib_destroy_image( im );

after the save.

Otherwise, adding command line switches to narrow down the exported frames, change the frame frequency (ie: 1 frame in 25) and image dimensions would be welcome. Raw DV support would also be very useful. Another useful thing would be the ability to select the output format (ie: jpg, png, ppm) with an optional pipe output for ppm :-).