Makefile for encoding multiple png image files into a short animation

Makefile

files = *.png
fps   = 30

.PHONY: all avi mp4 h264 help
all: avi mp4 h264

avi:
	mencoder 'mf://$(files)' -mf type=png:fps=$(fps) -ovc lavc -lavcopts vcodec=wmv2 -o animation.avi

mp4:
	mencoder 'mf://$(files)' -mf type=png:fps=$(fps) -ovc lavc -lavcopts vcodec=mpeg4 -o tmp.avi
	x264 -o mpeg4-version.mp4 tmp.avi
	rm tmp.avi

h264:
	mencoder 'mf://$(files)' -mf type=png:fps=$(fps) -ovc x264 -x264encopts subq=5:8x8dct:frameref=2:bframes=1 -o tmp.avi
	x264 -o h264-version.mp4 tmp.avi
	rm tmp.avi

clean:
	rm -rf *.png *.avi *.mp4

help:
	@echo 'default parameters:'
	@echo '        files:     $(files)'
	@echo '        fps:       $(fps)'