gource

gource -1024×768 –stop-position 1.0 –highlight-all-users –hide-filenames –seconds-per-day 5 –output-framerate 60 –output-ppm-stream output.ppm ffmpeg -y -r 60 -f image2pipe -vcodec ppm -i output.ppm -vcodec wmv1 -r 60 -qscale 0 out.wmv The key was the image2pipe format which seems to extract all the frames from the ppm rather than treating it as an individual image.