Use Q in gource to see the "log position" to be used with --start-position and
--stop-position .

Use -c with a value greater than 1.0 to speed up the animation even further.

Use -H to see all the possible gource options.

FFMpeg encoding quality and options are practically arbitrary. Now the video is
720p (-1280x720), but consider increasing the bitrate (-b) or improve quality some
other way.

gource --logo artwork/gemrb-logo.png --title "GemRB development 2012" \
  --seconds-per-day 1 --auto-skip-seconds 1 \
  -p 0.8447  -1280x720 -o - |
ffmpeg -y -r 60 -f image2pipe -vcodec ppm -i - -vcodec libvpx -b:v 10000K gource.webm

