Install ffmpeg:

git clone git://source.ffmpeg.org/ffmpeg.git ffmpeg mkdir build_ffmpeg cd build_ffmpeg ../ffmpeg/configure –prefix=$HOME/other/install

Turn sequentially numbered frames into video with music:

ffmpeg -r 9 -i frame_100%02d.png -i ~/Downloads/kevin_macleod/8bit\ Dungeon\ Boss.mp3 -b:v 5000k -strict -2 -shortest anim_with_music.mp4

glob version no music (untested):

ffmpeg -r 9 -pattern_type glob -i '*.png' -b:v 5000k -strict -2 anim.mp4