>>481I do this too sometimes. I use a program called Kinovea, what's nice about it is that you can draw on top of the video and number the key frames, mark off distances and arcs, draw time charts, write notes etc. You can also re-save the video with the notes intact for future reference. Also make sure to disable persistence in the options if you don't your notes with be visible for the whole duration of the video instead of the individual frame you're writing notes for.