[transcode-users] add a jpg to the end of an mpg

[Carl Karsten]

Part of a weather station is a web cam pointed at the horizon.  Want to have a 
web page with a few "last X hour" links that will do a few seconds of time laps.

Plan A: generate a .mpg every time someone clicks.  that's lame.
Plan B: add the jpg's to one big .mpg as the jpgs come in. then slice off the 
last X frames and serve that up.

I can do A.  don't want to.  I want to do B, so how do I add a .jpg to an mpg?

Carl K