I use an app called Harry's LapTimer Pro on my iPhone to gather similar info when racing. The app can overlay the info onto video shot with the iPhone. I found that I was also able to import video shot from other cameras (like my GoPro HD) and have it apply the overlay, as the info is stored in a text file, similar to your scenario. Upon digging further, I found a program called DashWare; I believe it's Windows only, so you may need to run it in a VM or on a windows box, but it may get you what you need:
http://www.dashware.net/