[STI_TO_SS?]

At the track, use Harry's lap timer to record data.
Record video with Sony (lots of people using GoPro, but I do not like the distortion)

Edit/Shorten video(at home) with something like Adobe Premiere Elements or Microsoft moviemaker.

Then export data from smartphone (I email to a laptop). I synchronize the data and the video plus add gauges in DashWare.

All of the above takes a little work, but the costs are quite low.