I'm using dashwire to add different gauges to my videos from the flight data records.  Would like to know if there is a list of all of the telemetry data contained in the file anywhere.  In particular, does anyone know if the drone direction (not flight direction) *and* camera direction data is available?  I think it'd be cool to display flight direction, directon drone is facing and direction of camera as possibilities.

I don't know the answer to the flight records question, but the mp4 metadata may be of considerable interest to you.  Of course that doesn't help if you weren't recording at the time, but it's better than nothing.

Not sure if this will help but it will give you all the metadata.

https://www.sno.phy.queensu.ca/~phil/exiftool/

That appears to be for extracting data from photo/images, (EXIF data), and I don't see anything in the documentation that relates to the .csv data file created by Litchi that would work.