Testing strategy without real flight.

upload tlog file
upload video synced with tlog


system should:
1. extract timestamps, imu and gps from the tlog file. 
2. usually video and tlog aren't synchronized. So system should synchronize them by itself.
Usual test is done on the quadcopters, so usually it starts from the drone on the ground and ends with the drone on the ground. These sessions are clearly visible in the chart IMU data of the tlog file. So, system can check the duration of the video and events in IMU chart in tlog. Then it can analyze by IMU the moment of actual take off and sync them
3. then make SITL and provide IMU and frames to the gps denied onboard system