Automatically sync video with beep

[spuder]

Feature request: Credit Joshua Bardwell. See 15:10 in this video

Syncing flight video with blackbox logs is tedious at best.

Idea 1: audible beep on arm

What if log-viewer would automatically recognize the arm beep as the start of a flight. The log-viewer could auto line up video with the logs.

idea 2: OSD display on arm

If using a board with built in OSD, it could flash a code in the corner of the screen that log-viewer could identify as the start of a flight and auto align logs with video.

Additionally the beep could encode some unique data (craft name, log number) into the beep so that the logger could handle video with multiple quads arming in quick succession (such as at a race).