Linear time code
SMPTE - Society of Motion Picture and Television Engineers
HOURS:MINUTES:SECONDS:FRAMES
timecode and frame rate are not the same thing
- genlock - generator locking
The solution to this problem is drop-frame timecode, which is sort of like leap year for timecode. At 29.97 fps, every minute (except minutes divisible by ten), you skip counting the first two frames. You know you’re looking at drop frame timecode because the colon between minutes and frames is usually replaced by a semicolon. -- https://www.davidheidelberger.com/2010/06/10/drop-frame-timecode/