In Cubase 12, I have the video and audio tracks both in linear timebase. Both are positioned at Bar 1, and the timecode is at zeros there. I have a tempo track with the tempo value there at 120bpm.
If I need to adjust the tempo that is at the start of the video Then the video and audio track shift from bar 1. I want them to always start on bar one regardless of the tempo, and the timecode at Bar 1 to always be at zero.
If your project starts at 1. 1. 1. 0, then the 1st frame will always sit at this position. If you project starts at 0. 1. 1. 0, then you can add another Tempo Event at the 1. 1. 1. 0 position. Then the 0. 1. 1. 0 - 1. 1. 1. 0 will always be in the 120BPM tempo.
Thanks. Funny, I just discovered that. If I put a tempo event at the position of the start of the video, and do not move that event forward or backward, then I can add tempo events prior and the video remains at the correct time.
But FYI, in my project I have set up bars prior to bar 1 (“Display Bar Offset” in the Project Settings) for setting up MIDI controller data, etc., so having the video start at 1. 1. 1. 0 is no different than having it start anywhere else.