- If you are using a videocard like Blackmagic, then there is a checkbox to compensate for the latency.
- If you are using the fixed videoplayer, then the delay occurs when you are using (too) heavily compressed video.
There are many threats which explain why an mp4 never can be frame accurate.
There are only 3 codecs which guarantee frame-correct playback: Dndx, ProRes and Photo Jpeg.
And in addition to that, the video track can never-ever be used as “correct” guide track, simply because it never is and never can’t be.
Fredo