ok i am so dumb. i found my solution to my stupid problem with your comment.
I was here to seek solution about my render output of my sequencer was always black image. After debuging with 30 scenarios on/off settings combo. i have red your comment about re-adding the light.
AND I just remember that my project was an old project with multiple directionnal lights toggeling with “Actor hidden in game”.
I have done this to use the same scene with differents moment of the day/night for my short movie.
SO ! check your lights settings !