I have read about cutting and splicing using concat but this is not enough for me.
I would like to cut marked video parts and join into single video file without re-encoding. Is it possible to cut and merge (in memory) in one go?
There should be no theoretical limit on the number of video parts to cut or join. Audio should be in sync.
From the answers I learned that video re-encoding is still needed.
I would like to clarify that cutting video clips from the middle of a video file might be done in multiple steps. I was thinking that processing the video in one go would be performance wise by saving some I/O activity. However it is not an objective in itself.