I would like to make a video(fragmented mp4) to start at specific time.
For example, if the fragmented video segment is for 4sec timestamp, I would like the video(fmp4) to start at 4sec and no video before that time.
I think 'base media decode time' in moof/traf/tfdt atom path is the time when the fmp4 actually starts and I searched how to change the field but there was no information.
My question is,
Is there any way or tool to achieve what I need?