How to extract('demux') from 'mp4' video to get the encoded data(or elementary stream) using ffmpeg?

Question

How to demux from mp4 video to get the video(h264 format) elementary stream using ffmpeg command line ?

Thanks

Answer 1

ffmpeg -i input.mp4 -vcodec copy -bsf h264_mp4toannexb -an -f h264 output.h264