I have a large directory of small video clips taken with a cell phone. I've been able to use mp4box to concatenate them into a single file nicely EXCEPT if they are different aspect ratio. In this case it is when I try to combine a video taken with the phone upright vs. taken side ways.
mp4box.exe -cat long.mp4 -cat wide.mp4 broken.mp4
mp4box is saying:
WARNING: Concatenating track ID 1 with different SPS - result file might be brok en
When I play the video it clearly blocky and corrupted.
Is there a way to merge these files with mp4box or any other command line tool and force a single (probably 16:9) format?
Also even better, since I am doing this in an automated fashion, it would be nice to have a way to just force all of the output video to a single format rather than have to perform special actions on just the upright videos.
I've tried resetting or forcing the SPS, but I can't seem to get it right.