What command line are you using?
I’m guessing you’re talking to me?
ffmpeg -i input.mp4 -c copy output.mp4
Altho I usually use Format Factory and choose the options to copy video and audio codec.
There are times where this doesn’t solve it I’ve noticed and you need to actually re-encode. For those cases I recommend HandBrake.
I was and Thank you. I figured it was a simple command line but wasn’t sure if you were adding anything extra. Will give it a try next time I run into the issue.