Also, what would be helpful is if you could add to your forum profile under 'My Signature' a rundown on your computer and camera(s) details - as an example, click on the blue Signature link at the bottom of this comment.

In general I'd just use them as is unless you have problems. Footage that can be problematic include screen recordings with variable framerates or in containers like MKV; highly variable framerate phone footage; difficult to decode formats like 10-bit 422, etc.

For troublesome footage I like ShutterEncoder to re-encode or remux files. https://www.shutterencoder.com/

Thank you for your responses.

I have differents videos of different resolutions. 1920x1080, 1280x720, 640x360, etc
Framerates 24, 25, 29.7, 59
All mp4

The intended destination is YouTube/Vimeo.

Regards.
 

Well, you need to standardize on something. I'd suggest the framerate of your most used media and a resolution no lower than your output resolution (HD?) In the future try to at least match framerates and aspect ratio or if it's archival footage just accept it won't look quite right when upscaled/ framerate changed to match current footage.