Zend certified PHP/Magento developer

Converting Gopro 9 LRV files to Resolve Proxy files

I am trying to convert Go pro hero 9 LRV files so I can link it as proxy media in da vinci resolve using ffmpeg

First I change the LRV file to .mp4
LRV file is in 25 FPS so I need to up the frame rate to 50 FPS so that it can be used by resolve.
It also needs to have the same time code so I use the follwoing command to achieve both of these.
I also ensure to name the new file the same as the full res file

C:UsersglennVideosMaltatest>ffmpeg -i GL010061.mp4 -c:v libx264 -crf 23 -r 50 -c:a aac -map_metadata 0 GH010061.mp4

However when I try to link the proxy file in resolve it does not accept it. Can anyone help with this? Converting the LRV files would be a quick and easy way to have quick optimised media

Cheers Glenn