Video bitrate copy to pc

Hello,

I usually copy all photos and videos to my pc (iPhone - cable - windows explorer) for working with them on my NAS etc.

Since upgrade to IOS 15 the folder structure differs but that is OK. But videos now have about half of the bitrate (and size) than before (If I select the same video backup before and compare).

How can I get the videos off the iPhone with original/full bitrate? Airdop also reduces the bitrate during transfer....

Thanks