Invalid String Position on Video Import

[NickyD]

Hi folks

I installed the codecs OK and the video previews fine, but I'm trying to import video 1920x1080 .mp4 and I get the mysterious "Invalid String Position" error
I've tried fiddling with the import settings but I'm  pretty clueless
Stills from the same camera work a treat, though

Win 10

Ta

Nikcy

[NickyD]

I've run it through VLC, exporting as an .mp4 again and it works fine. I think its to do with the codec that the DJI Pocket 2 is using.