Openshot is great, but when it comes to export GoPro video, there is no correct ratio (4/3, HD, while most HD format are 16/10).
But you can create a new Profile in:
Edit, Profiles
Generate profile:
- Name: GoPro HD
- Size: 1280×960
- Ratio aspect: 4 / 3
- Ratio pix: 1/1
- Frames per sec: 30000/1001
- Progressive
And another one (smaller)
- Name: GoPro
- Size: 960×720
- Ratio aspect: 4 / 3
- Ratio pix: 1/1
- Frames per sec: 30000/1001
- Progressive
Using theses profiles, you wont have windowboxes video when using R4 mode with Hero HD from GoPro.