ProRes 422 HQ with black background. Use an unmult effect to remove the black background.

Pro tip: Use the 'tint' effect & pick the colour of the snow from your shot to match it instantly.

Resolutions: 4K (3840x2160) 
Frame Rate: 24fps
Formats: ProRes 422 HQ
Length: 15 seconds
Colour space: Rec 709