"Elastic Aspect", aka "dynamic stretching" - anything like it for kdenlive?

4:3 GoPro Footage Explained - http://abekislevitz.com/43-gopro-footage-explained/

responding to self - there's probably a better way, but this gives decent results stretching out 4:3 960p footage (from an HD-HERO-1) to 16:9 1080p:

DeFish filter
• amount: 738
• defish: yes
• type: equidistant
• scaling: fill
• interpolator: as desired
• aspect type: manual
• manual aspect: 1000