There must be a way, but in my experience they all suck unless you very precisely know your content. All of the modern flat panel TV's do this with their motion

There must be a way, but in my experience they all suck unless you very precisely know your content. All of the modern flat panel TV's do this with their motion smoothing, because the panel and the content are generally at different rates. If you've ever watched something with motion smoothing, well it looks strange because that's not how we're used to seeing it, but it can look better in some scenes smoothing out long panning shots or where things tend to flow consistently in the same direction. Where it totally fails is when movement is less predictable. Then you get this odd looking mess of things moving to slow or too fast at times as it's trying to correct for missed predictions. I don't know if any free tools, maybe ffmpeg, to do this but maybe something out there You could straight frame double which would get you to the frame rate... But it wouldn't look any smoother.