It would appear that Broadcast Television is often 1080i30 (60 fields/s), and non-movie DVDs (example, instructional or TV shows) are 60fields/s as well, at some lower resolution (480i?)

However, almost all video that ends up on the internet, whether in x264-encoded content, Youtube, etc. is 30 frames per second, that is to say , it is progressive scan. However, when you watch content on your TV, I'm guessing the TV converts it to progressive for you, but the end result is a very fluid picture that "feels" quite a bit like 60frames/s.

What is the best way to obtain this result when ripping interlaced content sourced from TV or DVDs? Can I rip a DVD that is 60 fields per second to 60 frames per second? I would imagine classic deinterlace filters do not do this, they merge fields and create a 30fps output.

I'm using handbrake.