Actually, digital 8 and mini DV are recorded at 30 Hz non-interlaced. So even running handbrake in the end you only need to do 60 Hz at most. I'm of the argument that your brain can't really see any over 30 Hz in gamers like high-speed refresh because of the latency of the video processing which is smaller on the higher-speed. So therefore they get faster response time in the computer. I was never much of a gamer because writing code in the Nvidia graphics engine may it seem like I was going to work.
So I argue that running de-interlaced on 30 Hz is okay. I did run into a problem that if you're going to image stabilize digital 8 or miniDV with these later versions (later than version 8.95) you must say it is interlaced with the lower field 1st in the image stabilization part. Because handbrake also must be informed that is interlaced otherwise you can visually see a problem in the video.
