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“For NTSC, I know that 29.97fps is the usual framerate, but how many frames should I actually render per each second.”
Someone once told me that interlace SD is 30fps because it’s 60 fields but if you are doing progressive it’s 29.97fps.
“Also, what dimension should I use.”
It’s 720X480 for 4:3 SD. Technically it’s 720X525 but the extra 45 lines are for metadata. So go with 720X480.
For the HD footage is 1920X1080
“For the HD footage, 1080i is preferable, but would progressive be better than interlace.”
I don’t do animations, but when shooting I know interlace is better for fast motion and will be more crisp but progressive is better for slow-mo and freeze frames. But 60p is the best of both worlds. It’s a fast enough framerate for progressive to be crisp and you still get the benefits of nice slow-mo and freezeframes. so hopefully that sets you up in the right direction. I would use interlace is your footage is interlaced.
“In addition, all footage is being produced at a 16:9 or 2.39:1 ratio, if that affects anything.”
Your aspect ratio shouldn’t make a difference. Just make sure you make your animations on a 16:9 canvas.