On 07 Jan, 2011, at 11:53 AM, Steve Hullfish wrote:
> I think that's a resizing issue, not an interlace issue. Look for controls that crop off those extra lines instead of trying to mathematically resize 486 to 480.
And be careful to crop by even numbers (like 2 Top / 4 Bottom) and not odd (3 Top / 3 Bottom) unless your intent is to reverse field order. Sadly, I've seen presets supplied with supposedly professional encoding apps that do the latter.
I think in this case you'll actually have the best luck with Compressor(3), as it tends to sort through the resizing / cropping maths fairly well.
Also remember that if you're knocking our some SD DVDs of 23.98 material (1080 or Red2k or the like) you don't have to waste your bit budget on stretching it out to 27.97. Let the DVD player do that part (they all do it automatically) and just worry about the native 23.98.
Depending on your setup / tools / workflow, it's sometimes best to do an HD to SD intermediate file first, then send that through the final MPEG-2 / AC3 compression. Episode, for example, can do some pretty nice 480i MPEG-2, but it seems to do better when fed a 486 or 480 source (as opposed to a 1080 or 720). ProCoder does incredible NTSC to PAL, Squeeze does... well... Squeeze pretty much just squeezes.
NB: everything above assumes NTSC.
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