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does downconverting HDV to PAL lose the interlacing?
I exported an HDV sequence to a PAL quicktime and it looks like the interlacing has disappeared. my broadcast monitor no longer jitters on still frames like it does when dealing with an HDV sequence.
The interesting thing is that my Decklink HD Pro card which downconverts in realtime seems to retain the interlacing but exporting an SD quicktime seems to lose it.
Questions:
1. Is there a way to downconvert to quicktime and retain the interlacing?
2. Is the interlacing necessary anyway? I need to play this out to SD digibeta for delivery to a colour grading company. I’d rather use an SD quicktime if possible because then i can take it somewhere that has a digibeta deck (and perhaps not an HD card) than hire one to use here. -
5 Replies
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Interlacing is neccessary unless you deliberately want to de-interlace for a look. How do you know the QT is deinterlaced? Are you dropping it back into an FCP timeline and playing out the Decklink or just playing it in QT? Also I assume you are downconverting from a PAL HDV to PAL SD.
Also check the settings in QT. I am not sure, but there may be a de-interlace option during the render which you can untick.
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I just had a look and in QT Conversion, when you go to OPTIONS, in the SIZE menu there is a tick box to de-interlace. Make sure it isn’t checked
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I am exporting using the “Quicktime movie” option not the “using quicktime conversion”, where that interlacing option you mention lies. I choose the setting for uncompressed 8-bit PAL and there doesn’t seem to be any interlacing options here.
Yup it is 1080i25 HDV, so should be PAL compatible.
I believe it’s not interlaced because when viewing at 100% i can usually see the interlacing artefacts on the source clip. Also my broadcast monitor usually shows me a flickering still-frame on interlaced material, but not after the downconversion.
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The HDV timeline should be 1080 50i. Also better to make your QT as 10 bit Uncompressed 4.2.2. Digi beta is 10 bit and the extra bits do help.
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ah, yeah sorry, that’s what i meant, 1080i50. and thanks for the tip about 10-bit, i was wondering if that was neccessary.
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