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FCP 5.0.4 HD to SD downconversion moiree issues
Hey all,
We finished editing a music video that we shot on an HVX200 in 720p @ 24p with a few slow mo shots as well. We edited it in FCP 5.0.4 in a DVCPRO HD 720p 23.98fps sequence. Everything looked great and dandy at that point. We exported a DVCPRO HD 720p 23.98fps quicktime movie and re-imported that movie into a DVCPRO 50 23.98 fps sequence for output via SDI interface to a DigiBeta deck. We noticed however, that once our film was in the SD sequence, that certain shots that had tight patterns (i.e. brick walls, striped shirts, etc.) had distinct moiree patterns. We went back and looked in the HD sequence, and did not see any moiree. Is there some feature that we are overlooking to remove this problem? Is this just a characteristic of down conversion? In the future should we avoid shooting tight patterns in our shots when we know the final product is going to be output to SD?
Also, I was told that when you author a 24p DVD, that all DVD players will add 3:2 pulldown “automatically” to 23.98fps footage. So, we took the DVCPRO HD 720p 23.98fps quicktime movie of the above music video and dropped it into an iDVD project. Upon playing back the DVD in both a Panasonic and a Sony DVD player, we noticed that they were not adding 3:2 pulldown to the DVD. It had the “stuttery” no pulldown added look to it. Our tape looked fine, albeit except for the moiree.
Any help would be appreciated. Just to re-clarify, we made sure in our “system settings” menu that use 3:2 pulldown was checked. We edited in DVCPRO HD 720p 23.98fps timeline. Outputted through DVCPRO 50 23.98fps timeline via SDI to DigiBeta Deck. Took DVCPRO HD 720p 23.98 quicktime movie, dropped it into iDVD project. Moiree on the tape but everything else fine. Moiree and no pulldown on the DVD, but everything else fine. Thanks.
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3 Replies
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I discovered this too. We mastered out to D5 just fine, but then when it came to do the downconvert…BOOM…moire. Stuff I didn’t see when watching it on my HD monitor.
Why did this happen? Well, HD has more scanlines than SD, so you didn’t get this pattern. But this is something you would have seen in the camera, or on the monitor in SD because you have less scan lines, therefore there is less detail in between the bricks and blinds and anything where there are lines like that.
Solution? Add a slight vertical blur to the footage. Like 2 points. I had a LOT of line art in my last show and I will NEVER do that again.
Shane
Littlefrog Post
http://www.lfhd.net -
Thanks Shane. I thought I was going crazy. We’ll do the blur for now and attempt to not shoot patterns in the future. Any advice on the lack of pulldown on our DVD’s?
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No pulldown is added to my knowledge. 23.98 will play at 23.98. Hollywood DVDs are all 24fps.
But then again I don’t use iDVD, I use Compressor to do a High Quality DVD encode, then use DVD SP to author. My footage looks fine.
Shane
Littlefrog Post
http://www.lfhd.net
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