720/60p aliasing help

renegadewill

renegadewill

Well-known member
So I shot some 720/60p footage for an upcoming music video and I seem to be finding more aliasing that I ever have. I shot with cinestyle and -4 sharpness etc. (the technicolor specified settings). I also shot iso 2500, and I expected the noise, I am totally fine with that, but the aliasing is driving me nuts.

Clients can't see it, but we all can.

Is it due to the 720p, because 1080p for me, at least never has this much aliasing.

Got any pointers.

Skip to 0:42 and on the parking lines it is really apparent.

http://www.youtube.com/watch?v=YmDQUdkvuvY

Thanks,
Will
 
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to add enough blur to fix that degree of aliasing, you'll be doing a LOT of masking.

canon cameras are absolutely useless in 720.
 
wgzn said:
to add enough blur to fix that degree of aliasing, you'll be doing a LOT of masking.

canon cameras are absolutely useless in 720.
Click to expand...


THAT is your opinion. While 720p 60fps causes more problems, there are many many ways to get around this. lenses, focus, your settings, shooting at different angles, etc. Honestly to the op it looks really bad and I think that shot might be done for, but if you had an external monitor or were truly paying attention to your screen you would have noticed this. Your best bet is to go to that parking lot and record it & try to mask it in with this shot. Such a wide shot with high iso and at 720p 60fps you were simply asking for problems....
 
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This was shot at 720/60P on a Canon 7D. So, no, 720 on a Canon is not useless.


Classic manual focus Nikkor primes were used in the above footage, so selective focus was the aliasing-aversion technique.

Some time back there was a free plug-in developed for Final Cut Pro that was designed to remove or reduce the appearance of aliasing. It was never available for any other NLE, and shortly after it was announced I never heard anything of it ever again.

Some general discussions suggest "chroma blur" as a method of reducing the appearance of aliasing -- but I've yet to figure out exactly how to implement that in Premiere Pro.

Depending on your post capabilities, you can always add a blurred layer, reduce opacity to around 30%, and mask and/or feather and/or track and/or matte as appropriate.

The winning technique is to recognize it while shooting and avoid it with selective focus. Obviously, that isn't going to help you with your existing footage.

I've never understood why anyone hasn't developed a plug-in for the leading NLEs that reduces the appearance of moire/alising. Any developer stands to make a few hundred thousand from such a product -- even if it's mediocre.
 
I'm not totally stressed out by the aliasing, because I have even seen bad 35mm film to video transfers that have aliasing. My dvx100b had aliasing sometimes as well.

I have seen tests with the AF-100 and it gets pretty close to eliminating it, atleast from some of the philip bloom tests.

Dslrs are a great cheap tool, so how much more can you really want.
 
Rent a GH2/buy a hacked GH2. IMHO, it's the best "DSLR"-ish camera when it comes to 720p on the market right now. With hack, 720p is better than Panasonic AF100.

I shoot 720p50 with enabled B-frames at around 44Mbit with it and it's really really good. GH2 aliasing gets even less noticeable when shooting 720p as there are even more pixels to average, unlike my 550D where it's more pronounced in 720p than 1080p.

This is a uncompressed frame grab from GH2 720p50 with B-frame:

http://www.luminasweden.com/vlcsnap-2011-07-24-22h44m57s135.png
 
my opinion: I find the 720p mode in my 550D nearly useless
I only use it for very very shallow DoF shots, or if I absolutely need it
 
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