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-   -   Moire with GH2 after converted (http://www.dvinfo.net/forum/panasonic-lumix-g-gf-gh-gx-series/491856-moire-gh2-after-converted.html)

Jeff Harper February 16th, 2011 03:21 PM

Moire with GH2 after converted
 
OK, made 3 minute test video of my cats, shot in 1080i. when I rendered the files in Vegas to 1080 60i avi, it was perfect. Pay particular attention to the shoestring that dangles at just over halfway. Cincinnati Video Production by Jeff Harper Video

When rendered to vanilla SD widescreeen avi, lines that occur when during pans are quite severe.

Mpeg2 widescreen for DVD, same thing, of course. I couldn't possibly put this on a DVD for a customer.

Do I have to record in SD to get acceptable quality for DVDs? I was hoping to shoot in DVD and give customers an option later on for Bluray, but at this point it looks pretty hopeless. Suggestions anyone?

David Grinnell February 16th, 2011 04:09 PM

this thread helped me :)

http://www.dvinfo.net/forum/what-hap...d-quality.html

Jim Snow February 16th, 2011 04:12 PM

Good news - sort of. The problem you describe isn't a problem with the camera; it's with your resizing / conversion. What you are seeing isn't moire, it's interlacing and resizing artifacts. I believe you are using Vegas, is that right? What settings are you using?

Jeff Harper February 16th, 2011 04:45 PM

Well for what you saw I rendered out to .avi widescreen. When I rendered to HD avi it was perfect, but I think I already said that.

Jim, I've played with it some many ways, I am not sure. I believe I used the properties of the footage for editing, then cropped the clips to 16:9, then rendered to .avi.

I did the same thing for mpeg2 for sd video 16:9 and the results were exactly the same.

Jeff Harper February 16th, 2011 04:47 PM

David, thanks. but that is a VERY long thread!

Martyn Hull February 16th, 2011 05:39 PM

What does the footage look like played direct to your HD tv via hdmi, if its ok the problem is with the edit.

Jeff Harper February 16th, 2011 08:09 PM

I had been in this coversation two years ago or so about HD to SD and I kept preaching at everyone it is better to shoot in SD if the end product was going to be SD. I had among the first FX1000, but never used it for HD. I only bought them for the 16:9 picture.

Now I actually want to shoot HD with my HD camera, and I've forgotten what little I Iearned back then. I want to shoot HD and downconvert so I can upsell BluRay discs later, and so I can have HD samples.

Anyway, I'm going to shoot 720p this evening and see if it converts any better. I don't understand the technicalites of all this, I try and learn what will work and leave the debating to everyone else and forget about it.

Or if anyone can suggest something I can do in post to make it better that would be great too. If I haven't given enough information, let me know.

David Grinnell February 16th, 2011 08:15 PM

yeah no joke!! it takes a while to filter out whats there...


-bring the video into Vegas(same settings as the footage, ie. 1080, 24p or whatever it may be)
-Render out a uncompressed AVI
-Open in Vdub
-Use the resize filter (on filter mode use Lanczos3)
-Render it out of Vdub using the Lagarith codec
-then bring it back into vegas and it works great

Thats just what I got out of that monster thread hah

David

Jeff Harper February 16th, 2011 10:55 PM

Thanks David, I'll try it. Hopefully the resulting files won't be too large, my projects tend to be about 1.5-2 hours.

Jeff Harper February 16th, 2011 11:13 PM

David, the 3 minute video rendered at default uncompressed it 33GB. an hour would be 600GB. 2 hours would be 1.2GB. I'm not a numbers guy, so I might be wrong.

Any thoughts? Wait, I'm going to render it differently to 1080 60i again, and try that, that should be smaller, more like 6gb

Jeff Harper February 16th, 2011 11:45 PM

When rendered out to 1080i avi the file is only 16GB, still quite large. I'll put into Virtual Dub and see if I can figure out how it works...thanks David.

Brian Luce February 17th, 2011 02:44 AM

I tried to consolidate some of the info in the above linked thread on HD to SD conversion. Personally I think it's just too many steps to take and too cumbersome. Maybe there's a plugin or other method?

Have you tried to film in 1080p and then downconvert?

Waldi Krasowski February 17th, 2011 03:16 AM

Nowadays I always shoot in HD. As SD can easily be downsized from HD - but not the other way back! So far did not encounter any problems with it.

Jeff Harper February 17th, 2011 07:40 AM

I'm thinking what I actually might have seen in my video was the effect of rolling shutter, magnified via conversion. It sure fits the bill.

Guy McLoughlin February 17th, 2011 09:01 AM

Jeff, the problem you are seeing is 1080 60i interlacing artifacts, not moire.

I would recommend that you either shoot in 24P progressive mode ( which will eliminate interlacing completely ) or de-interlace your video with Sony Vegas Pro, before down-rezing to SD format.


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