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Author Topic: A bit off the beaten track  (Read 3764 times)
Jonathan Wienke
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« on: May 20, 2009, 10:31:45 AM »
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I have an older HD camcorder that unfortunately only does 1080/60i, no progressive-scan mode option. A lot of the stuff I shoot ends up being viewed on the computer at less than full resolution, and the toothcomb artifacts from the interlacing are very annoying. What I would like to do is convert the video to 60p at a lower resolution by splitting the fields into separate frames. So instead of the BS of 1920x1080 @ 30 FPS with half of the horizontal lines exposed 1/60/sec after the other half of the frame, have 1920x540 @ 60 FPS, which would then get downsampled to 854x480 or something along those lines. Is there any tool out there I could use to split the fields into separate frames like this?
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Les Sparks
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« Reply #1 on: July 20, 2009, 11:40:34 AM »
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Sorry for the late reply. Don't usually visit the video section here. Check out the discussions at HV20/30 forum. You'll find more than you want in the various discussions. Use the forum search  function.
A few sample threads that might help:
30p and 60i
deinterlace 60i
AVSynth and VDub templates
deinterlace advice
more deinterlace[/url
][url="http://www.hv20.com/showthread.php?t=218&highlight=deinterlace"]And this thread

Also check out Eugenia's Blog and specifically Interlace stuff
Search Euginea's site for more info on deinterlacing 60i.
Don't let the fact that most of this stuff refers to Canon HV20 or HV30 camcorders. The ways for dealing with interlace will work for all camcorders.
I suspect that none of the discussions I suggest will answer all  you questions, but they are are start. If you don't find what you need using the search function, then ask your question on the forum.
Good luck.
Les
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witz
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« Reply #2 on: July 20, 2009, 09:09:17 PM »
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back a few years ago when I was shooting with sony z1's, I used Nattress' conversion plug-ins and they worked great! http://www.nattress.com/ ( Graeme Nattress is a member of this forum and always helpful if approached ) I used his "film look" plug-ins as well... especially the bleach bypass... good stuff.

another quick option is to ( if your on a mac ) drag your quicktime file into itunes and then convert it to appletv spec..... that will make it deinterlaced and 960X540.

Quicktime pro also has the appletv export preset.... once exported, you can open it again and then save as a regular quicktime for the web.
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Graeme Nattress
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« Reply #3 on: July 20, 2009, 09:56:06 PM »
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Thanks Witz - FYI the plugin that does the 60i to 60p is called "G Map Frames" and comes in the Standards Conversion pack. It works well for doing 50% slowmo from the fields and can look quite nice. I think you'll get a nice result using this or other similar techniques.

Graeme
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bradleygibson
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« Reply #4 on: July 20, 2009, 10:04:34 PM »
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Quote from: Graeme Nattress
Thanks Witz - FYI the plugin that does the 60i to 60p is called "G Map Frames" and comes in the Standards Conversion pack. It works well for doing 50% slowmo from the fields and can look quite nice. I think you'll get a nice result using this or other similar techniques.

Graeme

Does anyone know if there would there be any issue with parallax (one scan line) with Jonathan's original approach?
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Jonathan Wienke
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« Reply #5 on: August 30, 2009, 04:07:47 PM »
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Let me clarify: I do not want to do standard deinterlacing, and what I'm trying to do has nothing to do with inverse telecine 60i to 24p conversion. When shooting action at high shutter speeds, deinterlacing makes each frame looks like a double exposure, and the resulting video is still only ~30 FPS. I want to convert each field into completely separate progressive frames so that instead of having 30i I have 60p with either half the original vertical resolution or else the missing lines interpolated with something along the lines of Photoshop's Bicubic resizing (to eliminate any vertical jitter from the 1-line offset of each field). Then I intend to downsample the footage to something along the lines of 853x480 resolution, so that the final video is 853x480/60p.

The G Map Frames plugin is pretty much what I'm looking for, except I'm not using FCP so I'd need a standalone equivalent. Any thoughts?
« Last Edit: August 30, 2009, 04:13:40 PM by Jonathan Wienke » Logged

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