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-   -   Another 1080i deinterlace slowmo... (https://www.dvinfo.net/forum/canon-xl-h-series-hdv-camcorders/88886-another-1080i-deinterlace-slowmo.html)

Barlow Elton March 13th, 2007 11:44 PM

Another 1080i deinterlace slowmo...
 
Here's another HDV 1080i clip shot for slowmo. Turned out really nice.

Used the Nattress Fields to Frames plug-in again.

http://media.dvinfo.net/xlh1/Elton/G...SlowMo16x9.mov Right click/save. 121 MB QT.

I'll take it down after a few days to not use up Chris's bandwidth anymore than necessary.

Jay Rodriguez March 14th, 2007 06:51 AM

wow barlow, that looks really freakin good. what shutter speed was it? also, did you pull focus on them as they ran closer to you?

Barlow Elton March 14th, 2007 09:30 AM

Quote:

Originally Posted by Jay Rodriguez (Post 641467)
wow barlow, that looks really freakin good. what shutter speed was it? also, did you pull focus on them as they ran closer to you?

Thanks Jay. Standard 1/120 shutter (for natural 180 degree emulation when converted to 24fps playback) and yes, on the second shot I did eyeball focus and adjust slightly. That was a really long focal length shot (handheld w/OIS enabled) and the DOF was fairly shallow, so I had to pull focus.

The subjects go a little soft here and there but it was interesting how the shots turned out.

Chris Hurd March 14th, 2007 09:41 AM

Quote:

Originally Posted by Barlow Elton (Post 641363)
I'll take it down after a few days to not use up Chris's bandwidth anymore than necessary.

Nah, don't worry about that Barlow. It's no biggie. Sure appreciate you sharing your clips with us.

Barlow Elton March 14th, 2007 11:02 AM

Thanks Chris, I appreciate the generosity. :)

Ken Diewert March 15th, 2007 02:44 PM

Very Cool Barlow,

I just wish you were a PC guy. We need some techno dudes like you on our side.

Barlow Elton March 15th, 2007 04:55 PM

I'll see if I can dig up some info, but one thing I know is that there are a number of shareware/freebie deinterlacing programs for Windows that I'm told are quite good.

Vegas is supposed to be really good with deinterlacing, but in general, the trick for me is to deinterlace and uprez in an uncompressed codec, and then re-integrate in a 24p timeline. I'm really picky about recompression and avoid it as much as I can with the HDV format. I'm pretty sure I could get the same results in other NLE's.

Tony Tibbetts March 15th, 2007 05:49 PM

Hi Barlow,

I have an XH-A1 and Final cut pro. I was curious, what is the step by step recipe you use to achieve that slo-mo?

Jim Miller March 16th, 2007 07:58 AM

very nice footage indeed. You have a steady hand. I know OIS can only do so much.

Kevin Martorana March 16th, 2007 09:02 AM

Barlow, quick question

Would it help to shoot 1080i with the 30f option...? Have more frames for the slo mo....?

When we shoot SD..using our Panasonic SDX900...I'll shoot 30p instead of 24p..then do the slo mo because having the additional 6 frames helps smooth out the image. Now...that's "P"...not "F".

Ultimately the slomo helps to keep the "filmic" quality....

Also...why specifically a 1/120th shutter? What's the math behind that?

Thoughts ? THANKS !

Barlow Elton March 17th, 2007 03:46 PM

Tony--I had a step by step posted some time ago. I don't have the time right now to explain it but it essentially came down to this:

1--Shoot 1080i for slowmo. Fast shutter speeds like 1/120 look better

2--Capture in FCP and put 1080i clips on a 1080 60p (59.94 fps timebase) timeline.

3--Deinterlace the fields into their own standalone frames. 60i=60 fps if you extract the fields properly. I use a Nattress plug-in called Standards Conversion which has a nice feature called "Map Frames/Fields to Frames" which renders quickly and gives good results.

4--Conform the deinterlaced 60 fps clip's playback speed from 59.94 to 23.98. Use Cinema Tools or Nattress to do this.

5--Integrate into a 24p timeline. Deinterlaced clips usually look best downrezzed to 720p or SD. I've gotten away with using them in 1080p timelines however.

Barlow Elton March 17th, 2007 03:52 PM

Jim--Thanks :)

Quote:

Originally Posted by Kevin Martorana (Post 642693)
Barlow, quick question

Would it help to shoot 1080i with the 30f option...? Have more frames for the slo mo....?

Yes, but I get smoother slower results from deinterlaced 1080i. Think of 1080i HDV as 1440x540 at 60 fps. If you extract the fields properly you get a lot more temporal information that can be worked with. I've even shot raw HD SDI to full frame codecs like Sheer at 1920 x 1080 which gave me even better results than HDV given that I had even more horizontal resolution to play with. But don't worry, HDV can look great as you can see with the posted clip.

Quote:

When we shoot SD..using our Panasonic SDX900...I'll shoot 30p instead of 24p..then do the slo mo because having the additional 6 frames helps smooth out the image. Now...that's "P"...not "F".

Ultimately the slomo helps to keep the "filmic" quality....
Makes sense, but getting 30 F to look like 60p overcrank to 24p is harder to pull off.

Quote:

Also...why specifically a 1/120th shutter? What's the math behind that?
It emulates shooting 60fps for 24 fps playback with a 1/48 shutter feel to the motion blur. It's because 1/120 is equivalent to a 180 degree shutter angle for 60 fps.

HTH,

B

Tony Tibbetts March 17th, 2007 05:14 PM

Thanks Barlow. I think I can figure it out with those instructions.


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