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Old January 9th, 2006, 09:33 PM   #1
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HOW TO: 60i to 60p for slow motion???

Ok...Say for instance, I shoot a Canon XL-H1 in 60i mode. Regular ole' run of the mill 60i interlaced HDV footage.

Say for instance, I set the cameras shutter speed to something nice and high... like 1/1000.

OK...now say I want to slow that footage up for some cool slow motion stuff. Well, in Vegas for instance, I know I can either change the percentage(%) of the clip to 50% or so, or alternatively I can use the velocity envelope and slow it down that way.

BUT CHECK THIS OUT.......I have heard that since 60i is a total of 60 interlaced "FIELDS" that I can seperate those fields and convert that footage into 60p (but at 1/2 the resolution)....... is that right?

Please tell me... WHAT it the process to do that? How do I change 29.97 60i footage to 59.98 60p (1/2 res) footage?

- ShannonRawls.com
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Old January 9th, 2006, 10:10 PM   #2
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Interesting thought. Aside from incorporating 60i into a 60p project, why would doing this create any special slow motion? Wait, I take that back as I just remembered that NTSC is 60 fields a sec. Essentially 60p 240 lines res. Some slow motion VTRs of yesteryear would play one field at a time and line double the low res picture. But this was when TV sets barely had a resolution above 300 lines. Interpolated 240p might not look very good these days.

What happens in Vegas if you import 60i into a 60p project?
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Old January 10th, 2006, 09:38 AM   #3
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As far as I'm aware, if you specify a 50% frame rate in Vegas, as you describe, it will deinterlace the fields into frames just like you want it to!

I dont use Vegas, but it works that way in Premiere and AfterFX, and I've also done it using Virtualdub and via an avisyth script.

Someone else may be able to recommend the best-quality way - AfterFX would probably be high on the list.
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Old January 10th, 2006, 09:41 AM   #4
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By the way, some guy in the Sony FX1/Z1 forum posted a .wmv music video he did for an indie band a few months ago using exactly this effect ...
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Old January 10th, 2006, 09:58 AM   #5
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Shannon,

Vegas should do a fine job at 50% exactly. It won't simply field double, it will do some blending/interpolating, so you won't lose a full half of the resolution, but something in between depending on the motion in your footage.

The real way to go is Twixtor/FieldsKit, which will give you a lot more flexibility, and do high quality slow-mo beyond just 50%. It does intelligent motion tracking to interpolate the slow-mos.

Josh
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Old January 11th, 2006, 07:28 AM   #6
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Hiya Shannon,

If it's actual 60p video you're looking for, to keep that "reality" look and make 60p 1280x720p or SD 60p, the procedure is trivial in After Effects.

- make a 1440x1080 (PA 1.33) composition with a framerate of 59.94
- select your 1080i clip and check that the interpretations rules are "Upper Field First" with "Preserve Edges" checked.
- plop clip in composition... and voila! Every field becomes a frame.

Now when you render the footage you have to render it to a 60p file.

Alternatively, if you want to do slow motion (at say, 23.976 fps):
- change the composition frame rate to 23.976
- use the same interpretation rules as above
- plop clip in composition
- with the clip layer selected, click on the "Layer" drop down menu and select "Time Stretch"
- insert a value of 250% and tada! Beautiful slow motion.

-Steve
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Old January 11th, 2006, 08:31 AM   #7
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THANK YOU CHRIS!

That's exactly what I was looking for. The answer is in After Effects, Not Vegas. THANKS BRO!!! I appreciate that.

- ShannonRawls.com
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Old January 11th, 2006, 08:41 AM   #8
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Hey!

Who's this Chris guy?! ; )

-Steve
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