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Old July 22nd, 2007, 12:28 PM   #1
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Achieving true half-speed slow mo through HD-SD conversion

I've been pondering, is it possible to shoot footage in 1080i, then deinterlace to have two separate 540-lined fields, which can then be converted to SD progressive frames, thus creating half-speed motion but in SD?

The only problem I foresee here is that 540 lines is NTSC and I need PAL...
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Old July 22nd, 2007, 12:33 PM   #2
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Hi Jonny and welcome to DVinfo! I guess it depends on your software, but suspect you'll get something very close to what you describe by slowing down your 1080i footage 50% in your NLE, then downconverting the results to standard definition.
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Old July 22nd, 2007, 04:27 PM   #3
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So it'll definitely render each field as one progressive frame?

I'll be using Sony Vegas no doubt, if I were ever to edit any HD (initially)... would it work in this?

Thanks :)
Jonny
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Old July 22nd, 2007, 04:40 PM   #4
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Jonny: I've moved your thread to our Vegas forum since that's a better place to get an answer. I'm on the Mac myself...
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Old July 24th, 2007, 07:15 AM   #5
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Jonny: I've moved your thread to our Vegas forum since that's a better place to get an answer. I'm on the Mac myself...
okay, thanks
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Old July 24th, 2007, 04:54 PM   #6
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Super Smooth Slow Motion

A more general slow motion can be achieved using some functions in AVISynth, MVTools. This uses motion compensation techniques to create the frames required.



I have slowed down surfing and snowboarding by a factor of 10 with good results for SD video. I generally convert interlaced to progressive. I have yet to try it on footage from my new HD video camera, but AVISynth should will handle that.

Last edited by Douglas Spotted Eagle; July 24th, 2007 at 07:22 PM. Reason: Removed links to Doom Forums
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Old July 25th, 2007, 07:58 PM   #7
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Originally Posted by Peter Vann View Post
A more general slow motion can be achieved using some functions in AVISynth, MVTools. This uses motion compensation techniques to create the frames required.



I have slowed down surfing and snowboarding by a factor of 10 with good results for SD video. I generally convert interlaced to progressive. I have yet to try it on footage from my new HD video camera, but AVISynth should will handle that.
So does AVISynth do that, take each field from an HD frame and convert them into individual SD progressive frames?
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Old July 25th, 2007, 08:18 PM   #8
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Originally Posted by Jonny Brady View Post
So does AVISynth do that, take each field from an HD frame and convert them into individual SD progressive frames?
You can create 60P in Vegas converting each field to a frame:

1) Download and install Mike Crash Smart Deinterlace filter: http://www.mikecrash.com/modules.php...p=getit&lid=51

(All his filters: http://www.mikecrash.com/modules.php...p=getit&lid=53 )

2) Create a 60P (59.940) project
- Field Order: None (progressive scan)
- Deinterlace method: None

3) Switches
- Smart Resample

4) Apply the Mike Crash Smart Deinterlace filter to the track

5) Render as 60P
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Old July 26th, 2007, 12:07 PM   #9
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Originally Posted by John McManimie View Post
You can create 60P in Vegas converting each field to a frame:

1) Download and install Mike Crash Smart Deinterlace filter: http://www.mikecrash.com/modules.php...p=getit&lid=51

(All his filters: http://www.mikecrash.com/modules.php...p=getit&lid=53 )

2) Create a 60P (59.940) project
- Field Order: None (progressive scan)
- Deinterlace method: None

3) Switches
- Smart Resample

4) Apply the Mike Crash Smart Deinterlace filter to the track

5) Render as 60P
Thanks very much :D
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Old July 27th, 2007, 07:16 AM   #10
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Oh just another thought on that - you say 60P, so I'm assuming you're working in NTSC - I'm working with PAL, will there be any conflict in the fact that the resolution will be 540 lines as opposed to 576?
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Old July 28th, 2007, 04:02 PM   #11
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Just create and render a "50.000 (Double Pal)" project (aka 50P) instead. I don't think you'll notice the difference in resolution. By the way, if you know ahead of time that your intended target is slow-motion 50P, you might try to shooting with a shutter speed like 1/100 rather than 1/50.
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Old July 29th, 2007, 02:05 PM   #12
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Originally Posted by John McManimie View Post
Just create and render a "50.000 (Double Pal)" project (aka 50P) instead. I don't think you'll notice the difference in resolution. By the way, if you know ahead of time that your intended target is slow-motion 50P, you might try to shooting with a shutter speed like 1/100 rather than 1/50.
Ahh nice one, good point. Cheers for reminding me. :)
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Old August 3rd, 2007, 06:52 AM   #13
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ignore this

Last edited by Guest; August 3rd, 2007 at 06:52 AM. Reason: delete
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Old August 3rd, 2007, 09:41 AM   #14
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ignore this too

Last edited by Guest; August 3rd, 2007 at 10:21 AM. Reason: Sod's law, it works now
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