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July 22nd, 2007, 11:28 AM
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#1 |
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Posts: n/a
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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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July 22nd, 2007, 11:33 AM
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#2 |
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Wrangler
Join Date: Dec 2002
Location: Mays Landing, NJ
Posts: 11,787
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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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July 22nd, 2007, 03:27 PM
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#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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July 22nd, 2007, 03:40 PM
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#4 |
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Wrangler
Join Date: Dec 2002
Location: Mays Landing, NJ
Posts: 11,787
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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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July 24th, 2007, 06:15 AM
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July 24th, 2007, 03:54 PM
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Tourist
Join Date: Jun 2007
Location: Sydney Australia
Posts: 2
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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 06:22 PM. Reason: Removed links to Doom Forums |
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July 25th, 2007, 06:58 PM
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July 25th, 2007, 07:18 PM
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Major Player
Join Date: Mar 2004
Location: Portland, OR
Posts: 314
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Quote:
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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July 26th, 2007, 11:07 AM
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July 27th, 2007, 06:16 AM
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#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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July 28th, 2007, 03:02 PM
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#11 |
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Major Player
Join Date: Mar 2004
Location: Portland, OR
Posts: 314
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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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July 29th, 2007, 01:05 PM
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August 3rd, 2007, 05:52 AM
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ignore this
Last edited by Guest; August 3rd, 2007 at 05:52 AM. Reason: delete |
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August 3rd, 2007, 08:41 AM
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#14 |
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ignore this too
Last edited by Guest; August 3rd, 2007 at 09:21 AM. Reason: Sod's law, it works now |
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