Smooth Slow Motion... is it SD? at DVinfo.net

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Sony HVR-V1 / HDR-FX7
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Old July 2nd, 2007, 02:38 PM   #1
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Smooth Slow Motion... is it SD?

I'm wondering if it's really recording SD to the HDV timeline

I filmed all weekend and got about 10 tapes, I had 40-50 shots of smooth slow motion that are moments you can't really get again and when we watched it on the TV it looked great (well it was SD!) but once I import it to my computer it looks horrible, if I scale the window down to about SD size it looks pretty good...

I'm just curious if it's recording at a lower resolution for that...

I'll post up some examples if people care...

I have an FX7 btw
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Old July 2nd, 2007, 03:05 PM   #2
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there is a feature on V1 that does slow motion but at half or quarter resolution (depends how long you record).
probably it is the same on FX7 ?
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Old July 2nd, 2007, 03:10 PM   #3
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Ah, it's locked at 6 seconds (I know the V1 does 3sec, 6, and 12... If I could do 3 sec burst and still have full resolution (even 720) I'd be happy...)

Sucks that I didn't find out about this later, I would have rather just stuck in normal HDV :(
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Old July 2nd, 2007, 03:29 PM   #4
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you still can do slomo at good res.
just use virtual dub to split your 60/sec interlaced frames to 60 progressive pic/sec. it will gives you 2x slomo at halh vertical res. (1440x540).
then you can interpolate between each picture with some software (motion perfect ?) and go slower (4x).
look here http://www.100fps.com/

or perhas it is clearer here http://dvinfo.net/conf/showthread.php?t=50375

Last edited by Giroud Francois; July 2nd, 2007 at 04:00 PM.
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Old July 2nd, 2007, 03:36 PM   #5
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There's a real good article on doing this in this months DV magazine. Not sure if it's posted on-line yet. The author claims it's like what you get from a Varicam! I haven't tried it yet.
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Old July 2nd, 2007, 04:06 PM   #6
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It's definitely half/quarter resolution (I'm thinking quarter)

I was thinking maybe it was in SD mode for slow mo recording...

I guess it makes sense, buffering 120fps for 6 seconds at 1440 x 1080 is a lot of work :P

I know how to de-interlace, if I could convert my 60i stuff to 60p I'd be happy.
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Old July 3rd, 2007, 07:50 AM   #7
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Hey check out the slow mo feature on the V1. I shot this at a 4th of July event.

http://www.youtube.com/videodojo

I captured this video in Premiere with HDV preset. When you click on properties it says the video is 1440x1080. I projected it onto a 10 foot screen and it looked great.
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Old July 3rd, 2007, 08:24 AM   #8
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It's a 480 x 270 clip enlarged to 1440 x 1080... I think... stored on the HDV timeline

I'm not positive, but I know when I scale the window down, it looks more accurate than at full 1920x1080 (1.33 pixel ratio)
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Old July 3rd, 2007, 03:32 PM   #9
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http://www.lousyheros.com/videos/xpslslo.wmv

465 x 260 is what I ended up with I think... probably the wrong resolution but it looks decent

8 minutes of slow motion :P

That's roughly the resolution you get with the FX7...
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