Comments

jetdv wrote on 3/16/2008, 12:24 PM
Vol 1 #9 of my newsletters talks about how to change the speed of clips.
MUTTLEY wrote on 3/16/2008, 12:34 PM

Haven't tried this yet but saw some videos that were done using the posted technique and they were pretty impressive:

http://www.hv20.com/showthread.php?t=7759

And here's one of the vids:

http://www.vimeo.com/756506

I'm guessing in theory with the EX1 and 1080P one could skip the AviSynth step?

- Ray
Some of my stuff on Vimeo
www.undergroundplanet.com
Spot|DSE wrote on 3/16/2008, 1:25 PM
if you don't have a lot of time, and just need "pretty good" slow motion:
Shoot high shutterspeed (1/120 or higher, we use 1/250 for most segments).
Open a Vegas 1080p60 project.
CTRL+Drag to double length, or right click the file and set to .500 in the properties.
Render to a 1080p30 or 1080i60 format if you'll be staying HD, or downconvert at this point, to a DV file.
There are other/better ways to expand time, but this is fast, and produces exceptionally acceptable results considering amount of time spent in creating it.
DJPadre wrote on 3/16/2008, 9:26 PM
Should point out that all thee methods use Interlaced as a source.
For progresisve, you can forget getting anything smooth... it aint gonna happen....
Spot|DSE wrote on 3/16/2008, 9:31 PM
unless of course, you can shoot 60p, in which case you can get a very good slo-mo from it.
DJPadre wrote on 3/17/2008, 4:20 AM
or that.. my bad. i was speciically refering to 24/25p
Ros wrote on 3/17/2008, 3:26 PM
So if I am using my Sony EX1, I either shoot at 60i or 60p (720mode) in order to get nice slow motion and avoid 24p or 30p, but isn't that a Vegas issue, some of the other NLE can handle 24p or 30p for slow motion?

I know the EX1 has a quick and slow motion mode, but if I am uncertain about a shot that I might use for slow motion, what would be best, shoot it in slow motion from within the EX1 mode and speed it up in Vegas if don't want it in slow motion or shoot it in normal mode and slow it down afterwards if I have to?

Thanks,

Rob

Spot|DSE wrote on 3/17/2008, 3:29 PM
I'd shoot at 720 p 60 if you can. Vegas manages both 24, 25, and 30p for slow motion. The problem with those framerates isn't Vegas, it's the framerate. Slower framerates aren't your friend when it comes to time expansion, you want framerates as high as possible, same goes for shutterspeeds so you're cramming lots of information into those frames.
DJPadre wrote on 3/17/2008, 8:57 PM
"Vegas manages both 24, 25, and 30p for slow motion. "

It may well 'manage' the material, but as to say the problem ISNT vegas, i beg to differ.

Slow down 24p to 50% or and you will notice frame doubling, as opposed to interpolation.
Render the slowmo footage and insert back into the timeline, then hit your right arrow key to move frame by frame, and you will clearly see doubled frames, with the second frame (the newly duplicated one) slightly softer than the initial principle frame.

This applies to ANY slower percentile you might shift progressive to, and to be honest, i find it unnacceptable that after so many years, Vegas still cannot interpolate a frame properly

Throw this same material into dynapel slowmotion, twixtor, premiere CS, edius, liquid, and you will notice a smooth interpolation between extended frame
johnmeyer wrote on 3/18/2008, 12:08 AM
Slow down 24p to 50% or and you will notice frame doubling, as opposed to interpolation.A few things about Vegas slo-mo that may or may not apply to how you are using it:

1. "Smart resample" usually figures out whether to generate intermediate frames. If you are not seeing any, then you should change this to "Force Resample." This property is set for each event.

2. If you don't have the preview quality set to "Best," you will not see the interpolated frames.

3. Slow motion in Vegas is done with a simple blend of adjacent frames. If you go to 50%, for instance, then Vegas adds a new frame between each existing frame, and it generates that frame simply by doing what amounts to a fade, overlapping the two frames and assigning the appropriate strength to each, in this example, 50% of each would be used. By contrast, Twixtor, Motionperfect, the various AVISynth techniques using MVTools and other similar plugins, all use motion estimation. This technique, when it works, gives really great results. The problem is that when it doesn't work, it looks absolutely AWFUL. The Vegas approach always looks reasonably good, and never breaks down.

Try doing a slow motion pan across a picket fence and then feed that to any of the programs I just mentioned, and you will stuff that Salvador Dali would have loved. Really bizzare stuff.


DJPadre wrote on 3/18/2008, 12:27 AM
ive tried everything JM, and vegas and progressive slowmo jsut doesnt cut it im afarid.
Understandably, motion estimation can flake out and ive seen it flake somethign fierce, but fo teh majority of work, it works relly well.
As for the 'blend" between frames fora 50% slowdwon. I hav to disagree.. i am yet to see Vegas do this for progressive as all my tests and results show exact frame doubling then a jump to the next frame