Slow Mo HV20 footage

[azmyth]

Ok, so we didn't intend to slow mo this footage.. but as it turns out it works alot better (even if not perfect) slowed down...

it was shot in 24p pulldown removed.. how would I go about getting a semi decent slow mo from it? I'm editing in FCP.

[Khaver]

You'll have to use a motion interpolating program or plugin to create intermediate frames. For the PC there's Twixtor or some avisynth plugins and scripts. Anyone know what's available for the Mac?

[azmyth]

yeah I found twixtor, was hoping it was for mac..

[Khaver]

If your camera was fairly stationary and only objects or actors were moving that you want to slow down, you could use a photo morphing program. Export the clip as an image sequence. Load frame 1 and 2 into the morphing program. Set the morph points around the objects/actors in each frame. Set the number of intermediate frames and render out the new frames. Do this again with frames 2 and 3, and so on till you have all the frames you need, then re-import your new sequence into FCP.

Kind of a laborious process but it should work.

[azmyth]

its a like 30 sec or so jib shot of characters walking out of a house....

[Khaver]

Can't hurt to try it. MorphX came up on google.

Are you going to use the full 30 sec.? Slow down the speed just by half and that's a 60 sec clip. Export just the frames you will use.

You can experiment with timing in FCP by time stretching the clip (FCP will probably just blend or duplicate the frames but you will be able to cut for timing and such and see what you'll need to export).

[krewcial]

I always use JES Deinterlacer. Free program and great results for 50% slowmotion.

Ok, so we didn't intend to slow mo this footage.. but as it turns out it works alot better (even if not perfect) slowed down...

it was shot in 24p pulldown removed.. how would I go about getting a semi decent slow mo from it? I'm editing in FCP.

[Khaver]

I always use JES Deinterlacer. Free program and great results for 50% slowmotion.

Won't work with the 24p footage he has. You need 60i or 50i for this to work.

[ejolson]

I can understand not wanting to buy PC software when you only own a Macintosh. If you can borrow time on a PC, you could use avisynth as described in

http://www.hv20.com/showthread.php?4...ht=slow+motion

which is at least free. Process the slow motion on a PC, render it, and import the rendered slow motion file back into FCP on your Macintosh.

[robstowell]

I have some 25p footage I'd love to slow down nicely. The de-interlacing method - giving one twice the frame-rate, at the expense of half the resolution- is the first step described, and won't apply. BUT- if the AVIsynth process involves motion interpolation, and creating intermediate frames, surely that's not necessary- and in fact would mean using frames with less resolution as a basis, which can't be a good start?
I've never used AVIsynth (and I'm not great with virtual dub!) so it's unclear to me what part of the scripts involves motion interpolation- or whether it's even possible to start with progressive footage, leaving out the de-interlacing part- or if motion interpolation can even be done with avisynth!
Has anyone done this? Comments?
Even more complex is a sort of 'speed ramp' effect. Avid and Edius both offer this ability to speed up and slow down footage, but they both, afaik, use simple frame duplication to slow footage down. Can avisynth do that too?

[Khaver]

There are plugins for Avisynth that will "create" interpolated frames. It's not so much the resolution of your video that will give you the best results but the clarity of the video. Motion interpolaters have problems when there is motion blur in the video. If you shoot with a high shutter speed you will get much better results.

You could probably do a speed ramp effect with Avisynth but it would be easier to just create your slo-mo footage with it then use that in your NLE to create the ramp effect.

[ejolson]

Avisynth can do reasonable motion interpolation using mvtools and mvtools2

http://avisynth.org.ru/mvtools/mvtools.html

If you are shooting for slow motion, the decreased resolution of 50i is preferable to the decreased motion information available in 25p. In particular, it is easier to interpolate the missing lines in a 50i field than it is to create an entirely new frame.

[Khaver]

As a side note, it can also convert true 60i to 24p with variable motion blur by creating 120fps footage then selecting 1 out of every 5 frames.

[robstowell]

Sounds good, but a bit more to learn: running avisynth in VD, then mvtools in avisynth? Doesn't sound simple! I need to read this that thread VERY carefully!
Too late to re-shoot this footage. Its got some motion blur AND isn't interlaced. On the other hand, 75 fps- or even 50- would work well, I think. It doesn't look too bad at 50 just with doubled frames, so I might stick with that.
But I will try the deinterlacing route, for sure. Sounds fairly simple. I usually master to 720p anyway, so the loss of resolution isn't too extreme. And just 50% speed can be enough for a nice effect.

[Krane]

Ok, so we didn't intend to slow mo this footage.. but as it turns out it works alot better (even if not perfect) slowed down...

it was shot in 24p pulldown removed.. how would I go about getting a semi decent slow mo from it? I'm editing in FCP.

Re-shot in 60i!