How to get good slow motion in Premire 5.1

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Matthew L
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Joined: Nov 18 2000

I am editing some fast skydiving footage that I would like to slow down in places. I captured the video as with my adaptec 8945 DV card and opened it in premiere as a 25fps project. When I came to do a slow mo effect I selected the clip and changed the speed to 50%. This resulted in an appalling jerky mess when previewed and rendered to tape.

How do I get a nice smooth slow-mo playback like the one that is built into my PC-7?

Many thanks in advance,

Matt

Billwill
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Joined: Sep 17 2000

I noticed that if you slow down analogue footage it does get jerky unlike the super slo-mo on sport on the telly. I'm convinced it's down to the way my consumer cam records onto tape in the first place. I'll wait with interest for a more technial analysis or remedy

Billy Ellwood is on Vimeo http://www.newcastleaca.co.uk at the film club

ddmurphy
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Joined: Mar 21 1999

Matt
I suggest you do a search of old messages on this board as I am sure that I remember one of our experts suggesting something like placing the same slowed clip on another track but offset by one frame then putting each at a transparency of 50% then rendering. The slowmotion effect is then improved. But do a search to find out for certain!

HTH

David

ddmurphy
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Joined: Mar 21 1999

quote:Originally posted by ddmurphy:
Matt
I suggest you do a search of old messages on this board as I am sure that I remember one of our experts suggesting something like placing the same slowed clip on another track but offset by one frame then putting each at a transparency of 50% then rendering. The slowmotion effect is then improved. But do a search to find out for certain! It will never be perfect however as you cannot 'create' more than the original 25fps..any slowing down must include repeat frames.

HTH

David

tom hardwick
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Joined: Apr 8 1999

Well remembered, David. I did indeed post such a tip, and have done so at least twice. Another good slo-mo trick is to output from the DV cam in slo-mo. My TRV900 does a beautifully fluid slo-mo (as long as you've locked the shutter speed at 1/50th) when output to the hungry Raptor usung the IR remote.

tom.

Matthew L
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Joined: Nov 18 2000

I get a beautiful slowmo from the PC-7, but if I try to capture it into the Adaptec AHA-8945 card I am using, it complains and crashes the PC. I just wondered if there was a way of doubling the frames (to get a speed of 50%/clip duration of 200%) and alternating the fields so it doesn't look so jerky.

How does the camera do slowmo internally?

If I could do a nice approximation of this it would at least get me going. The problem seems to be made worse by the fact that all of these scenes have been shot in sports mode on a high shutter speed; there is a very high ambient light level above the clouds where the sun always shines. Add to that the reflection from white cloud tops and the situation turns into an exposure nightmare!
I'm sorry if you guys may be repeating yourselves, but I do value the help tremendously.

Matt.

Matthew L
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Joined: Nov 18 2000

Just searched the old messages.
If the camera creates a slowmo effect by making a frame from each field (and halving the resolution), is it possible to do this exact thing in premiere 5.1 and create a 'reasonable' slowmo effect?

-I'm just trying to avoid having to fork out more cash for another card with DV and S-Video connectors...

Matt.

RichardJ
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Joined: May 7 1999

You definitely can do it in Premiere, though as I'm not a Premiere user I can't tell you exactly how. It's basically a question of telling the editor that the clips you are using contain 2 fields - you usually have the option to specify which of the two possible orders the fields are packed, and this depends on the capture card/codec.

You normally also have to specify that the output video is 2-fields/frame as well. I use MediaStudio which offers all these options, and I know Premiere does too, just not how to get at them.

You can get away with treating video as frames for a lot of editing, but as soon as you do anything involving speed changes, or playing clips backwards, then if you don't have the field settings right it's a mess. But configure it properly for fields and it wil work beautifully.

------------------
Richard Jones, http://www.activeservice.co.uk
Home of the MediaStudio Pro Tutorial

Richard Jones, http://www.activeservice.co.uk
Home of the MediaStudio Pro Tutorial - Edition 3 for MSP 7

skyfun
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Joined: Sep 16 2000

quote:Originally posted by Matthew L:
there is a very high ambient light level above the clouds where the sun always shines


But we don't jump above the clouds !!

Hi Matt don't know if this helps but I use a Pana DX 100 set on sports mode & LP.
Edit with DV 500 & Premier 5 1c
Capture format is Pinnacle AVI
Edit Pinnacle AVI DV 25fps
Clips can be slowed down ok in premier
It might be your card or system what are you useing.
John

[This message has been edited by skyfun (edited 19 December 2000).]

tom hardwick
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Joined: Apr 8 1999

If it works for you skyfun, then of course it works, but the action of putting your cam into the Sports mode ups the shutter speed per frame to give you sharper stills, and it's this "freezing" of motion blurr (of both subject and camera) that makes the resulting Premiere induced slo-mo look "sticky". Much better to stick to 1/50th (unless you want prints from the timeline of course) and use ND filters to soak up the light.

tom.

skyfun
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Joined: Sep 16 2000

Yeah Tom that's why I use sports mode I like to put a sequence of 4 sec stills on the customers tape because the dive only lasts 35 sec and it looks cool for them to see them self falling out of a plane and as we fall at over 120 mph any other setting gives blured images

John

red
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Joined: Oct 1 2000

Maybe you are asking Premiere to do a bit much by going to 50%. Try at 75%. I find that checking de-interlace in field options helps (Clip/Video/Field Options) .Sometimes checking Reverse Field Dominance (also field options)smooths out slo-mo.

red
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Joined: Oct 1 2000

Matthew, take a look at www.adobe.com/support/techdocs/104b2.htm
Solution 3 looks like it may help your problem. Cheers.

Matthew L
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Joined: Nov 18 2000

Well, I'm off to do some editing tonight, armed with a plethora of advice from all of you (and the adobe support page -but when have they ever got it right?!).

Many thanks for the help everyone 80)

Matt.

cresby
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Joined: Oct 5 2000

output clip as gif sequence of files and re-import with duration set to 2 frames. Can't remember if Premiere saves as one file or you can seperate them out.
Premiere will allow file sort so you can get reverse sequences at a click and drag.

Mr Red