GH2 1080 24p. Bad, really bad, slow motion in Premiere? Suggestions?

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dcjajohnson

Member
Greatings all. Imagine my surprise to lean -- only after the fact -- that I can't use a slow motion effect in a project I've shot completely in 1080 24p. I'm looking into Twixtor, but for now, it's out of my price range.

I work in Premiere Elements (also waiting to upgrade to Premiere Pro). I've tried Frame Blend and changing field options (all of them in fact), and they all look like crud.

Was wondering if this might work for slow motion option: What if I output just the clip I want -- in full speed -- to an AVI file, then import that new AVI clip into my 24p project, and then use Time Stretch tool to 60 or 70 percent? I'll be giving this a try over the weekend. I know Premiere will ask me to convert the clip, but I'll say no. And I know I'll lose some in quality, but am thinking a smoother slow mo might be worth it? Hmmmm.

I've read tons and tons about shooting in 720 vs. 1080 and shooting 30p vs 24p, as well as 60i.

I have trouble wrapping my head around the idea of shooting a whole project in 1080 60i (or 30p, from what I understand) then working 24p in post ... all in order to have the option to use slow motion in post.

Any suggestions are welcome. I shoot with GH2 exclusively, usually in 1080 24p. Work in Premiere Elements.

Thanks!
 
If content is high motion such as sports event, 60p would give the best result as well as the best slow motion output. Not many cameras support 60p, then 60i would be an alternative. 60 frames per second will give you some what video-ish look.

60i and 30p are not the same. 60i is 60 interlaced (half) frames per second. 30p is 30 full frames per second. 30p and 24p's progressive output gives a bit of film like output.

So if you know your output will be slow motion, shoot in 60p. 24p would be difficult to make good slo-mo scene. 30p would be a good choice in general. That is my opinion only =)
 
UncleBenji1977 said:
shoot 60p or 60i like stated... http://dvfilm.com/maker/index.htm
Click to expand...

Did you mean 30p in above statement? Or truly 60p? Just checking.

And, even though I've read gobs and gobs on the difference between interlaced and progressive, and all the different frame rates. I'm still confused as to why 24p will not result in good slow mo, but 30p will. They're both progressive, right? Any guidance would be greatly appreciated!

Also, I'm pretty certain I could skip the DVfilm step because Premiere will let me output in desired frame rates (24p) if needed. Unless I'm greatly mistaken, which could be the case.

Thanks again!
 
Let me put it this way.

For slow motion, you can slow down footage to 50% of the speed. So, for 60p or 60i, after 50% slow down, it will become 30 frames per second which is what we always see in TV.

For 30p footage slow down 50% to 15 frames per second. It's stutters a little bit. 24p slow down 50% becomes 12 frames per second. Stuttering becomes obvious. 30p isn't good for slow motion either.. but it's better than 24p. It has nothing to do with interface or progressive.

So straightly for slo-mo sake, the higher the original frame rate (or called overcranking), the better the result.

Take a look at this video. it shows the slow motion from 60p and 30p footage.

Now check out this video. I poured water to myself using a Canon Powershot 100HS which can shoot at 240fps then slow down to 30fps.
 
Taky: Thanks for the responses and video examples. I'm not sure I'd dump water on myself for a test shoot, but I give you total credit for doing so!

You're a wedding videographer, right? Me too ... well, at least on my way. My overall concern is that I really love the look of 1080 @ 24p. Simply love it. I don't really want to use slow mo, but will rely upon it when I've got problems or gaps in my footage and want to fill in moments, or for a dreamy feel. But really, I hardly use it at all. That's why I'm struggling with changing my shooting setup -- say to 1080 60i -- just "in case" I need a few seconds of slowmo to help finish out a project.

I guess I'll have to shoot a project completely in 1080 60i or 1080 30p.

Can I ask what you shoot in?
 
Actually it's quite fun to pour water to yourself. After I posted the video on my facebook wall, you have no idea how many friends would volunteer to do that job too =)

I'm not sure using slo-mo to fill gap is a good idea. You can always shoot some cutaways such as audience looking still, decorations stuff like that.

1080i60 would not be a good choice as it will be perceived as home video-ish like. I always shoot 1080p30 as it gives me the progressive look but also the opportunity to slow down 50%. Recently, I switched to all 1080p24. just to try it out.
 
Search this forum; this has been discussed before. I have done 24p slowmo using free video programs virtualdub with others and it has been posted earlier in a thread... Al
 
Another tip. Adjust your shutter for your target fps. So if your shooting 24p @1/50, and want to slow-mo x 4, I would suggest a shutter between 1/100-1/200. This will certainly give you more detail, as your not trying to duplicate motion blur with a 1/50 shutter.
 
I try to always shoot the photo session and some clips of everyone getting ready to intercut into the walk in. It keeps it much more interesting than just lots and lots of slow walking.
 
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