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Remember that, when you slow your video, you're actually adding frames. So, if you start out with a video running 30 frames per second and you run it at 50% speed, you now have a video running at only 15 frames per second. And that can start to look jittery.
You can minimize this effect by apply Frame Blend to your slow motion clips. You can get to Frame Blend by right-clicking on your clip on the timeline.
All of this is assuming that this video is captured by Premiere Elements from a miniDV camcorder. Video captured from DVDs or from camcorders using the MPEG file format, and particularly video from still cameras, can pose additional problems, do to the way they store data for individual frames.
I can understand how slowing the clip down reduces the frame rate.
The footage was captured by PE4 from a miniDV camcorder (Sony PC105) via firewire.
And the captured frame rate is 25 fps (PAL).
So when I reduce the speed by 50% the frame rate reduces to 12.5 fps
The thing I dont understand is that when I play video in slow motion from the camcorder and watch it on TV, the footage is nice and smooth.
What does the camcorder do to make the footage nice and smooth that PE4 doesnt do ?
I selected 'frame blend' but I didnt bother burning it to DVD to see how it looked on TV.
'Frame blend' made the video look too blurry.
This is just a guess, as I do not know the specs of your camera, but I would say that it uses a mechanical slow-mo, i.e. it actually advances the tape more slowly. No frame work needed. An NLE cannot access the mechanicals of the computer, or DVD player to physically slow things down, so it has to do it with frame interpolation instead. This usually works to some degree, but is not without visual problems.
I've seen some, who recommend only increasing/decreasing the speed to certain points. If more/less is needed, they do it in steps. Unfortunately, I have done neither slow/fast motion, of more than a tiny amount, so cannot direct you there.
I hope that Steve, Paul or others will have more ideas for how best to accomplish this 50% change in FPS for you.
Slow down your footage to 80% then make a dv-avi, put it back on the timeline and reduce it again to 80%. This will probably give you a better speed. You can also duplicate the slomo and put it above the original in the timeline and offset it 1 frame and lower the opacity to 50%. See what works best.