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Take 2…SPEEDING UP 25 to 30 causes judder … why?
Hi
please ignore my previous post as i was in error….sorry 🙂
when i take 25 fps footage (PAL DV 16×9) and speed it up 119.88 percent, which would result in 30 fps, i get a peculiar motion judder once a second. Its like it doubles up a field. Any panning motion appears to hop back in time a frame, or stop for a frame.
Shouldnt speeding up the footage to match my timelines frame rate result in smooth motion?
i got the number 119.88 off an avid website. Should i use a different value?
thanx again, and sorry about the confusion
“I like video because its so fast!”
Bob Flood
Greer & Associates, Inc. -
5 Replies
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Do you have frame blending checked? That could be it.
Also, why don’t you duplicate the movie and open the duplicate in cinema tools then conform to 29.97 (or 30.0 if that’s really what you need).
Jeremy
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Bob,
Everything I said before actually applies…
Getting 25 frames to play within the same time as 30 means that somehow you need to create 5 additional frames. Its how you create those five frames that makes the difference. You can chuck in five random duplicates, or you can figure out a way to elegantly blend separate fields, sort of “tweening” those extra frames. Graeme’s filter does the later.
David
David Roth Weiss
Director/Editor
David Weiss Productions, Inc.
Los AngelesPOST-PRODUCTION WITHOUT THE USUAL INSANITY™
A forum host of Creative COW’s Business & Marketing, and Indie Film & Documentary forums.
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DRW
thanx for the reply!
I understand what you are saying (or, as we used to say when we were younger, i dig it, man!)
If i want 1 second of PAL video @ 25 fps to occupy 1 second of NTSC time @ 30 fps, i need to derive those 5 additional frames, and mr nattress has indeed done a stellar job of making this happenhowever
If I dont care whether 1 second of PAL video occupys 1 sec of NTSC time, and i speed it up so that what was once 25 fps is now 30 fps, (and the magic number is somwhere around 120 percent ) then i SHOULD be getting a one to one correspondence between source frames and target frames. But i dont! i am getting some odd extra field that makes the footage look like its stuttering at half second intervals. ANd thats what i do not understand, and its not fun.
I am gonna try jeremy g suggestion of cinema tools to see waht it can do
if you or anyone has any thoughts on my perdicament, please lemme know
and thanx again
“I like video because its so fast!”
Bob Flood
Greer & Associates, Inc. -
DOOOOD!!!!
it worked! thanx!
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Yeah, since you don’t need the timing to be accurate like David’s method suggests, this is the best way.
Nice and clean.
Jeremy
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