fast motion

rufsiany · 25th November 2008, 00:45

What is the a good/easiest way of creating fast motion with Avisynth? I have an 1 hour video of the office interior taken from the tripod and want to speed it up to e.g 20seconds. I can do it in VirtualDub: menu -> Video -> Frame Rate -> (Change frame rate to (fps): 10000. Convert to fps: 25). But I would rater do it entirely within avisynth script. AssumeFPS()? ChangeFPS()?, ConvertFPS()? Which one to use? The doc. is rather vague on their purposes.
Thanks
rufsiany

linyx · 25th November 2008, 00:59

Say your source is 30 fps then AssumeFPS(60) would play it at 2x speed. So a few calculations should give you what you need.

Blue_MiSfit · 25th November 2008, 02:51

Right. Then changeFPS to decimate it down to your final frame rate. (30?)

~MiSfit

linyx · 25th November 2008, 02:59

@Blue_MiSfit
Good idea. Never thought to change the framerate down again.

PeaceAnt · 29th November 2008, 20:11

selectevery(100) gives you 100x speedup

pozdrawiam

25th November 2008, 00:45	#1 \| Link
rufsiany Registered User Join Date: Nov 2008 Posts: 1	fast motion What is the a good/easiest way of creating fast motion with Avisynth? I have an 1 hour video of the office interior taken from the tripod and want to speed it up to e.g 20seconds. I can do it in VirtualDub: menu -> Video -> Frame Rate -> (Change frame rate to (fps): 10000. Convert to fps: 25). But I would rater do it entirely within avisynth script. AssumeFPS()? ChangeFPS()?, ConvertFPS()? Which one to use? The doc. is rather vague on their purposes. Thanks rufsiany Last edited by Guest; 25th November 2008 at 02:03. Reason: rule 12

25th November 2008, 02:51	#3 \| Link
Blue_MiSfit Derek Prestegard IRL Join Date: Nov 2003 Location: Los Angeles Posts: 5,963	Right. Then changeFPS to decimate it down to your final frame rate. (30?) ~MiSfit __________________ These are all my personal statements, not those of my employer :)

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25th November 2008, 00:59	#2 \| Link
linyx Un-Registered User Join Date: Mar 2008 Location: Audio Stream - 0x80 Posts: 341	Say your source is 30 fps then AssumeFPS(60) would play it at 2x speed. So a few calculations should give you what you need.

25th November 2008, 02:59	#4 \| Link
linyx Un-Registered User Join Date: Mar 2008 Location: Audio Stream - 0x80 Posts: 341	@Blue_MiSfit Good idea. Never thought to change the framerate down again.

29th November 2008, 20:11	#5 \| Link
PeaceAnt also known as GrassHoppeR Join Date: Mar 2006 Location: Poland Posts: 30	selectevery(100) gives you 100x speedup pozdrawiam