Making a Reverse Video Clip

[Squid_uk]

Hey guys!

I have a very hilarious video clip of a friend of mine sledding on holiday involving a very funny crash! What i would like to do is play the video in normal speed, then in slow motion (about half speed), then the clip to reverse play (also half speed) then play normal again.

Would this be possible to do?

Program i have are: Windows Movie Make, Sony Vegas, Sony Movie Studio Platinum and Ulead VideoStudio

[cd090580]

Avisynth can play reverse easily. Slow down is possible too I think

function changespeed(clip a, float factor, int mode, int th)
{
ord = getparity(a) ? 1 : 0
f=a.kerneldeint(order=ord, sharp=false, twoway=false, threshold=th)
e=a.separatefields.trim(1,0).weave.kerneldeint(ord er=1-ord, sharp=false, twoway=false, threshold=th)
interleave(f,e).assumeframebased
# converttoyuy2() # not needed if mode=2 saves extra conversion by commenting out

(mode == 0) ? changefps(framerate*factor) : (mode == 1) ? convertfps(framerate*factor) : converttoyv12().mvconvertfps(fps=framerate*factor) .converttoyuy2()
assumefps(a.framerate*2,true)
separatefields()
(ord==0) ? selectevery(4,0,3) : selectevery(4,1,2)
weave()

}


video=Avisource("myvideo.avi")
reverse = video.reverse()
slownormal = changespeed(4, 2, 8) #1/4 speed, using motion compensated frame interpolation (motion will stay smooth)
slowreverse = slownormal.reverse()

return video+reverse+slownormal+slowreverse

This script should give what you want

[stantheman1976]

Sony Vegas:
Right click on the clip > Insert/Remove Envelope > Velocity. You'll now see a line going through the clip horizontally. Grab it and drag it up or down. You'll see it giving you percentages. 100% is normal speed. Anything above speeds it up. 100% through 0% slowed down, 0 being almost stopped. 0 through -100% is reverse.

[Squid_uk]

stan that works well only problem is the video will only play for the same length as the audio

[guns1inger]

Just add multiple copies of the clip to the timeline and only change the velocity of one section.

[Squid_uk]

that doesnt seem to work all it does is play the first clip to a certain point then play the next clip at normal speed.

EDIT: When move the bar up or down it seems to lengthen or shorten the clip and also some if its sped up it will play the video more than once but only until the normal speed audio is finished

[guns1inger]

I don't think you fully understand how the envelopes work. If you right-click on the envelope line you can Add Points to the line. You can then vary the speed up and down at different places in the clip, or go forward and backwards in the same clip. Yes, you are limited to the length of the clip (audio), but how else do you think it will work ?

[Squid_uk]

i thought maybe you could seperate the audio and make the video clip as long as you need it to be