TimeWarp Delema
by Zvi_Twersky
on
Mar 24, 2007 at 9:52:27 pm
I'm trying to use the Timewarp and have a problem.
This is what I want to do (simple):
1. Add Timewarp to a 1 minute clip.
2. Keyframe begining at speed of %100 until second 4.
3. from second 4 until 6, keyframe speed at 10.
4. At second six, keyframe back to speed %100.
So all I'm doing is giving 2 seconds of slow motion. Sounds simple.
Problem is, when my time indicater is on second 4, as soon as I apply a keyframe and reduce the speed, the frame in the monitor changes. The video jumps place.
Also, it seems that the entire video is cliped at the end, and I can't even strech it out anymore.
I'm not sure what's going on, but I can't get this simple act of timewarp to work the way I described above. I can't get the slow motion to apply to the place and time in my video that I want it.
Re: TimeWarp Delema by wuzelwazel on Mar 24, 2007 at 10:27:10 pm
Time Warp is an effect, and as such cannot change the duration of your footage. Also, it sounds like you're placing one keyframe at the beginning at 100%, another at 4 seconds at 10% and another at 6 seconds at 100%. Keyframes don't work this way though, what you're effectively doing is reducing the speed that the clip plays at from 100% to 10% from second 0 to second 4, then increasing it from 10% to 100% from second 4 to second 6. If you want the clip to play at 100% from second 0 to second 4 you need a 100% keyframe at second 0 AND second 4, then a 10% keyframe shortly after second 4 (depending on how fast you want it to slow down), another 10% keyframe at second 6, then another 100% keyframe shortly after that (a total of 5 keyframes). Alternatively, if you want the footage to immediately change speed at the keyframe, use hold keyframes (right click the keyframes and select toggle hold keyframe). If that's your goal though, I would recommend using Time Remap:
Time Remap will create keyframes that correspond to your footage's timecode, it is not an effect and extends the duration of your footage to the length of the composition. You would want to leave the default keyframes where they are when you do this, then add a keyframe at 4 seconds and one at 4 seconds 6 frames (if you want to stretch that .2 seconds into 2, which would be 10% normal speed). Then select the keyframe at 4 seconds 6 frames and the one at the end of the Time Remap and move them both 1 second 24 frames later (stretching that .2 seconds into 2 seconds). Make sure you turn frame blending on for your footage to try and make it look... less bad =)
Re: TimeWarp Delema by Zvi_Twersky on Mar 24, 2007 at 11:41:56 pm
First, thank you for the reply. I'm sorry I didn't explain myself, and made you write so much about the keyframes, which actually I DID do the correct keyframes... (not the hold, but a total of 5).
About the Time Remap, I knew about that too but the timewarp is suppost to be able to reduce the speed to even at a speed of 5 - giving it a super quality slow speed motion. I saw a demo clip once made with a third party plugin for premiere pro, and was told that the timewarp in AE can do the same.
The problem with exreme slow motion without a plugin in premiere is, if you reduce the speed to under %30, the picture starts to stutter... becomes jumpy, because it's just duplicating frames and of course it can't recreate inforamtion that doesn't exist.
I'm not sure how the timewarp is supposed to work, but seeing it on this demo clip, shows slow motion at speeds of 3 - 7 and it's VERY smooth and VERY slow, which gives the slow motion an effect like it was shot with a proffesional highspeed camera, like they use to shoot sports, and then slowed down.
This is the effect I was trying to get from the timewarp. I don't think Time Remap can produce this kind of quality slow motion.
Re: TimeWarp Delema by wuzelwazel on Mar 25, 2007 at 12:15:49 am
[Zvi_Twersky]"This is the effect I was trying to get from the timewarp. I don't think Time Remap can produce this kind of quality slow motion."
I tried duplicating your problem with timewarp, and with the 5 keyframes set up properly I couldn't duplicate your problem: it worked exactly the way you wanted it to. I'm not sure if there's something else I don't know about your circumstances?
About Timewarp vs. Time Remap:
I haven't messed with Timewarp enough to know for sure but from looking at the effects settings I'm betting the reason it gives such good results is a combined factor of A) Method: Pixel Motion (this is probably the same thing as enabling Pixel Motion frame blending for a time remapped layer) and B) More advanced vector calculations to come up with better results for the Pixel Motion... B is probably what gives it an edge over Time Remap.
I don't know the inner workings of the effect, however I can tell you that after some preliminary attempts with Timewarp I did have better results with super-slow motion than I did with Time Remap and Pixel Motion Frame Blending, but on a very 'active' scene (this was a headbanger throwing their hair around) the results were still unsatisfactory and not that much improved over the Time Remap.
Re: TimeWarp Delema by Zvi_Twersky on Mar 25, 2007 at 12:39:54 am
I'll explain what I did, but first... here's a problem with Time Remap:
If I try to slow down a part in the graph... it has to "make up" for that by speeding up the following frames! How do you get around that? You can't take the graph down again, because then the video will go backwards. It's like a double time line... both indicate the time.
Let me give some frames lables so I can refer to them.
The above clip durration is 0:00:11:02
Lets call the first frame of this clip FRAME AA.
If you jump to 0:00:05:15, you see the girl walking. Let's call this frame FRAME BB. The last frame of this clip (0:00:11:02) you see two men. Let's call this frame FRAME CC.
I put this scene in the timeframe. When I apply the Timewarp with just the default setting of %50 (no other changes) the entire clip is now still 0:00:11:02, but NOW if you go to the LAST frame of this clip in the timeline, (0:00:11:02) you don't see FRAME CC (the two men), but you see FRAME BB! (The girl walking). This SHOULD be ok, considering that the speed was reduced %50, but the problem is, the rest of the clip got CUT and I SHOULD be able to drag and stretch the clip so I can see it until the end, but it's not letting me stretch the clip! So everything past FRAME BB is lost.
Re: TimeWarp Delema by wuzelwazel on Mar 25, 2007 at 12:52:58 am
I don't have Windows Media Player, so I couldn't use your clip. But I tested this with another clip and it seemed to work:
Time Remap your layer but don't change the keyframes. This should allow you to extend your footage in time without adding any actual time remapping. Now use Timewarp. Best of both worlds.
Re: TimeWarp Delema by Zvi_Twersky on Mar 25, 2007 at 1:30:55 am
ok, we're getting somewhere... :-)
Combinding them both allowed me to stretch the clip like you said. Now I'm just playing around with the motion blur and stuff because the part that I reduced its speed to 7... (with timewarp keyframes) what happens is it plays VERY nice quality slow speed but evey 10 frames or so it pauses (frezzes for a few frames.) I guess its trying to make up for the time with pauses which of course is no good.
It's 3:26 AM here, so I'm going to sleep. I'll work on it tomorrow.
It's a GREAT LITTLE free player that will play ANYTHING without downloading any codecs. It's compatable with almost evey OS including MAC, LINUX, etc... You can watch the clip with it. It's worth it just to see the slow motion quality in it.
Re: TimeWarp Delema by wuzelwazel on Mar 25, 2007 at 2:53:08 am
[Zvi_Twersky]"It's a GREAT LITTLE free player that will play ANYTHING without downloading any codecs. It's compatable with almost evey OS including MAC, LINUX, etc... You can watch the clip with it. It's worth it just to see the slow motion quality in it."
I actually do have VLC, and I love it =) The WMV opened VLC but no video window appeared, I was in a rush to leave work so I didn't try to troubleshoot or download Windows Media =) Thanks for the advice though!
Re: TimeWarp Delema by novelt on Oct 14, 2007 at 7:12:55 pm
i know this is late, but i'm the one who created that clip. i did not use after effects or any other 'ion" program nor did i usea high speed camera. i used a program called winmorph - which is free - and created "morphed" frames.
doing so you can create varying speeds of slow motion. for instance you need a 50% speed. for a 4 second clip it would now be 8 seconds. so you take 4 seconds worth of frames which at 24fps would be 96 frames. then in winmorph you create 1 frame in between the frames. so it would be frame A, morph a/b, frame B and so on giving you 192 frames. then create your clip from those frames.
the clip referenced here scene22fx. i put several morphed frames in between the actual shot frames. yes it takes work, but the results are worth it.
if you have any questions you can contact me here, but for future and probabl quicker help you should reply to where-ever i originally posted that clip :)
