time remapping is making my footage jumpy!
by nelson fernandes
on
Jun 23, 2008 at 7:36:38 pm
Hi guys. I'm working on a comp where I have a pre-rendered 360º animation of a school site. The idea is having the animation freezing at a certain frame, after that cuts to a still and comes back to animation again and starts where I left off. So, as I think any normal AE user would use I used Time remapping. When I output to a .avi, the result looks jumpy. Any ideas why? Thanks.
Re: time remapping is making my footage jumpy! by Dave LaRonde on Jun 23, 2008 at 8:02:17 pm
To me, it doesn't sound like there's a problem in you Time Remapping procedure. Could it be that you're looking at the render from AE on a media player, and your computer's hard drive simply can't keep up with the high bit rate from a high-quality file?
To check, you could render out something that's compressed to... oh, mp4, h.264, sorenson video 3... anything like that. If the plays smoothly, then your drive's choking on the high-bitrate file. It really isn't a problem, because you just proved that your work is okay, and you still want to make high-quality files in AE.
Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA
Re: time remapping is making my footage jumpy! by Jeremy Allen on Jun 23, 2008 at 10:34:28 pm
Are you suddenly freezing the footage, or slowing it down to a stop? If you drastically slow the motion, there may not be enough information to make it smooth, and the result will be jumpy. Is the render jumpy all over the whole footage, or just in the places you applied the time remapping?
Re: time remapping is making my footage jumpy! by Ron Coy on Jun 24, 2008 at 2:09:57 am
is your pre-rendered footage in a format like mpeg, MP4, h.264 or another format that throws away keyframe animation? If so, you'll need to convert it in another program to a video file format that After Effects can use.
You will always get weirdness with those file formats.
Re: time remapping is making my footage jumpy! by nelson fernandes on Jun 24, 2008 at 8:23:19 am
I have a sequence of 1000 .exr frames and a stop it suddenly to make the still comes in place. After the still has played its part, the sequence starts exactly where it's stopped previously. That's what I'm doing.
Re: time remapping is making my footage jumpy! by Ron Coy on Jun 24, 2008 at 2:00:27 pm
instead of using time remappping, just take your sequence up to the point of the freeze and put that on one layer. Then take the frozen frame, make it as long as you need it, and put it on another layer that begins where the other stops, then make a third layer of the remainder of the footage and put it where you need it to start up again.
I've done this many times to freeze animations where I need them to freeze for adding bullet points of info about the subject I'm illustrating in my animations. An example of this is at http://www.roncoy.com/Demo.html in the top right video where the animation swings around and stops to allow the text to point to the relevant parts of the model.
You can also time remap the moving footage parts to gradually slow down and speed back up, without having to jack around with the timing as much as when the time remap has to deal with the entire piece of footage as a whole. What I mean is, it's easier to work with time remap when you're only dealing with a speed up or slow down, as opposed to both on the same piece of footage on the same layer... at least in my experience.
Re: time remapping is making my footage jumpy! by Dave LaRonde on Jun 24, 2008 at 3:07:44 pm
You're doing the Time Remapping the right way. I stick with what I said earlier -- your hard drive can't keep up with the high-quality file you created, and I gave you advice on how to check it.
Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA
