animation slow down

Support Animation and Rigging
1

I have rendered a short animation at 320 x 240 and all look ok

when I re-render it at 640 x 480 everything is slowed down?

whats the reason for this

thanks

lilo

2

320 x 240 = 76,800 pixels

640 x 480 = 307,200 pixels

Since most rendering implementations require more or less the same amount of time to render a pixel, and blender definitely falls in that category, rendering 4 times as many pixels is going to take 4 times as much time.

3

hi zaz,

thanks for the reply

it was not the rendering time I was wondering about,

but its the result of the render

so at the lower resolution the avi jpeg plays fine from within blender

but when rendered out at 640 x 480 the resulting avi plays much slower??

any ideas

thanks

lilo

4

I assume that you are referring to the playback of the animation, and not the time it takes to render the animation.

Various players are better/worse at running video files, and some of them run into serious problems when you give them large display areas.

Some codecs and formats (I think MPEG is one of them) allow you to sepecify that the playback must stay in sync with the frame rate. So if the player is going slow, it will drop frames in order to keep the playback at the right speed. Otherwise, you end up with the problem you are describing: all the frames play back, but the rate slows down.

5

Hey lilo. Sorry, I thought I looked at your post header and saw a low post count, so I answered the wrong question, :).

Strange, I haven’t seen that issue, but then I don’t render directly to .avi much.

If you don’t just have a really slow computer and you’re playing it back in blender, it sounds like either a blender problem, or possibly your video drivers/opengl libs.

Have you tried playing it outside of blender ? Double check your Frs/sec also, maybe that got changed somehow.

You could try rending to png and encoding to avi with MPlayer’s mencoder if nothing else resolves it.

6

zaz wrote

Hey lilo. Sorry, I thought I looked at your post header and saw a low post count, so I answered the wrong question, .

no problem :smiley:

can’t see an obvious reason for this to happen

will keep digging :smiley: :smiley:

have a good one

lilo