VMD-L Mailing List

From: John Stone (johns_at_ks.uiuc.edu)
Date: Mon Dec 08 2003 - 23:58:26 CST

Ioana,
  Unfortunately, most of the video codecs that work with the
vmdmovie plugin only support one or two frame rates. This means
that in order to achieve the playback rate you desire, you'll need
to replicate frames in your trajectory such that each frame is copied
N times, where N is the integer factor "slower" that you want your
movie to play. MPEG only has three common frame rates, 24fps, 25fps,
and 30fps (and the drop-frame equivalents), and the 'ppmtompeg' encoder
used by the vmdmovie plugin only does one frame rate in the older versions,
so thus far there hasn't been much latitude in allowing other frame rates.
I do plan to work on improving the vmdmovie plugin so that some of these
things can be done automatically, but at the present moment, the easiest
way for you to get the desired frame rate will be to replicate your frames.
Let me know if you need more help with this.

Thanks,
  John Stone
  vmd_at_ks.uiuc.edu

On Mon, Dec 08, 2003 at 04:10:49PM -0800, Ioana Cozmuta wrote:
> Hi Vmd users,
>
> How do you set the frame rate in the vmdplugin for making a movie?
> step in making a movie via VMD? I can
> I have no problem generating a movie but when I play them
> back they're extremely fast and basically I can not see anything that I
> want to show! I have about 50 frames in the loaded trajectory file, and
> the frame rate when playing the trajectory file in VMD is ok. However the
> .mpg is way too fast!
>
> Should decreasing the variable framerate in the
>
> /plugins/noarch/tcl/vmdmovie1.1/vmdmovie.tcl
>
> be decreased?
>
> variable framerate 24 ;# playback frame rate of animation
>
> I would appreciate your help. Thank you,
>
> Ioana 

-- 
NIH Resource for Macromolecular Modeling and Bioinformatics
Beckman Institute for Advanced Science and Technology
University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801
Email: johns_at_ks.uiuc.edu                 Phone: 217-244-3349              
  WWW: http://www.ks.uiuc.edu/~johns/      Fax: 217-244-6078