I haven’t used VMD for a long time. Instead, I use pyMOL and MOLMOL to make most of the figures for presentation.
This week, I found that VMD has a very good extension that help you to generate movies quickly as long as your linux machine has imagemagic or other tools installed. See VMD official site to get more detailed instruction.
Here is an example I use protein GB1 to generate a 10 seconds movie. PDB code is 1GB1 which is a NMR ensemble structure with 60 models. This video put in youtube show you how flexible of the GB1 protein is by looking at the 60 models.