[PyMOL] Exporting movie as PNG frames produces only single frame

[Christoph P. <cpa...@go...>]

Hi,

I'm currently trying out the improved movie functions of PyMOL 3.03
(timeline, scenes) which I think are a great improvement.  However, I
noticed when I want to write out a composition as single frames (PNG) using
the 'Export movie' function only one frame gets written (the first one).
When exporting as MPEG1 movie the composition is exported normally (all
frames). I also noticed creating a composition does not trigger the display
of the 'global frames panel', while in PyMOL 2.x adding a movie program
(e.g. scene loop) would display (and update) the number of frames the movie
contains.

In contrast, creating a morph (e.g. over 30 states) will trigger the
'global frames' panel showing 30 frames. When creating a 'state sweep'
movie from the morph using the movie commands the corresponding 60 frames
are shown (and played) in the timeline, but the 'global frames' panel still
shows only 30 frames. Also exporting the frames as PNGs will only export
the first 30 frames representing the different states, while the
MPEG1-export function will export the full state sweep movie.

I tried this with PyMOL 3.03 running under Linux and also Windows 10. The
observed behavior is the same.

Is there anything that's wrong in my approach?

Christoph