getting frameStart and frameEnd while customizing frameburn.mu script

Hi,

I am trying to get the frameStart() and frameEnd() (or any other frame info) using the "commands" api module but I keep on getting "0"

this is the command I am using in the frameburn.mu script:

----------------------------------------------------------------------------

int frameEnd;

frameEnd   = commands.frameEnd();

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what am I doing wrong ? is there a "right" way to get it ? our artists wants to see the "frame-in" "frame-out" and "total-frames" since I am running the script

on a video source (not image sequence) I don't know anything about the frame range.

I will really appreciate your answer !

Thanks

Ran