Mx:videodisplay.totalTime = -1

Question

I am trying to build a custom-progress bar which includes
both the download progress as well as the play progress of an
mx:videodisplay control, and allows the user to seek based on where
on the progress bar they click.
Here's how I am doing it:
capture the position of the click from mouseEvent
use it to calculate a percentage for how far down the
progress bar the click occurred (0.0-1.0)
multiply percentage by video.totalTime to determine what the
desired time is
set playheadTime equal to desired time
My problem is that the totalTime property is returning -1.
The video, however, remains playing, and the playheadTime property
is legit too - the clock still counts up every second of the video
as it plays. But since the totalTime property is -1 everything else
gets screwed up, and when I attempt to seek anywhere, i get Error
1003: Invalid Seek - understandable since seeking to a negative
time doesn't make sense.
Any information anyone has about how the totalTime property
is calculated would be appreciated. Also below are a couple pieces
of the code:

Answer 1

Update. When I add single line "System.gc()" in onTimer function I no longer have a crash and memory usage is constant.
Best Regards, Aleksey