----------- EDIT: this explanation is not true, see the posts below ..............................................
Mistery solved, thanks, I can process now my MLV timelapses with ETTR on.
The problem was the lens.
In my previous tests, I was using a manual lens, following the advice in ML user guide, section "Shoot - Intervalometer". The guide suggests to use a manual lens, or an EF lens with aperture locked (I don't know how to do that
), and unscrewed, to avoid flicker.
But I have seen that ETTR with the manual lens fools the "silent" module when writing the MLV file. The lens I used was a m42 Pentax lens coupled to the 500D through a ring adapter with an EMF programmable AF confirm chip.
With a Canon EF lens, it works fine. That might be the first thing I should have tested.
I have shot the timelapse indoors usiing a dimmed lamp. I have altered the light intensity several times during the test, and ETTR continuosly adjusts the exposure time, everything works fine.
Next test will be outdoors during a sunset, or perhaps a moonrise nightshot beside the sea
This will be a much more interesting timelapse than my living room lighted with a dimmed lamp
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