Determination of brightness or light level

[Ken Stuart]

Hello. It would be of great help if FFmpeg could analyze a still image (or frame) and output a number representing its overall brightness or light level.

Here's the problem I'm trying to solve:

1) A camera takes one photo every five minutes each day.

2) The image closest to noon from each day is appended to a growing continuous timelapse movie.

The problem is that those noon photos vary a lot in terms of light levels, because of clouds (or the lack of them). I'd like to be able to have FFmpeg look through all the photos from 11am to 1pm and grab the one closest to a consistent specified light level.

I can write the script to loop through potential photos, but I don't know whether or how FFmpeg can analyze and report some value on which to choose the best image from amongst the files we have.

After posting on the general FFmpeg forum for help and receiving no responses, someone suggested requesting this capability as a feature.

Thanks for your consideration,
-Ken

[Michael Niedermayer]

Fixed in 09725c1d2bed15b52b7c59dbb208f5f78d325ccc