[FFmpeg-trac] #3013(FFmpeg:new): Determination of brightness or light level

[FFmpeg]

#3013: Determination of brightness or light level
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             Reporter:  kps1ny       |                     Type:
               Status:  new          |  sponsoring request
            Component:  FFmpeg       |                 Priority:  normal
             Keywords:               |                  Version:
  brightness,light level             |  unspecified
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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 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

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/3013>
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