[FFmpeg-user] Fluorescent White Balance Video Filters

[Roger]

I'm not finding much about fixing video having incorrect white space, more 
specifically video with incorrect or forgotten fluorescent white balance 
setting during recording.

I have a very old VHS recorded tape without a fluorescent white balance 
applied, and as such a green mask throughout the video.

I started examing one frame of the video, luckily having distinct red, white, 
blue colors and was viewing the frame within RawTherapee and tinkering with 
white balance settings.  Low and behold, after applying the "Philips TL85 
fluorescent" (designated as "F10 - Philips TL85") white balance preset profile, 
the red/green/blue values all appeared exact!

However, I cannot find this preset profile within RawTherapee installed files, 
nor do the *.pp3 sidecar files indicate specific values, hinting the values are 
either hard-coded or further buried within the installed system files, for 
which fgrep insensitive searching still fails to find the specifics of this 
filter.

Question, what is the proper method of applying such a missing white balance 
fluorescent filter to a video file using ffmpeg?

I'm surprised there's so little mentioned via a Google search, as users are 
always mucking-up the white balance settings while video recording or taking 
photos, unless using a color/gray card.


Roger

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