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Old 13th September 2018, 07:29   #1  |  Link
zn
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Join Date: Jan 2009
Posts: 83
mpv vs ffmpeg (ffplay) contrast, brightness, saturation, gamma (equalizer settings)

How I can translate mpv contrast, brightness, saturation, gamma setting (adjustable via command line and using hot keys F1-F6) into ffmpeg eq filter range?
For example, if I want to get the same color in ffmpeg (ffplay) using -vf "eq=gamma=0.X" (range 0.1..1.0), as I get with mpv gamma +20 (range -100..+100)

mpv:
Quote:
Equalizer

--brightness=<-100-100>
Adjust the brightness of the video signal (default: 0). Not supported by all video output drivers.

--contrast=<-100-100>
Adjust the contrast of the video signal (default: 0). Not supported by all video output drivers.

--saturation=<-100-100>
Adjust the saturation of the video signal (default: 0). You can get grayscale output with this option. Not supported by all video output drivers.

--gamma=<-100-100>
Adjust the gamma of the video signal (default: 0). Not supported by all video output drivers.

--hue=<-100-100>
Adjust the hue of the video signal (default: 0). You can get a colored negative of the image with this option. Not supported by all video output drivers.
ffmpeg (ffplay) eq filter (-vf "eq=gamma=0.5"):
Quote:
10.50 eq

Set brightness, contrast, saturation and approximate gamma adjustment.

The filter accepts the following options:

contrast
Set the contrast expression. The value must be a float value in range -2.0 to 2.0. The default value is "1".

brightness
Set the brightness expression. The value must be a float value in range -1.0 to 1.0. The default value is "0".

saturation
Set the saturation expression. The value must be a float in range 0.0 to 3.0. The default value is "1".

gamma
Set the gamma expression. The value must be a float in range 0.1 to 10.0. The default value is "1".

gamma_r
Set the gamma expression for red. The value must be a float in range 0.1 to 10.0. The default value is "1".

gamma_g
Set the gamma expression for green. The value must be a float in range 0.1 to 10.0. The default value is "1".

gamma_b
Set the gamma expression for blue. The value must be a float in range 0.1 to 10.0. The default value is "1".

gamma_weight
Set the gamma weight expression. It can be used to reduce the effect of a high gamma value on bright image areas, e.g. keep them from getting overamplified and just plain white. The value must be a float in range 0.0 to 1.0. A value of 0.0 turns the gamma correction all the way down while 1.0 leaves it at its full strength. Default is "1".
Quote:
10.89 hue

Modify the hue and/or the saturation of the input.

It accepts the following parameters:

h
Specify the hue angle as a number of degrees. It accepts an expression, and defaults to "0".

s
Specify the saturation in the [-10,10] range. It accepts an expression and defaults to "1".

H
Specify the hue angle as a number of radians. It accepts an expression, and defaults to "0".

b
Specify the brightness in the [-10,10] range. It accepts an expression and defaults to "0".

Last edited by zn; 13th September 2018 at 07:41.
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Old 13th September 2018, 09:32   #2  |  Link
richardpl
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Join Date: Jan 2012
Posts: 91
Short answer: you can not.

The eq/hue works in yuv colorspace while mpv one works in rgb.
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Old 13th September 2018, 10:09   #3  |  Link
zn
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Join Date: Jan 2009
Posts: 83
I want approximate formula, 100% accuracy not needed. Looks like mpv gamma+20 f ≈ 1.6 in ffmpeg

gamma_r, gamma_g, gamma_b - may be these filters can help for rgb gamma correction?

Quote:
gamma_r
Set the gamma expression for red. The value must be a float in range 0.1 to 10.0. The default value is "1".

gamma_g
Set the gamma expression for green. The value must be a float in range 0.1 to 10.0. The default value is "1".

gamma_b
Set the gamma expression for blue. The value must be a float in range 0.1 to 10.0. The default value is "1".

Last edited by zn; 13th September 2018 at 11:38.
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