filters

[M.Shiver]

(solved)

[butterw]

-vf hue=s=1:b=1,eq=gamma=1.0

There is no magic probably (and it does nothing with those default values). Use a gui to preview color adjustments.

[jagabo]

b=1 isn't the default (b=0 is the default). It brightens every pixel by a fixed amount (about 30 units). This results in washed out blacks and blown out whites. The other two setting do nothing. You should calibrate your display instead of ruining your videos.

[M.Shiver]

(solved)

[jagabo]

This issue isn't whether some videos you used those settings on looked better. It's that you can't blindly use those settings for all videos.

[M.Shiver]

(solved)

[M.Shiver]

(solved)

[butterw]

Very poor quality videos are rarer nowadays (more bitrate, better codecs, etc.), but many non-pro videos still aren't great quality.

Don't do pre-encode adjustments if none are needed. It's easy to mess-up (especially with ffmpeg).
A common mistake would be to assume a correction that worked for one video works for all others. Changes cannot be reversed unless you have kept a copy of the source.

https://ffmpeg.org/ffmpeg-filters.html#toc-hue:
b Specify the brightness in the [-10,10] range. It accepts an expression and defaults to "0".