[FFmpeg-user] How to brighten part of a dark video?

[Gilles]

On Fri, 18 Sep 2015 11:44:29 +0200, Moritz Barsnick <barsnick at gmx.net>
wrote:
>$ ffmpep -i vlcsnap_2015_09_18_11h21m29s599.png -filter_complex "split=2[v1][v2]; [v1]crop=200:300:520:0,mpblablabla[brightpart]; [v2]mpbablabla[darkpart]; [darkpart][brightpart]overlay=x=520:y=0[v]" -map "[v]" corrected.png
>
>I don't know if the mp filter or on of the lut filters is best.
>Whatever you use, insert it instead of "mpblablabla" above.

Thanks much.

What kind of infos should I use for the "mpblablabla" part?

I tried to read the official doco, but it has no examples for newbies:
https://ffmpeg.org/ffmpeg-filters.html

For a test, I tried this, but it's NOK:
=================
#15-second sample

ffmpeg -ss 00:05:00 -i input.mpeg -t 15 -filter_complex
"split=2[v1][v2];
[v1]crop=200:300:520:0,mp=eq2=1:1.68:0.3:1.25:1:0.96:1[brightpart];
[v2]mp=eq2=1:1.68:0.3:1.25:1:0.96:1[darkpart];
[darkpart][brightpart]overlay=x=520:y=0[v]" -map "[v]" -c:v libx264
-c:a copy -f mp4 output.mp4

[AVFilterGraph @ 04bebf00] No such filter: 'mp'
Error initializing complex filters.
Invalid argument
=================
ffmpeg -ss 00:05:00 -i input.mpeg -t 15 -filter_complex
"split=2[v1][v2];
[v1]crop=200:300:520:0,eq2=1:1.68:0.3:1.25:1:0.96:1[brightpart];
[v2]eq2=1:1.68:0.3:1.25:1:0.96:1[darkpart];
[darkpart][brightpart]overlay=x=520:y=0[v]" -map "[v]" -c:v libx264
-c:a copy -f mp4 output.mp4

[AVFilterGraph @ 04c73f80] No such filter: 'eq2'
Error initializing complex filters.
Invalid argument
=================

I posted a snapshot, but I'm obviously dealing with a video (MPEG).

Thank you.