eq (2) - brightness¶
Watch on youtube.combrightness=-1.0 … 1.0¶
The value must be a float value in range -1.0 to 1.0. The default value is “0”.
eq=brightness=-1.0
00:00:00#! /bin/sh
ifn="Pexels_flowers_fast.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=brightness=-1.0" \
-an "${pref}_${ifnb}.mp4"
eq=brightness=-0.5
00:00:08#! /bin/sh
ifn="Pexels_flowers_fast.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=brightness=-0.5" \
-an "${pref}_${ifnb}.mp4"
eq=brightness=0.0
00:00:15#! /bin/sh
ifn="Pexels_flowers_fast.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=brightness=0.0" \
-an "${pref}_${ifnb}.mp4"
eq=brightness=0.5
00:00:23#! /bin/sh
ifn="Pexels_flowers_fast.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=brightness=0.5" \
-an "${pref}_${ifnb}.mp4"
eq=brightness=1.0
00:00:31#! /bin/sh
ifn="Pexels_flowers_fast.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=brightness=1.0" \
-an "${pref}_${ifnb}.mp4"
Using expression¶
eq=brightness=(-1.0+t/30*2.0):eval=frame
In this example, since “${ifn}” is a video of 30 seconds, it instructs to change by 1 / 15 per second.
00:00:38#! /bin/sh
ifn="Pexels_flowers.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=brightness=(-1.0+t/30*2.0):eval=frame" \
-an "${pref}_${ifnb}.mp4"