eq (1) - contrast¶
Watch on youtube.comcontrast=-2.0 … 2.0¶
The value must be a float value in range -2.0 to 2.0. The default value is “1”.
eq=contrast=-2.0
00:00:00#! /bin/sh
ifn="Pexels_flowers_fast.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=contrast=-2.0" \
-an "${pref}_${ifnb}.mp4"
eq=contrast=-1.5
00:00:08#! /bin/sh
ifn="Pexels_flowers_fast.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=contrast=-1.5" \
-an "${pref}_${ifnb}.mp4"
eq=contrast=-1.0
00:00:15#! /bin/sh
ifn="Pexels_flowers_fast.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=contrast=-1.0" \
-an "${pref}_${ifnb}.mp4"
eq=contrast=0
00:00:23#! /bin/sh
ifn="Pexels_flowers_fast.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=contrast=0" \
-an "${pref}_${ifnb}.mp4"
eq=contrast=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=contrast=1.0" \
-an "${pref}_${ifnb}.mp4"
eq=contrast=1.5
00:00:38#! /bin/sh
ifn="Pexels_flowers_fast.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=contrast=1.5" \
-an "${pref}_${ifnb}.mp4"
eq=contrast=2.0
00:00:46#! /bin/sh
ifn="Pexels_flowers_fast.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=contrast=2.0" \
-an "${pref}_${ifnb}.mp4"
Using expression¶
eq=contrast=(-2.0+t/30*4.0):eval=frame
In this example, since “${ifn}” is a video of 30 seconds, it instructs to change by 1 / 7.5 per second.
00:00:53#! /bin/sh
ifn="Pexels_flowers.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=contrast=(-2.0+t/30*4.0):eval=frame" \
-an "${pref}_${ifnb}.mp4"