Apply fade-in/out effect to input video.
This filter accepts the following options:
- type, t
-
The effect type – can be either "in" for fade-in, or "out" for a fade-out effect. Default is
in. - start_frame, s
-
Specify the number of the start frame for starting to apply the fade effect. Default is 0.
- nb_frames, n
-
The number of frames for which the fade effect has to last. At the end of the fade-in effect the output video will have the same intensity as the input video, at the end of the fade-out transition the output video will be completely black. Default is 25.
- alpha
-
If set to 1, fade only alpha channel, if one exists on the input. Default value is 0.
- start_time, st
-
Specify the timestamp (in seconds) of the frame to start to apply the fade effect. If both start_frame and start_time are specified, the fade will start at whichever comes last. Default is 0.
- duration, d
-
The number of seconds for which the fade effect has to last. At the end of the fade-in effect the output video will have the same intensity as the input video, at the end of the fade-out transition the output video will be completely black. If both duration and nb_frames are specified, duration is used. Default is 0.
Examples
-
Fade in first 30 frames of video:
fade=in:0:30
The command above is equivalent to:
fade=t=in:s=0:n=30
-
Fade out last 45 frames of a 200-frame video:
fade=out:155:45 fade=type=out:start_frame=155:nb_frames=45
-
Fade in first 25 frames and fade out last 25 frames of a 1000-frame video:
fade=in:0:25, fade=out:975:25
-
Make first 5 frames black, then fade in from frame 5-24:
fade=in:5:20
-
Fade in alpha over first 25 frames of video:
fade=in:0:25:alpha=1
-
Make first 5.5 seconds black, then fade in for 0.5 seconds:
fade=t=in:st=5.5:d=0.5