<p>They differ in rate of progression, i.e. fade is a linear progression, so that at half the duration, fade status is 50% i.e. both inputs are equally mixed. For fadefast, it starts fast and then slows down. Opposite for fadeslow.</p>

CC BY-SA 4.0
2023-02-08T04:21:17.090Z
2023-02-08T04:21:17.090Z
Gyan
<p>In the <code>xfade</code> filter, the speed of transition may be controlled by the <code>duration=</code> parameter – longer duration implies slower transition and vice versa.</p>
<p>So why are there – beside the <code>fade</code> value for the <code>transition=</code> parameter – other 2 values for the same effect, <code>fadefast</code> and <code>fadeslow</code>? What is the difference?</p>

<ffmpeg><transitions>
Fade transition - fade vs. fadefast vs. fadeslow
MarianD
# Fade transition - fade vs. fadefast vs. fadeslow

(Asked by: username_0 on 2023-02-07)

In the `xfade` filter, the speed of transition may be controlled by the `duration=` parameter – longer duration implies slower transition and vice versa.

So why are there – beside the `fade` value for the `transition=` parameter – other 2 values for the same effect, `fadefast` and `fadeslow`? What is the difference?

**Tags:** ffmpeg, transitions


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## 1 answers

### Answer by username_1 on 2023-02-08. Score: 1 | Accepted answer

They differ in rate of progression, i.e. fade is a linear progression, so that at half the duration, fade status is 50% i.e. both inputs are equally mixed. For fadefast, it starts fast and then slows down. Opposite for fadeslow.


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