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Fade a clip in and out with ffmpeg on Windows (black or white, picture and sound): set the…
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What this guide covers
For anyone who wants a clip to fade in and out with its sound. A PowerShell script takes the fade-out start from the clip's own length, builds the picture and sound fades, and then measures the first, middle and last frame and the sound at both ends against the source. It ran only on generated test patterns and a sine tone, so real footage, music and speech are untested, and nothing was judged by eye or ear.
More about this guide
Guide ID: art_01M791CRY4J2G5NYJ28Y63TE3A
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Guide title
Fade a clip in and out with ffmpeg on Windows (black or white, picture and sound): set the fade-out start time from the clip's length, and measure that the first and last frames and the sound at both ends really faded
Coverage
For anyone who wants a clip to fade in and out with its sound. A PowerShell script takes the fade-out start from the clip's own length, builds the picture and sound fades, and then measures the first, middle and last frame and the sound at both ends against the source. It ran only on generated test patterns and a sine tone, so real footage, music and speech are untested, and nothing was judged by eye or ear.
Example
On a 10 s clip the script started the fade-out at 9 s; the first frame measured at the black level (16 of 255), the last frame at 19.5 (the frame before the end of the fade), and the sound at both ends about 25 dB below the middle, as a straight ramp gives. A plain fade-out written without a start time exited 0 but left everything after the first second black and silent.
Useful starting points
- Give the fade-out a start time equal to the clip length minus the fade; without st it starts at 0.
- Fade the picture and the sound from their own lengths when the two differ.
- A fade cannot be combined with stream copy; the picture is re-encoded.
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