Actions Reference

nil

Do nothing. Keep the section unchanged at normal speed and pitch.

cut

Remove the section completely from the output.

speed:float32

Range: (0.0, 99999.0)

Change the playback speed while preserving pitch via time-stretching. 1.0 = unchanged, 2.0 = twice as fast, 0.5 = half speed. Implemented with ffmpeg's atempo filter.

varispeed:float32

Range: [0.2, 100.0]

Change the playback speed by resampling, so pitch shifts along with it, like analog tape or vinyl. 1.0 = unchanged, 2.0 = twice as fast and an octave higher. Implemented with ffmpeg's asetrate + aresample filters.

volume:float32

Scale the audio volume by val. 1.0 = unchanged, 0.5 = half (-6 dB), 2.0 = double (+6 dB).

deesser:intensity[:max[:freq]]

Range: each [0.0, 1.0]

Reduce harsh "s" and "sh" sibilance in the section. Implemented via ffmpeg's deesser filter.

Positional args: intensity sets how much to de-ess (0.0 = none, 1.0 = maximum), max caps the reduction (default 0.5), and freq sets the split frequency (default 0.5).

invert

Invert every pixel in the section, producing a photo-negative.

hflip

Flip the section horizontally, mirroring it left to right.

vflip

Flip the section vertically, mirroring it top to bottom.

zoom:float32

Range: (0.0, 100.0]

Scale the picture about its center by val. 1.0 = no zoom, 2.0 = zoom in 2x, 0.5 = zoom out 2x.

opacity:unorm16

Range: [0.0, 1.0]

Blend the section against the background. 1.0 = fully opaque, 0.0 = fully transparent.

blur:float32

Range: [0.0, 1024.0]

Gaussian-blur the picture by sigma = val. 0.0 = no blur; larger values blur more.

brightness:snorm16

Range: [-1.0, 1.0]

Shift brightness by adding an equal offset to the R, G, and B channels. 0.0 = unchanged, positive brightens, negative darkens. Implemented via ffmpeg's lutrgb filter.

brighthue:snorm16

Range: [-1.0, 1.0]

Shift luma by offsetting the Y channel. 0.0 = unchanged, positive brightens, negative darkens.

contrast:float32

Range: [-2.0, 2.0]

Scale contrast around mid-gray. 1.0 = unchanged, higher values increase contrast, lower values reduce it. Implemented via ffmpeg's lutyuv filter.

saturation:float32

Range: [0.0, 3.0]

Scale color saturation. 1.0 = unchanged, 0.0 = grayscale, higher values are more vivid. Implemented via ffmpeg's lutyuv filter.

lens:k1[:k2]

Range: each [-1.0, 1.0]

Distort the picture like a camera lens. With no arguments, a fun fisheye is applied. Implemented via ffmpeg's lenscorrection filter.

Positional args: k1 is the quadratic correction factor and k2 the double-quadratic factor. Negative values bulge the image outward (fisheye); positive values pinch it inward (pincushion).

Quick reference

Action Arguments Range Type Summary
nil — — AV Do nothing.
cut — — AV Remove the section completely from the output.
speed float32 (0.0, 99999.0) AV Change the playback speed while preserving pitch via time-stretching.
varispeed float32 [0.2, 100.0] AV Change the playback speed by resampling, so pitch shifts along with it, like analog tape or vinyl.
volume float32 — A Scale the audio volume by val.
deesser intensity[:max[:freq]] each [0.0, 1.0] A Reduce harsh "s" and "sh" sibilance in the section.
invert — — V Invert every pixel in the section, producing a photo-negative.
hflip — — V Flip the section horizontally, mirroring it left to right.
vflip — — V Flip the section vertically, mirroring it top to bottom.
zoom float32 (0.0, 100.0] V Scale the picture about its center by val.
opacity unorm16 [0.0, 1.0] V Blend the section against the background.
blur float32 [0.0, 1024.0] V Gaussian-blur the picture by sigma = val.
brightness snorm16 [-1.0, 1.0] V Shift brightness by adding an equal offset to the R, G, and B channels.
brighthue snorm16 [-1.0, 1.0] V Shift luma by offsetting the Y channel.
contrast float32 [-2.0, 2.0] V Scale contrast around mid-gray.
saturation float32 [0.0, 3.0] V Scale color saturation.
lens k1[:k2] each [-1.0, 1.0] V Distort the picture like a camera lens.

Version 30.3.1
Generated: 2026-05-30.