dot-slot_chain: One slot's normalization chain

In compost: Video Compositing via 'FFmpeg'

One slot's normalization chain

Description

fill covers the rect (scale up + center-crop); fit contains it (scale down + centered black pad). Both normalize fps, SAR, pixel format, and timebase so heterogeneous sources (phone footage, 10-bit, 24/25 fps) overlay cleanly; non-reference chains freeze their last frame so a short take never goes black.

Usage

.slot_chain(i, rect, fit, fps, freeze, lbl)

Arguments

i	Zero-based input index.
rect	Integer c(x, y, w, h).
fit	"fill" or "fit".
fps	Reference frame rate.
freeze	Append the freeze (tpad clone) – FALSE for the reference.
lbl	Output pad label.

Value

One filter chain string.

compost documentation built on Aug. 4, 2026, 5:11 p.m.