Files
hyperframes/packages/engine/src
Vance Ingalls b75c5f56f4 feat(engine): let an FX tail decay instead of cutting it at the clip
The offline render ended at the last input sample, so a reverb or a delay
was still ringing when the context stopped. Measured on a 1.5 s tone
through a default reverb, the render cut at 1.524 s while the tail was
still at -29.7 dB — an audible chop, and the one place the render did not
match preview.

The length does not have to be guessed. Every tail here follows from its
own settings: a convolution is exactly as long as its impulse, and
`synthesizeReverbImpulse` derives that from room size; a delay's repeats
fall by `feedback` every `time`, so the count down to -60 dB is a log.
Everything else settles with its input — an all-pass chain has group
delay, not a tail, and a 9-second compressor release has no signal to
release once the clip stops.

`chainTailSeconds` sums them (the chain is serial, so a delay in front of
a reverb hands each repeat to the room), reads a lane's maximum rather
than the static knob where one is automated, and caps at 5 s — 5 s
between repeats at 0.95 feedback is eleven minutes of decay, and the
panel can dial exactly that.

The mixer's per-track atrim now allows the clip plus its tail; the atrim
after apad still holds every track to the composition's length, so a tail
can run over what follows but never extends the video.

Same fixture after: a smooth decay to -72 dB, last non-zero sample at
3.306 s against the 3.4 s the settings predict.
2026-08-06 10:59:25 -07:00
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