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fix(studio): make the volume fader tell the truth about the gain it writes (#3305)

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* fix(studio): make the volume fader tell the truth about the gain it writes

The fader travels in dB, so its stops are irrational values; serializing them
through the generic two-decimal numeric formatter collapsed the bottom quarter
of its travel onto "0" — a hard mute — and made the knob jump on release
everywhere below unity. Both panels now use the exact serializer, which
round-trips every integer stop back to itself.

Raise the volume automation lane to the same ceiling the fader reaches.
Clamping the lane at unity meant automating a boosted clip silently discarded
the boost, and the panel disables the fader while a lane owns the level, so
there was no way back. This rescales the lane's vertical axis: unity now sits
a quarter of the way up rather than at the top.

Add audio_volume_tween_overrides_gain. Tween values on `volume` are absolute —
they replace the authored gain rather than scaling it — so a clip carrying both
plays at whatever the tween names, and the fader gives no sign of it. The rule
reuses the tween detector the sibling lane/tween rule already has.

* fix(lint): treat a missing data-volume as unity, not as silence

readAttr returns null when the attribute is absent, and Number(null) is 0 —
finite, and not 1 — so a clip carrying NO data-volume cleared both filters and
was reported as authored at silence. Both halves of that were false: absent
means unity everywhere else in the runtime.

It fired on exactly the case the rule exists to bless. The docs this PR edits
say data-volume is the baseline for elements no tween touches, so a tweened
clip is expected not to carry one — the common audio fade. A warning does not
fail check, but an agent reading the fixHint would have written a gain to
correct a level that was never wrong.
This commit is contained in:
Miguel Ángel
2026-08-19 18:08:23 -04:00
committed by GitHub
parent b3c43e2480
commit 228eabd43f
15 changed files with 243 additions and 108 deletions
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skills/hyperframes-core/references/variables-and-media.md
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@@ -98,7 +98,7 @@ Video elements must be muted and inline. Audio must be a separate `<audio>` elem
- **Do not** nest video inside a timed wrapper. Put timing on the media element or keep the wrapper untimed.
- Add `crossorigin="anonymous"` for external media that needs canvas capture or pixel inspection.
- Audio always lives on a separate `<audio>` element — even if its source file is the same as a `<video>`. The `<video>` is muted; the `<audio>` carries sound.
- For volume fades/ducking, animate `volume` on the timeline (`tl.to("#bgm", { volume: 0, duration: 1 }, "outro")`) rather than swapping `data-volume`. The runtime probes the timeline's volume keyframes and applies them identically in preview and render; `data-volume` is the static baseline for elements no tween touches.
- For volume fades/ducking, animate `volume` on the timeline (`tl.to("#bgm", { volume: 0, duration: 1 }, "outro")`) rather than swapping `data-volume`. The runtime probes the timeline's volume keyframes and applies them identically in preview and render; `data-volume` is the static baseline for elements no tween touches. A tween's values REPLACE that baseline rather than scaling it, so on a clip whose gain is not `1` you scale the tween's targets instead (`{ volume: 1.95 }`, not `{ volume: 1 }`) — `lint` warns with `audio_volume_tween_overrides_gain` when the two disagree.
For media duration: `<video>` and `<audio>` can omit `data-duration` if the media's intrinsic length is known and you want the full clip. Otherwise provide `data-duration` explicitly.