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Miguel Ángel
eee9b26fb7
A GSAP volume fade on an audio clip that starts after t=0 left the preview silent for the clip's whole length while the encoded render was correct. `mediaVolumeEnvelope` is meant to keep preview and render on one envelope, and its contract is "normalise, then read with track-relative seconds". The preview skipped both halves. `probeElementVolumeKeyframes` stamps each keyframe with the TIMELINE seek time it sampled at, and `normaliseEnvelope` — the function that rebases those onto the track — had exactly one caller, the renderer's PCM baker. The preview handed the raw keyframes to `interpolateVolumeGain` along with `relTime`, so for a clip at t=2 every lookup fell two seconds before the first keyframe and clamped to its volume: 0 for a fade-in. Rebase once, where the cache is filled, so the cached envelope has a single documented time base. Read it with elapsed-time-in-clip rather than `relTime`, which is a position inside the media SOURCE — it carries `mediaStart` and the playback rate, and only coincides with the envelope's time base for an untrimmed clip playing at 1x from zero. That second half also fixes a latent sibling: a trimmed clip read the wrong envelope point even when it started at 0.