Picture-Bound Sound
A door closes in a small room. Its impact, distance, reverberant tail, and the silence around it belong to the meaning of that exact shot. Broadcast calls this picture-bound sound design: effects, foley, room tone, environmental beds, and ambience judged against picture, scene, cut, claim, or editorial timeline.
broadcast.design_picture_sound@2 starts with PictureSoundBrief@1, locked picture digest/timebase, event/space roles, source/rights references, target channel/loudness profile, and acceptance criteria. Recording, synthesis, licensed layers, processing, or a compound video-model result can propose candidates. Each layer retains source, implementation, transforms, rights, time relation, and digest.
Hear the scene, then admit the result
PictureSoundRevision@1 and optional PictureSoundCueMap@1 bind event, place, material, distance, perspective, duration, continuity, cut relation, and uncertainty. Probes measure boundaries, clipping, channels, loudness, and format. Editorial review decides whether the sound communicates the visible event. Accepted selections seal as PictureSoundBundle@1 for Edit.
Riffmaw owns music; Language Edition owns spoken performance/captions against a locked source; Echo owns speech lifecycle; Foundry may own game-event sound. A reusable standalone library would need its own proved Composition records, judgment, finish, and recovery. Broadcast's scene does not create that owner.
When the video model also returns sound
Before execution, MediaFacetAuthoritySet@1 declares picture_sound, broadcast.studio revision 4, and exact PictureSoundBrief@1 digest. Core retains the technical attempt; Prism preserves compound/child digests, timebase, and provenance. Broadcast independently issues SemanticFacetAdmissionReceipt@1 after technical settlement. Successful demux, another owner's judgment, or generate_sound cannot replace it. Unexpected sound is quarantined/deleted; inseparable media requires every necessary owner to accept the exact compound use.
A changed picture, cut, source claim, timebase, or brief stales affected sound. Recorder, generator, renderer, or destination acknowledgement loss remains unknown until reconciled. Corrections create successors; sound acceptance itself supplies no final mux or publication authority.