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Film editor: speed, detached clip sound, fades, clip-sound blend (render v5, #408) - #155
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…end (render v5, #408) Controls appear only when chapter_render advertises render_contract_version 5. - Speed 0.5-2x on selectedVideoRange.playback_rate; the first change pins the span the clip plays now; length N = floor(M/rate + 1/2) with exact fractions, as the exporter. - A clip's own sound plays at the clip's speed and is silent below 0.75x unless turned on (slow_rate_audio_enabled). Detach makes it an independent track at its current place, normal speed, movable and trimmable. - Music/voice/detached tracks get fade in/out (fade_in_s/fade_out_s, within the track). - filmCuts[chapter].clip_sound_crossfade_s (0/0.25/0.5/1, default 0.5) kept beside shotIds. - Remotion preview: playbackRate on video and own sound, volume envelopes for fades and the half-window boundary blend. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Frontend for inkseq/h3-studio#408 against the accepted render-v5 backend contract (fields
selectedVideoRange.playback_rate, trackdetached/slow_rate_audio_enabled/fade_in_s/fade_out_s,filmCuts[chapterId].clip_sound_crossfade_s). Gated onchapter_render.render_contract_version >= 5.Verified:
film-v5.test.jsreproduces Codex's fixture lengths (3 s @0.75 → 96, 2 s @2 → 24, 2 s @0.5 → 96; 216 frames) plus span pinning, allowlist, filmCuts sibling preservation, detach placement, slow-rate mute and fade limits. npm test all pass.🤖 Generated with Claude Code