From 967ebe69cd363e5c45938b55c7aeabab73f2bc31 Mon Sep 17 00:00:00 2001
From: James <james.russo@heygen.com>
Date: Thu, 14 May 2026 23:45:37 +0000
Subject: [PATCH] docs(producer): carry chunk-seam + ProRes-intra-only
 rationale into mov-prores fixture
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Address @vanceingalls review on #848: the mp4-h264-sdr sibling fixture
explains the crossfade-straddles-frame-30 and continuous-rotation
chunk-seam design choices inline; mov-prores didn't. Add the parallel
comment so the next contributor reading either fixture finds the same
context. Notes specifically that ProRes is intra-only and therefore
exercises the QuickTime atom / -c copy contract rather than frame-level
state continuity.

🤖 Generated with [Claude Code](https://claude.com/claude-code)
---
 .../producer/tests/distributed/mov-prores/src/index.html     | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/packages/producer/tests/distributed/mov-prores/src/index.html b/packages/producer/tests/distributed/mov-prores/src/index.html
index 73b5d333e..a75643c96 100644
--- a/packages/producer/tests/distributed/mov-prores/src/index.html
+++ b/packages/producer/tests/distributed/mov-prores/src/index.html
@@ -88,6 +88,11 @@
     </div>
 
     <script>
+      // Same chunk-seam stressors as the mp4 siblings: a crossfade straddling
+      // the frame-30 seam (0.9-1.1s = frames 27-33) and a continuous icon
+      // rotation across every chunk boundary. The point with ProRes is the
+      // QuickTime atom contract — frame-level continuity is structurally
+      // satisfied because ProRes is intra-only.
       const tl = gsap.timeline({ paused: true });
       window.__timelines = window.__timelines || {};
       window.__timelines["main-comp"] = tl;