From f13c30e1f2d84dac8a824a8bd0d85f03b277060a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miguel=20=C3=81ngel?= <miguel.sierra@heygen.com>
Date: Mon, 11 May 2026 20:56:47 -0700
Subject: [PATCH] fix(core): skip media preloader activation in render mode
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mediaPreloader.refresh() was called unconditionally, setting lazy=true
for compositions with ≥6 clips even in render mode. player.seek then
called preloadAroundTime() which evicted clips via src clearing,
destroying buffered data needed for frame-accurate capture.

Skip refresh() when __HF_EXPORT_RENDER_SEEK_CONFIG is set so isLazy()
stays false and the preloader is completely inert during renders.
---
 packages/core/src/runtime/init.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/core/src/runtime/init.ts b/packages/core/src/runtime/init.ts
index 65c19bc9f..f10e3fd48 100644
--- a/packages/core/src/runtime/init.ts
+++ b/packages/core/src/runtime/init.ts
@@ -1243,7 +1243,7 @@ export function initSandboxRuntimeModular(): void {
       mediaEl.addEventListener("durationchange", scheduleMetadataDurationHydration);
     }
 
-    if (newElementsBound) {
+    if (newElementsBound && !isRenderMode) {
       mediaPreloader.refresh();
     }