From 92d66ea4d1816b72781f034fbb40cba83b5bba80 Mon Sep 17 00:00:00 2001
From: you <you@example.com>
Date: Thu, 19 Mar 2026 07:02:42 +0000
Subject: [PATCH] Fix VCR scrubber: limit replay to 50 packets from scrub point

Root cause: scrub replay was playing through the ENTIRE buffer
from scrub point to end (thousands of packets), racing the playhead
forward to now. Now caps replay at 50 packets from scrub point,
then pauses. Hit LIVE to resume real-time.
---
 public/live.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/public/live.js b/public/live.js
index 1739af3..47a0936 100644
--- a/public/live.js
+++ b/public/live.js
@@ -86,6 +86,8 @@
     VCR.playhead = -1;
     VCR.speed = 1;
     VCR.missedCount = 0;
+    VCR.scrubEnd = null;
+    VCR.dragPct = null;
     vcrSetMode('LIVE');
     const prompt = document.getElementById('vcrPrompt');
     if (prompt) prompt.classList.add('hidden');
@@ -161,8 +163,9 @@
     stopReplay();
     function tick() {
       if (VCR.mode !== 'REPLAY') return;
-      if (VCR.playhead >= VCR.buffer.length) {
-        // Caught up — pause instead of auto-resuming live
+      const endIdx = VCR.scrubEnd != null ? VCR.scrubEnd : VCR.buffer.length;
+      if (VCR.playhead >= endIdx) {
+        VCR.scrubEnd = null;
         vcrSetMode('PAUSED');
         return;
       }
@@ -613,6 +616,8 @@
             if (dist < minDist) { minDist = dist; closest = i; }
           });
           VCR.playhead = closest;
+          // Only replay ~50 packets from scrub point, not entire buffer to end
+          VCR.scrubEnd = Math.min(closest + 50, VCR.buffer.length);
           startReplay();
         })
         .catch(() => {});