From f0a9bf3ffe16bf2b39aa1b7c6aebb80d698d0f4d Mon Sep 17 00:00:00 2001
From: Rob Walch <rwalch@apple.com>
Date: Wed, 24 May 2023 08:59:22 -0700
Subject: [PATCH] Fix TS probing by requiring 2-3 packet start bytes to be
 matched Fixes #5501

---
 src/demux/tsdemuxer.ts | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/demux/tsdemuxer.ts b/src/demux/tsdemuxer.ts
index 8add100249d..ab2d9a73516 100644
--- a/src/demux/tsdemuxer.ts
+++ b/src/demux/tsdemuxer.ts
@@ -111,7 +111,14 @@ class TSDemuxer implements Demuxer {
           if (!foundPat && parsePID(data, j) === 0) {
             foundPat = true;
           }
-          if (foundPat && j + PACKET_LENGTH > scanwindow) {
+          if (foundPat && data[j + PACKET_LENGTH] === 0x47) {
+            // If length supports 3 packets, confirm
+            if (
+              length > j + PACKET_LENGTH * 2 &&
+              data[j + PACKET_LENGTH * 2] !== 0x47
+            ) {
+              return -1;
+            }
             return i;
           }
         } else {