From e855326cffb23f935f56c7411bb79f479a8db9c4 Mon Sep 17 00:00:00 2001
From: Aidan Ridley <aidan.ridley@charter.corp-partner.google.com>
Date: Wed, 26 Apr 2023 17:18:14 -0600
Subject: [PATCH] fix:  PERIOD_FLATTENING_FAILED error with shaka 4.3.4 that
 did not occur with shaka 3.1.2 #5183  (#5188)

Fixed handling of manifest with new codecs in later periods by adding
check for empty matchedStreams array in createNewOutputStrems()

Fixes #5183
---
 lib/util/periods.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/util/periods.js b/lib/util/periods.js
index e5b9072ab6..b80b1b6cb5 100644
--- a/lib/util/periods.js
+++ b/lib/util/periods.js
@@ -730,7 +730,7 @@ shaka.util.PeriodCombiner = class {
       // in advance.  concat() will add them to the output's MetaSegmentIndex.
     }
 
-    if (!outputStream.matchedStreams) {
+    if (!outputStream.matchedStreams || !outputStream.matchedStreams.length) {
       // This is not a stream we can build output from, but it may become part
       // of another output based on another period's stream.
       return null;