From 10f931c703c68b4fc856e09788dfe64579252bb8 Mon Sep 17 00:00:00 2001
From: peak3d <pfau@peak3d.de>
Date: Thu, 22 Jul 2021 10:48:36 +0200
Subject: [PATCH] Dazn sample duration workaround

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
---
 Source/C++/Core/Ap4TrunAtom.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Source/C++/Core/Ap4TrunAtom.cpp b/Source/C++/Core/Ap4TrunAtom.cpp
index c51f21d..77b7c6d 100644
--- a/Source/C++/Core/Ap4TrunAtom.cpp
+++ b/Source/C++/Core/Ap4TrunAtom.cpp
@@ -128,6 +128,12 @@ AP4_TrunAtom::AP4_TrunAtom(AP4_UI32        size,
     for (unsigned int i=0; i<sample_count; i++) {
         if (flags & AP4_TRUN_FLAG_SAMPLE_DURATION_PRESENT) {
             stream.ReadUI32(m_Entries[i].sample_duration);
+            // Workaround for dazn streams, which provide 24 -> 1 sequences
+            if (i && m_Entries[i].sample_duration == 1 && m_Entries[i - 1].sample_duration > 1)
+            {
+                m_Entries[i].sample_duration = m_Entries[i - 1].sample_duration >> 1;
+                m_Entries[i - 1].sample_duration -= m_Entries[i].sample_duration;
+            }
             --record_fields_count;
         }
         if (flags & AP4_TRUN_FLAG_SAMPLE_SIZE_PRESENT) {
-- 
2.30.2