From aaac78a07324edd2165255e76fa0434fd0eb23c2 Mon Sep 17 00:00:00 2001
From: Brian Popow <popow@gmx.de>
Date: Wed, 3 Jul 2024 18:12:15 +0200
Subject: [PATCH] When TemporalDelimiter header is encountered, seenFrameHeader
 flag will be set to false

---
 .../Formats/Heif/Av1/OpenBitstreamUnit/ObuReader.cs           | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/ImageSharp/Formats/Heif/Av1/OpenBitstreamUnit/ObuReader.cs b/src/ImageSharp/Formats/Heif/Av1/OpenBitstreamUnit/ObuReader.cs
index 01df2728e8..9c6a50fb96 100644
--- a/src/ImageSharp/Formats/Heif/Av1/OpenBitstreamUnit/ObuReader.cs
+++ b/src/ImageSharp/Formats/Heif/Av1/OpenBitstreamUnit/ObuReader.cs
@@ -128,6 +128,9 @@ internal class ObuReader
 
                     break;
                 case ObuType.TemporalDelimiter:
+                    // 5.6. Temporal delimiter obu syntax.
+                    seenFrameHeader = false;
+                    break;
                 default:
                     // Ignore unknown OBU types.
                     // throw new InvalidImageContentException($"Unknown OBU header found: {header.Type.ToString()}");
@@ -900,6 +903,7 @@ internal class ObuReader
                 frameInfo.FramePresentationTime = reader.ReadLiteral((int)sequenceHeader!.DecoderModelInfo!.FramePresentationTimeLength);
             }
 
+            // int refreshFrameFlags = 0;
             if (sequenceHeader.IsFrameIdNumbersPresent)
             {
                 frameInfo.DisplayFrameId = reader.ReadLiteral(idLength);