Commit f5c8a095 for libheif

commit f5c8a095bb9e0e47e3eab8f85d3db0d9b65adf12
Author: Dirk Farin <dirk.farin@gmail.com>
Date:   Thu Oct 15 21:00:39 2026 +0200

    Initialize the data_reference_index of the urim sample entry

    Box_URIMetaSampleEntry never initialized data_reference_index, so the
    urim sample entry of a URI metadata track was written with whatever
    the memory held. The index must be 1 to refer to the single dref entry.

diff --git a/libheif/sequences/seq_boxes.h b/libheif/sequences/seq_boxes.h
index 462a44f9..e8187d91 100644
--- a/libheif/sequences/seq_boxes.h
+++ b/libheif/sequences/seq_boxes.h
@@ -700,7 +700,7 @@ protected:
 private:
   // from SampleEntry
   //const unsigned int(8)[6] reserved = 0;
-  uint16_t data_reference_index;
+  uint16_t data_reference_index = 1;
 };