diff --git a/src/helper_functions.hpp b/src/helper_functions.hpp
index 0d530e71..5eb83054 100644
--- a/src/helper_functions.hpp
+++ b/src/helper_functions.hpp
@@ -4,8 +4,8 @@
 #define HELPER_FUNCTIONS_HPP
 
 #include <string>
-#include "types.hpp"
 #include "basicio.hpp"
+#include "types.hpp"
 /*!
   @brief Convert a (potentially not null terminated) array into a
   std::string.
@@ -39,26 +39,24 @@ char returnHex(int n);
   @return Returns std::string object .
  */
 
-
-static constexpr size_t BYTE  = 0x1;
+static constexpr size_t BYTE = 0x1;
 static constexpr size_t WCHAR = 0x2;
-static constexpr size_t WORD  = 0X2;
+static constexpr size_t WORD = 0X2;
 static constexpr size_t DWORD = 0x4;
 static constexpr size_t QWORD = 0x8;
-static constexpr size_t GUID  = 0x10;
+static constexpr size_t GUID = 0x10;
 
 std::string toString16(Exiv2::DataBuf& buf);
 
+[[nodiscard]] uint64_t readQWORDTag(Exiv2::BasicIo::UniquePtr& io);
 
-[[nodiscard]] uint64_t readQWORDTag(Exiv2::BasicIo::UniquePtr& io) ;
-
-[[nodiscard]] uint32_t readDWORDTag(Exiv2::BasicIo::UniquePtr& io) ;
+[[nodiscard]] uint32_t readDWORDTag(Exiv2::BasicIo::UniquePtr& io);
 
-[[nodiscard]] uint16_t readWORDTag(Exiv2::BasicIo::UniquePtr& io) ;
+[[nodiscard]] uint16_t readWORDTag(Exiv2::BasicIo::UniquePtr& io);
 
-[[nodiscard]] std::string readStringWcharTag(Exiv2::BasicIo::UniquePtr& io, uint16_t length) ;
+[[nodiscard]] std::string readStringWcharTag(Exiv2::BasicIo::UniquePtr& io, uint16_t length);
 
-[[nodiscard]] std::string readStringTag(Exiv2::BasicIo::UniquePtr& io, uint16_t length=DWORD) ;
+[[nodiscard]] std::string readStringTag(Exiv2::BasicIo::UniquePtr& io, uint16_t length = DWORD);
 
 }  // namespace Exiv2
 #endif  // HELPER_FUNCTIONS_HPP
diff --git a/test/data/test_reference_files/flame.avi.out b/test/data/test_reference_files/flame.avi.out
index 56d76f1e..50991460 100644
--- a/test/data/test_reference_files/flame.avi.out
+++ b/test/data/test_reference_files/flame.avi.out
@@ -5,6 +5,7 @@ Xmp.video.FileType                           XmpText     4  AVI   AVI
 Xmp.video.MicroSecPerFrame                   XmpText     5  28571  28571
 Xmp.video.MaxDataRate                        XmpText     5  95326  95326
 Xmp.video.FrameCount                         XmpText     3  110  110
+Xmp.audio.ChannelType                        XmpText     4  Mono  Mono
 Xmp.video.StreamCount                        XmpText     4  3074  3074
 Xmp.video.Width                              XmpText     3  256  256
 Xmp.video.Height                             XmpText     3  240  240