diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1f2b4f9..2a23941 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -182,7 +182,7 @@ set(DOC_FILES README.md doc/adding-new-fields.md)
 set(CONFIGURATION_PACKAGE_SUFFIX
     ""
     CACHE STRING "sets the suffix for find_package() calls to packages configured via c++utilities")
-find_package(c++utilities${CONFIGURATION_PACKAGE_SUFFIX} 5.0.0 REQUIRED)
+find_package(c++utilities${CONFIGURATION_PACKAGE_SUFFIX} 5.10.0 REQUIRED)
 use_cpp_utilities(VISIBILITY PUBLIC)
 
 # find 3rd party libraries
diff --git a/abstracttrack.cpp b/abstracttrack.cpp
index edc86ce..23aaf8f 100644
--- a/abstracttrack.cpp
+++ b/abstracttrack.cpp
@@ -34,7 +34,7 @@ AbstractTrack::AbstractTrack(istream &inputStream, ostream &outputStream, std::u
     , m_reader(BinaryReader(&inputStream))
     , m_writer(BinaryWriter(&outputStream))
     , m_startOffset(startOffset)
-    , m_headerValid(false)
+    , m_flags(TrackFlags::Enabled | TrackFlags::UsedInPresentation | TrackFlags::UsedWhenPreviewing)
     , m_format()
     , m_mediaType(MediaType::Unknown)
     , m_version(0.0)
@@ -55,15 +55,7 @@ AbstractTrack::AbstractTrack(istream &inputStream, ostream &outputStream, std::u
     , m_depth(0)
     , m_fps(0)
     , m_chromaFormat(nullptr)
-    , m_interlaced(false)
     , m_timeScale(0)
-    , m_enabled(true)
-    , m_default(false)
-    , m_forced(false)
-    , m_lacing(false)
-    , m_encrypted(false)
-    , m_usedInPresentation(true)
-    , m_usedWhenPreviewing(true)
     , m_colorSpace(0)
 {
 }
@@ -244,12 +236,12 @@ string AbstractTrack::shortDescription() const
  */
 void AbstractTrack::parseHeader(Diagnostics &diag)
 {
-    m_headerValid = false;
+    m_flags -= TrackFlags::HeaderValid;
     m_istream->seekg(static_cast<streamoff>(m_startOffset), ios_base::beg);
     try {
         internalParseHeader(diag);
-        m_headerValid = true;
-    } catch (Failure &) {
+        m_flags += TrackFlags::HeaderValid;
+    } catch (const Failure &) {
         throw;
     }
 }
diff --git a/abstracttrack.h b/abstracttrack.h
index d1e1e6f..b461d14 100644
--- a/abstracttrack.h
+++ b/abstracttrack.h
@@ -11,6 +11,7 @@
 #include <c++utilities/chrono/timespan.h>
 #include <c++utilities/io/binaryreader.h>
 #include <c++utilities/io/binarywriter.h>
+#include <c++utilities/misc/flagenumclass.h>
 
 #include <iosfwd>
 #include <string>
@@ -36,6 +37,28 @@ enum class TrackType {
     IvfStream, /**< The track is a TagParser::IvfStream. */
 };
 
+/*!
+ * \brief The TrackFlags enum specifies miscellaneous boolean properties of a track.
+ */
+enum class TrackFlags : std::uint64_t {
+    None = 0, /**< No flags present */
+    HeaderValid = (1 << 0), /**< The track header is valid. Set by AbstractTrack::parseHeader() on success. */
+    Enabled = (1 << 2), /**< The track is marked as enabled. */
+    Default = (1 << 3), /**< The track is marked as default. */
+    Forced = (1 << 4), /**< The track is marked as forced. */
+    Lacing = (1 << 5), /**< The track has lacing. */
+    Encrypted = (1 << 6), /**< The track is encrypted. */
+    UsedInPresentation = (1 << 7), /**< The track is supposed to be used in presentation. */
+    UsedWhenPreviewing = (1 << 8), /**< The track is supposed to be used when previewing. */
+    Interlaced = (1 << 9), /**< The video is interlaced. */
+};
+
+} // namespace TagParser
+
+CPP_UTILITIES_MARK_FLAG_ENUM_CLASS(TagParser, TagParser::TrackFlags)
+
+namespace TagParser {
+
 class TAG_PARSER_EXPORT AbstractTrack {
     friend class MpegAudioFrameStream;
     friend class WaveAudioStream;
@@ -52,6 +75,7 @@ public:
     CppUtilities::BinaryReader &reader();
     CppUtilities::BinaryWriter &writer();
     std::uint64_t startOffset() const;
+    TrackFlags flags() const;
     MediaFormat format() const;
     double version() const;
     const char *formatName() const;
@@ -121,7 +145,7 @@ protected:
     CppUtilities::BinaryReader m_reader;
     CppUtilities::BinaryWriter m_writer;
     std::uint64_t m_startOffset;
-    bool m_headerValid;
+    TrackFlags m_flags;
     MediaFormat m_format;
     std::string m_formatId;
     std::string m_formatName;
@@ -155,15 +179,7 @@ protected:
     std::uint32_t m_fps;
     const char *m_chromaFormat;
     AspectRatio m_pixelAspectRatio;
-    bool m_interlaced;
     std::uint32_t m_timeScale;
-    bool m_enabled;
-    bool m_default;
-    bool m_forced;
-    bool m_lacing;
-    bool m_encrypted;
-    bool m_usedInPresentation;
-    bool m_usedWhenPreviewing;
     std::uint32_t m_colorSpace;
     Margin m_cropping;
 
@@ -247,6 +263,15 @@ inline std::uint64_t AbstractTrack::startOffset() const
     return m_startOffset;
 }
 
+/*!
+ * \brief Returns flags (various boolean properties) of this track.
+ * \sa TrackFlags
+ */
+inline TrackFlags AbstractTrack::flags() const
+{
+    return m_flags;
+}
+
 /*!
  * \brief Returns the format of the track if known; otherwise returns MediaFormat::Unknown.
  */
@@ -576,13 +601,13 @@ inline const AspectRatio &AbstractTrack::pixelAspectRatio() const
 }
 
 /*!
- * \brief Returns true if the video is denoted as interlaced; otherwise returns false.
+ * \brief Returns true if the video is interlaced; otherwise returns false.
  *
  * This value only makes sense for video tracks.
  */
 inline bool AbstractTrack::isInterlaced() const
 {
-    return m_interlaced;
+    return m_flags & TrackFlags::Interlaced;
 }
 
 /*!
diff --git a/matroska/matroskatrack.cpp b/matroska/matroskatrack.cpp
index 50bbc07..2d07104 100644
--- a/matroska/matroskatrack.cpp
+++ b/matroska/matroskatrack.cpp
@@ -361,7 +361,7 @@ void MatroskaTrack::internalParseHeader(Diagnostics &diag)
                     m_fps = subElement->readFloat();
                     break;
                 case MatroskaIds::FlagInterlaced:
-                    m_interlaced = subElement->readUInteger();
+                    modFlagEnum(m_flags, TrackFlags::Interlaced, subElement->readUInteger());
                     break;
                 case MatroskaIds::ColorSpace:
                     m_colorSpace = subElement->readUInteger();
@@ -424,16 +424,16 @@ void MatroskaTrack::internalParseHeader(Diagnostics &diag)
         case MatroskaIds::CodecDelay:
             break; // TODO
         case MatroskaIds::TrackFlagEnabled:
-            m_enabled = trackInfoElement->readUInteger();
+            modFlagEnum(m_flags, TrackFlags::Enabled, trackInfoElement->readUInteger());
             break;
         case MatroskaIds::TrackFlagDefault:
-            m_default = trackInfoElement->readUInteger();
+            modFlagEnum(m_flags, TrackFlags::Default, trackInfoElement->readUInteger());
             break;
         case MatroskaIds::TrackFlagForced:
-            m_forced = trackInfoElement->readUInteger();
+            modFlagEnum(m_flags, TrackFlags::Forced, trackInfoElement->readUInteger());
             break;
         case MatroskaIds::TrackFlagLacing:
-            m_lacing = trackInfoElement->readUInteger();
+            modFlagEnum(m_flags, TrackFlags::Lacing, trackInfoElement->readUInteger());
             break;
         case MatroskaIds::DefaultDuration:
             defaultDuration = trackInfoElement->readUInteger();
diff --git a/mp4/mp4tagfield.cpp b/mp4/mp4tagfield.cpp
index b03fdd3..218d061 100644
--- a/mp4/mp4tagfield.cpp
+++ b/mp4/mp4tagfield.cpp
@@ -111,8 +111,8 @@ void Mp4TagField::reparse(Mp4Atom &ilstChild, Diagnostics &diag)
                 } catch (const Failure &) {
                     // tag id is unknown, it is not possible to validate parsed data type
                 }
-                m_countryIndicator = reader.readUInt16BE();
-                m_langIndicator = reader.readUInt16BE();
+                m_countryIndicator = reader.readUInt16BE(); // FIXME: use locale within the tag value
+                m_langIndicator = reader.readUInt16BE(); // FIXME: use locale within the tag value
                 switch (m_parsedRawDataType) {
                 case RawDataType::Utf8:
                 case RawDataType::Utf16:
@@ -596,8 +596,8 @@ void Mp4TagFieldMaker::make(ostream &stream)
         m_writer.writeUInt32BE(Mp4AtomIds::Data); // id of data atom
         m_writer.writeByte(0); // version
         m_writer.writeUInt24BE(m_rawDataType);
-        m_writer.writeUInt16BE(m_field.countryIndicator());
-        m_writer.writeUInt16BE(m_field.languageIndicator());
+        m_writer.writeUInt16BE(m_field.countryIndicator()); // FIXME: use locale within the tag value
+        m_writer.writeUInt16BE(m_field.languageIndicator()); // FIXME: use locale within the tag value
         if (m_convertedData.tellp()) {
             // write converted data
             stream << m_convertedData.rdbuf();
diff --git a/mp4/mp4track.cpp b/mp4/mp4track.cpp
index 5455266..826b323 100644
--- a/mp4/mp4track.cpp
+++ b/mp4/mp4track.cpp
@@ -1203,13 +1203,13 @@ void Mp4Track::makeTrackHeader(Diagnostics &diag)
     // make version and flags
     writer().writeByte(version);
     std::uint32_t flags = 0;
-    if (m_enabled) {
+    if (isEnabled()) {
         flags |= 0x000001;
     }
-    if (m_usedInPresentation) {
+    if (m_flags & TrackFlags::UsedInPresentation) {
         flags |= 0x000002;
     }
-    if (m_usedWhenPreviewing) {
+    if (m_flags & TrackFlags::UsedWhenPreviewing) {
         flags |= 0x000004;
     }
     writer().writeUInt24BE(flags);
@@ -1533,9 +1533,9 @@ void Mp4Track::internalParseHeader(Diagnostics &diag)
     m_istream->seekg(static_cast<streamoff>(m_tkhdAtom->startOffset() + 8)); // seek to beg, skip size and name
     auto atomVersion = reader.readByte(); // read version
     const auto flags = reader.readUInt24BE();
-    m_enabled = flags & 0x000001;
-    m_usedInPresentation = flags & 0x000002;
-    m_usedWhenPreviewing = flags & 0x000004;
+    modFlagEnum(m_flags, TrackFlags::Enabled, flags & 0x000001);
+    modFlagEnum(m_flags, TrackFlags::UsedInPresentation, flags & 0x000002);
+    modFlagEnum(m_flags, TrackFlags::UsedWhenPreviewing, flags & 0x000004);
     switch (atomVersion) {
     case 0:
         m_creationTime = startDate + TimeSpan::fromSeconds(reader.readUInt32BE());
diff --git a/ogg/oggstream.cpp b/ogg/oggstream.cpp
index e9b1c39..b7a06b3 100644
--- a/ogg/oggstream.cpp
+++ b/ogg/oggstream.cpp
@@ -283,7 +283,6 @@ void OggStream::internalParseHeader(Diagnostics &diag)
         // calculate duration from stream size and bitrate, assuming 1 % overhead
         m_duration = TimeSpan::fromSeconds(static_cast<double>(m_size) / (m_bitrate * 125.0) * 1.1);
     }
-    m_headerValid = true;
 }
 
 void OggStream::calculateDurationViaSampleCount(std::uint16_t preSkip)
diff --git a/tagvalue.h b/tagvalue.h
index c73a791..b633685 100644
--- a/tagvalue.h
+++ b/tagvalue.h
@@ -667,7 +667,7 @@ inline bool TagValue::isLabeledAsReadonly() const
  */
 inline void TagValue::setReadonly(bool readOnly)
 {
-    readOnly ? (m_flags += TagValueFlags::ReadOnly) : (m_flags -= TagValueFlags::ReadOnly);
+    CppUtilities::modFlagEnum(m_flags, TagValueFlags::ReadOnly, readOnly);
 }
 
 /*!