diff --git a/include/exiv2/quicktimevideo.hpp b/include/exiv2/quicktimevideo.hpp
index a665178a..6d56749c 100644
--- a/include/exiv2/quicktimevideo.hpp
+++ b/include/exiv2/quicktimevideo.hpp
@@ -55,15 +55,23 @@ class QuickTimeVideo : public Image {
   QuickTimeVideo(BasicIo::UniquePtr io);
   //@}
 
+  //! @name NOT Implemented
+  //@{
+  //! Copy constructor
+  QuickTimeVideo(const QuickTimeVideo&) = delete;
+  //! Assignment operator
+  QuickTimeVideo& operator=(const QuickTimeVideo&) = delete;
+  //@}
+
   //! @name Manipulators
   //@{
-  void readMetadata();
-  void writeMetadata();
+  void readMetadata() override;
+  void writeMetadata() override;
   //@}
 
   //! @name Accessors
   //@{
-  std::string mimeType() const;
+  std::string mimeType() const override;
   //@}
 
  protected:
@@ -198,22 +206,13 @@ class QuickTimeVideo : public Image {
    */
   void aspectRatio();
 
- private:
-  //! @name NOT Implemented
-  //@{
-  //! Copy constructor
-  QuickTimeVideo(const QuickTimeVideo& rhs);
-  //! Assignment operator
-  QuickTimeVideo& operator=(const QuickTimeVideo& rhs);
-  //@}
-
  private:
   //! Variable which stores Time Scale unit, used to calculate time.
   uint64_t timeScale_ = 0;
   //! Variable which stores current stream being processsed.
   int currentStream_ = 0;
   //! Variable to check the end of metadata traversing.
-  bool continueTraversing_ = 0;
+  bool continueTraversing_ = false;
   //! Variable to store height and width of a video frame.
   uint64_t height_ = 0, width_ = 0;
 
diff --git a/src/easyaccess.cpp b/src/easyaccess.cpp
index 4ec18dee..af950a2e 100644
--- a/src/easyaccess.cpp
+++ b/src/easyaccess.cpp
@@ -238,12 +238,12 @@ ExifData::const_iterator lensName(const ExifData& ed) {
       "Exif.Sony1.LensID",          "Exif.Sony2.LensID",          "Exif.Sony1.LensSpec",   "Exif.Sony2.LensSpec",
       "Exif.OlympusEq.LensType",    "Exif.Panasonic.LensType",    "Exif.Samsung2.LensType"};
 
-  for (size_t i = 0; i < std::size(keys); ++i) {
-    Exiv2::ExifData::const_iterator pos = ed.findKey(ExifKey(keys[i]));
+  for (auto& key : keys) {
+    auto pos = ed.findKey(ExifKey(key));
     if (pos != ed.end()) {
       // Exif.NikonLd4.LensID and Exif.NikonLd4.LensIDNumber are usually together included,
       // one of them has value 0 (which means undefined), so skip tag with value 0
-      if (strncmp(keys[i], "Exif.NikonLd4", 13) == 0) {
+      if (strncmp(key, "Exif.NikonLd4", 13) == 0) {
         if (pos->getValue()->toInt64(0) > 0)
           return pos;
       } else
diff --git a/src/matroskavideo.cpp b/src/matroskavideo.cpp
index a51ccd29..68c2fda5 100644
--- a/src/matroskavideo.cpp
+++ b/src/matroskavideo.cpp
@@ -21,7 +21,7 @@
 // included header files
 #include "config.h"
 
-//#ifdef EXV_ENABLE_VIDEO
+// #ifdef EXV_ENABLE_VIDEO
 #include "basicio.hpp"
 #include "error.hpp"
 #include "futils.hpp"
@@ -30,16 +30,15 @@
 #include "tags_int.hpp"
 
 // + standard includes
-#include <stdlib.h>
 #include <array>
 #include <cassert>
 #include <cmath>
+#include <cstdlib>
 #include <iostream>
 #include <limits>
 // *****************************************************************************
 // class member definitions
-namespace Exiv2 {
-namespace Internal {
+namespace Exiv2::Internal {
 
 /*!
   Tag Look-up list for Matroska Type Video Files
@@ -570,8 +569,7 @@ const std::array<MatroskaTag, 2> streamRate = {MatroskaTag(0x1, "Xmp.video.Frame
   return true;
 }
 
-}  // namespace Internal
-}  // namespace Exiv2
+}  // namespace Exiv2::Internal
 
 namespace Exiv2 {
 
@@ -847,7 +845,7 @@ void MatroskaVideo::decodeDateTags(const MatroskaTag* tag, const byte* buf, size
     case TimecodeScale:
       if (!convertToUint64(buf, size, value))
         return;
-      time_code_scale_ = (double)value / (double)1000000000;
+      time_code_scale_ = static_cast<double>(value) / static_cast<double>(1000000000);
       xmpData_[tag->_label] = time_code_scale_;
       break;
     default:
@@ -873,7 +871,7 @@ void MatroskaVideo::decodeFloatTags(const MatroskaTag* tag, const byte* buf, siz
       if (internalMt) {
         switch (stream_) {
           case 1:  // video
-            frame_rate = (double)1000000000 / (double)key;
+            frame_rate = static_cast<double>(1000000000) / static_cast<double>(key);
             break;
           case 2:  // audio
             frame_rate = static_cast<double>(key / 1000);
@@ -893,11 +891,11 @@ void MatroskaVideo::decodeFloatTags(const MatroskaTag* tag, const byte* buf, siz
 }
 
 void MatroskaVideo::aspectRatio() {
-  double aspectRatio = (double)width_ / (double)height_;
+  double aspectRatio = static_cast<double>(width_) / static_cast<double>(height_);
   aspectRatio = floor(aspectRatio * 10) / 10;
   xmpData_["Xmp.video.AspectRatio"] = aspectRatio;
 
-  int aR = (int)((aspectRatio * 10.0) + 0.1);
+  auto aR = static_cast<int>((aspectRatio * 10.0) + 0.1);
 
   switch (aR) {
     case 13:
@@ -930,22 +928,21 @@ void MatroskaVideo::aspectRatio() {
 uint32_t MatroskaVideo::findBlockSize(byte b) {
   if (b & 128)
     return 1;
-  else if (b & 64)
+  if (b & 64)
     return 2;
-  else if (b & 32)
+  if (b & 32)
     return 3;
-  else if (b & 16)
+  if (b & 16)
     return 4;
-  else if (b & 8)
+  if (b & 8)
     return 5;
-  else if (b & 4)
+  if (b & 4)
     return 6;
-  else if (b & 2)
+  if (b & 2)
     return 7;
-  else if (b & 1)
+  if (b & 1)
     return 8;
-  else
-    return 0;
+  return 0;
 }
 
 Image::UniquePtr newMkvInstance(BasicIo::UniquePtr io, bool /*create*/) {
@@ -973,4 +970,4 @@ bool isMkvType(BasicIo& iIo, bool advance) {
   return result;
 }
 
-}  // namespace Exiv2
\ No newline at end of file
+}  // namespace Exiv2
diff --git a/src/nikonmn_int.cpp b/src/nikonmn_int.cpp
index 1d16ace8..9aacdae9 100644
--- a/src/nikonmn_int.cpp
+++ b/src/nikonmn_int.cpp
@@ -994,9 +994,9 @@ static void printFlashCompensationValue(std::ostream& os, const unsigned char va
     float output = 0.0;
     if (value < 128) {
       if (value != 0)
-        output = float(value) * float(-1.0);
+        output = static_cast<float>(value) * static_cast<float>(-1.0);
     } else {
-      output = float(256.0) - float(value);
+      output = static_cast<float>(256.0) - static_cast<float>(value);
     }
     os.precision(1);
     if (value != 0)
diff --git a/src/quicktimevideo.cpp b/src/quicktimevideo.cpp
index 00db1fc1..883e03c6 100644
--- a/src/quicktimevideo.cpp
+++ b/src/quicktimevideo.cpp
@@ -36,8 +36,7 @@
 #include <string>
 // *****************************************************************************
 // class member definitions
-namespace Exiv2 {
-namespace Internal {
+namespace Exiv2::Internal {
 
 extern const TagVocabulary qTimeFileType[] = {
     {"3g2a", "3GPP2 Media (.3G2) compliant with 3GPP2 C.S0050-0 V1.0"},
@@ -465,8 +464,8 @@ bool ignoreList(Exiv2::DataBuf& buf) {
       "mdat", "edts", "junk", "iods", "alis", "stsc", "stsz", "stco", "ctts", "stss", "skip", "wide", "cmvd",
   };
 
-  for (int i = 0; i < 13; ++i)
-    if (equalsQTimeTag(buf, ignoreList[i]))
+  for (auto i : ignoreList)
+    if (equalsQTimeTag(buf, i))
       return true;
 
   return false;
@@ -484,14 +483,13 @@ bool dataIgnoreList(Exiv2::DataBuf& buf) {
       "moov", "mdia", "minf", "dinf", "alis", "stbl", "cmov", "meta",
   };
 
-  for (int i = 0; i < 8; ++i)
-    if (equalsQTimeTag(buf, ignoreList[i]))
+  for (auto i : ignoreList)
+    if (equalsQTimeTag(buf, i))
       return true;
 
   return false;
 }
-}  // namespace Internal
-}  // namespace Exiv2
+}  // namespace Exiv2::Internal
 
 namespace Exiv2 {
 
@@ -524,7 +522,7 @@ void QuickTimeVideo::readMetadata() {
   continueTraversing_ = true;
   height_ = width_ = 1;
 
-  xmpData_["Xmp.video.FileSize"] = (double)io_->size() / (double)1048576;
+  xmpData_["Xmp.video.FileSize"] = static_cast<double>(io_->size()) / static_cast<double>(1048576);
   xmpData_["Xmp.video.MimeType"] = mimeType();
 
   while (continueTraversing_)
@@ -570,7 +568,7 @@ void QuickTimeVideo::decodeBlock(std::string const& entered_from) {
   enforce(size - hdrsize <= std::numeric_limits<size_t>::max(), Exiv2::ErrorCode::kerCorruptedMetadata);
 
   // std::cerr<<"Tag=>"<<buf.data()<<"     size=>"<<size-hdrsize << std::endl;
-  const size_t newsize = static_cast<size_t>(size - hdrsize);
+  const auto newsize = static_cast<size_t>(size - hdrsize);
   if (newsize > buf.size()) {
     buf.resize(newsize);
   }
@@ -765,14 +763,16 @@ void QuickTimeVideo::CameraTagsDecoder(size_t size_external) {
     io_->readOrThrow(buf.data(), 14);
     xmpData_["Xmp.video.Model"] = Exiv2::toString(buf.data());
     io_->readOrThrow(buf.data(), 4);
-    xmpData_["Xmp.video.ExposureTime"] = "1/" + Exiv2::toString(ceil(buf.read_uint32(0, littleEndian) / (double)10));
+    xmpData_["Xmp.video.ExposureTime"] =
+        "1/" + Exiv2::toString(ceil(buf.read_uint32(0, littleEndian) / static_cast<double>(10)));
     io_->readOrThrow(buf.data(), 4);
     io_->readOrThrow(buf2.data(), 4);
-    xmpData_["Xmp.video.FNumber"] = buf.read_uint32(0, littleEndian) / (double)buf2.read_uint32(0, littleEndian);
+    xmpData_["Xmp.video.FNumber"] =
+        buf.read_uint32(0, littleEndian) / static_cast<double>(buf2.read_uint32(0, littleEndian));
     io_->readOrThrow(buf.data(), 4);
     io_->readOrThrow(buf2.data(), 4);
     xmpData_["Xmp.video.ExposureCompensation"] =
-        buf.read_uint32(0, littleEndian) / (double)buf2.read_uint32(0, littleEndian);
+        buf.read_uint32(0, littleEndian) / static_cast<double>(buf2.read_uint32(0, littleEndian));
     io_->readOrThrow(buf.data(), 10);
     io_->readOrThrow(buf.data(), 4);
     td = find(whiteBalance, buf.read_uint32(0, littleEndian));
@@ -780,7 +780,8 @@ void QuickTimeVideo::CameraTagsDecoder(size_t size_external) {
       xmpData_["Xmp.video.WhiteBalance"] = exvGettext(td->label_);
     io_->readOrThrow(buf.data(), 4);
     io_->readOrThrow(buf2.data(), 4);
-    xmpData_["Xmp.video.FocalLength"] = buf.read_uint32(0, littleEndian) / (double)buf2.read_uint32(0, littleEndian);
+    xmpData_["Xmp.video.FocalLength"] =
+        buf.read_uint32(0, littleEndian) / static_cast<double>(buf2.read_uint32(0, littleEndian));
     io_->seek(static_cast<long>(95), BasicIo::cur);
     io_->readOrThrow(buf.data(), 48);
     buf.write_uint8(48, 0);
@@ -820,7 +821,7 @@ void QuickTimeVideo::userDataDecoder(size_t size_external) {
     if (size <= 12)
       break;
 
-    else if (equalsQTimeTag(buf, "DcMD") || equalsQTimeTag(buf, "NCDT"))
+    if (equalsQTimeTag(buf, "DcMD") || equalsQTimeTag(buf, "NCDT"))
       userDataDecoder(size - 8);
 
     else if (equalsQTimeTag(buf, "NCTG"))
@@ -892,64 +893,64 @@ void QuickTimeVideo::NikonTagsDecoder(size_t size_external) {
       std::memset(buf.data(), 0x0, buf.size());
 
       io_->readOrThrow(buf.data(), 1);
-      td2 = find(PictureControlAdjust, (int)buf.data()[0] & 7);
+      td2 = find(PictureControlAdjust, static_cast<int>(buf.data()[0]) & 7);
       if (td2)
         xmpData_["Xmp.video.PictureControlAdjust"] = exvGettext(td2->label_);
       else
-        xmpData_["Xmp.video.PictureControlAdjust"] = (int)buf.data()[0] & 7;
+        xmpData_["Xmp.video.PictureControlAdjust"] = static_cast<int>(buf.data()[0]) & 7;
 
       io_->readOrThrow(buf.data(), 1);
-      td2 = find(NormalSoftHard, (int)buf.data()[0] & 7);
+      td2 = find(NormalSoftHard, static_cast<int>(buf.data()[0]) & 7);
       if (td2)
         xmpData_["Xmp.video.PictureControlQuickAdjust"] = exvGettext(td2->label_);
 
       io_->readOrThrow(buf.data(), 1);
-      td2 = find(NormalSoftHard, (int)buf.data()[0] & 7);
+      td2 = find(NormalSoftHard, static_cast<int>(buf.data()[0]) & 7);
       if (td2)
         xmpData_["Xmp.video.Sharpness"] = exvGettext(td2->label_);
       else
-        xmpData_["Xmp.video.Sharpness"] = (int)buf.data()[0] & 7;
+        xmpData_["Xmp.video.Sharpness"] = static_cast<int>(buf.data()[0]) & 7;
 
       io_->readOrThrow(buf.data(), 1);
-      td2 = find(NormalSoftHard, (int)buf.data()[0] & 7);
+      td2 = find(NormalSoftHard, static_cast<int>(buf.data()[0]) & 7);
       if (td2)
         xmpData_["Xmp.video.Contrast"] = exvGettext(td2->label_);
       else
-        xmpData_["Xmp.video.Contrast"] = (int)buf.data()[0] & 7;
+        xmpData_["Xmp.video.Contrast"] = static_cast<int>(buf.data()[0]) & 7;
 
       io_->readOrThrow(buf.data(), 1);
-      td2 = find(NormalSoftHard, (int)buf.data()[0] & 7);
+      td2 = find(NormalSoftHard, static_cast<int>(buf.data()[0]) & 7);
       if (td2)
         xmpData_["Xmp.video.Brightness"] = exvGettext(td2->label_);
       else
-        xmpData_["Xmp.video.Brightness"] = (int)buf.data()[0] & 7;
+        xmpData_["Xmp.video.Brightness"] = static_cast<int>(buf.data()[0]) & 7;
 
       io_->readOrThrow(buf.data(), 1);
-      td2 = find(Saturation, (int)buf.data()[0] & 7);
+      td2 = find(Saturation, static_cast<int>(buf.data()[0]) & 7);
       if (td2)
         xmpData_["Xmp.video.Saturation"] = exvGettext(td2->label_);
       else
-        xmpData_["Xmp.video.Saturation"] = (int)buf.data()[0] & 7;
+        xmpData_["Xmp.video.Saturation"] = static_cast<int>(buf.data()[0]) & 7;
 
       io_->readOrThrow(buf.data(), 1);
-      xmpData_["Xmp.video.HueAdjustment"] = (int)buf.data()[0] & 7;
+      xmpData_["Xmp.video.HueAdjustment"] = static_cast<int>(buf.data()[0]) & 7;
 
       io_->readOrThrow(buf.data(), 1);
-      td2 = find(FilterEffect, (int)buf.data()[0]);
+      td2 = find(FilterEffect, static_cast<int>(buf.data()[0]));
       if (td2)
         xmpData_["Xmp.video.FilterEffect"] = exvGettext(td2->label_);
       else
-        xmpData_["Xmp.video.FilterEffect"] = (int)buf.data()[0];
+        xmpData_["Xmp.video.FilterEffect"] = static_cast<int>(buf.data()[0]);
 
       io_->readOrThrow(buf.data(), 1);
-      td2 = find(ToningEffect, (int)buf.data()[0]);
+      td2 = find(ToningEffect, static_cast<int>(buf.data()[0]));
       if (td2)
         xmpData_["Xmp.video.ToningEffect"] = exvGettext(td2->label_);
       else
-        xmpData_["Xmp.video.ToningEffect"] = (int)buf.data()[0];
+        xmpData_["Xmp.video.ToningEffect"] = static_cast<int>(buf.data()[0]);
 
       io_->readOrThrow(buf.data(), 1);
-      xmpData_["Xmp.video.ToningSaturation"] = (int)buf.data()[0];
+      xmpData_["Xmp.video.ToningSaturation"] = static_cast<int>(buf.data()[0]);
 
       io_->seek(local_pos + dataLength, BasicIo::beg);
     }
@@ -962,12 +963,12 @@ void QuickTimeVideo::NikonTagsDecoder(size_t size_external) {
       io_->readOrThrow(buf.data(), 2);
       xmpData_["Xmp.video.TimeZone"] = Exiv2::getShort(buf.data(), bigEndian);
       io_->readOrThrow(buf.data(), 1);
-      td2 = find(YesNo, (int)buf.data()[0]);
+      td2 = find(YesNo, static_cast<int>(buf.data()[0]));
       if (td2)
         xmpData_["Xmp.video.DayLightSavings"] = exvGettext(td2->label_);
 
       io_->readOrThrow(buf.data(), 1);
-      td2 = find(DateDisplayFormat, (int)buf.data()[0]);
+      td2 = find(DateDisplayFormat, static_cast<int>(buf.data()[0]));
       if (td2)
         xmpData_["Xmp.video.DateDisplayFormat"] = exvGettext(td2->label_);
 
@@ -1030,8 +1031,8 @@ void QuickTimeVideo::NikonTagsDecoder(size_t size_external) {
       io_->readOrThrow(buf.data(), 4);
       io_->readOrThrow(buf2.data(), 4);
       if (td)
-        xmpData_[exvGettext(td->label_)] =
-            Exiv2::toString((double)buf.read_uint32(0, bigEndian) / (double)buf2.read_uint32(0, bigEndian));
+        xmpData_[exvGettext(td->label_)] = Exiv2::toString(static_cast<double>(buf.read_uint32(0, bigEndian)) /
+                                                           static_cast<double>(buf2.read_uint32(0, bigEndian)));
 
       // Sanity check with an "unreasonably" large number
       if (dataLength > 200 || dataLength < 8) {
@@ -1107,7 +1108,8 @@ void QuickTimeVideo::timeToSampleDecoder() {
     timeOfFrames = Safe::add(timeOfFrames, temp * buf.read_uint32(0, bigEndian));
   }
   if (currentStream_ == Video)
-    xmpData_["Xmp.video.FrameRate"] = (double)totalframes * (double)timeScale_ / (double)timeOfFrames;
+    xmpData_["Xmp.video.FrameRate"] =
+        static_cast<double>(totalframes) * static_cast<double>(timeScale_) / static_cast<double>(timeOfFrames);
 }  // QuickTimeVideo::timeToSampleDecoder
 
 void QuickTimeVideo::sampleDesc(size_t size) {
@@ -1537,11 +1539,11 @@ void QuickTimeVideo::movieHeaderDecoder(size_t size) {
 void QuickTimeVideo::aspectRatio() {
   // TODO - Make a better unified method to handle all cases of Aspect Ratio
 
-  double aspectRatio = (double)width_ / (double)height_;
+  double aspectRatio = static_cast<double>(width_) / static_cast<double>(height_);
   aspectRatio = floor(aspectRatio * 10) / 10;
   xmpData_["Xmp.video.AspectRatio"] = aspectRatio;
 
-  int aR = (int)((aspectRatio * 10.0) + 0.1);
+  auto aR = static_cast<int>((aspectRatio * 10.0) + 0.1);
 
   switch (aR) {
     case 13:
diff --git a/src/sonymn_int.cpp b/src/sonymn_int.cpp
index c2a5c32c..99c4c005 100644
--- a/src/sonymn_int.cpp
+++ b/src/sonymn_int.cpp
@@ -1034,8 +1034,8 @@ std::ostream& SonyMakerNote::printWBShiftABGMPrecise(std::ostream& os, const Val
   }
   std::ios::fmtflags f(os.flags());
 
-  const auto temp0 = static_cast<double>(value.toInt64(0)) / double(1000.0);
-  const auto temp1 = static_cast<double>(value.toInt64(1)) / double(1000.0);
+  const auto temp0 = static_cast<double>(value.toInt64(0)) / (1000.0);
+  const auto temp1 = static_cast<double>(value.toInt64(1)) / (1000.0);
 
   os << "A/B: ";
   if (temp0 == 0) {
@@ -1067,7 +1067,7 @@ std::ostream& SonyMakerNote::printExposureStandardAdjustment(std::ostream& os, c
   std::ios::fmtflags f(os.flags());
 
   const auto [r, s] = value.toRational();
-  os << std::fixed << std::setprecision(1) << (double(r) / double(s));
+  os << std::fixed << std::setprecision(1) << (static_cast<double>(r) / static_cast<double>(s));
   os.flags(f);
 
   return os;
diff --git a/src/tags_int.hpp b/src/tags_int.hpp
index 05877edd..5eaa1afe 100644
--- a/src/tags_int.hpp
+++ b/src/tags_int.hpp
@@ -51,7 +51,7 @@ struct StringTagDetails {
   bool operator==(const char* key) const {
     return (strcmp(val_, key) == 0);
   }
-  bool operator==(const std::string key) const {
+  bool operator==(const std::string& key) const {
     return (key == val_);
   }
 };  // struct TagDetails