diff --git a/mythtv/libs/libmyth/netutils.cpp b/mythtv/libs/libmyth/netutils.cpp
@@ -327,12 +327,12 @@ bool markTreeUpdated(GrabberScript* script, const QDateTime& curTime)
     return (query.numRowsAffected() > 0);
 }
 
-bool needsUpdate(GrabberScript* script, uint updateFreq)
+bool needsUpdate(GrabberScript* script, std::chrono::hours updateFreq)
 {
     QDateTime now = MythDate::current();
     QDateTime then = lastUpdate(script);
 
-    return then.addSecs(updateFreq * 60 * 60) < now;
+    return then.addSecs(duration_cast<std::chrono::seconds>(updateFreq).count()) < now;
 }
 
 QDateTime lastUpdate(GrabberScript* script)

diff --git a/mythtv/libs/libmyth/netutils.h b/mythtv/libs/libmyth/netutils.h
@@ -21,7 +21,7 @@ MPUBLIC bool findSearchGrabberInDB(const QString &commandline, ArticleType type)
 MPUBLIC GrabberScript* findSearchGrabberByCommand(const QString &url, ArticleType type);
 MPUBLIC GrabberScript::scriptList findAllDBSearchGrabbers(ArticleType type);
 MPUBLIC bool markTreeUpdated(GrabberScript *script, const QDateTime& curTime);
-MPUBLIC bool needsUpdate(GrabberScript *script, uint updateFreq);
+MPUBLIC bool needsUpdate(GrabberScript *script, std::chrono::hours updateFreq);
 MPUBLIC QDateTime lastUpdate(GrabberScript* script);
 
 MPUBLIC bool clearTreeItems(const QString &feedcommand);

diff --git a/mythtv/libs/libmyth/output.cpp b/mythtv/libs/libmyth/output.cpp
@@ -47,15 +47,16 @@ void OutputListeners::removeVisual(MythTV::Visual *v)
 }
 
 void OutputListeners::dispatchVisual(uchar *buffer, unsigned long b_len,
-                        unsigned long written, int chan, int prec)
+                                     std::chrono::milliseconds timecode,
+                                     int chan, int prec)
 {
     if (! buffer)
        return;
 
     for (auto & visual : m_visuals)
     {
         QMutexLocker locker(visual->mutex());
-        visual->add(buffer, b_len, written, chan, prec);
+        visual->add(buffer, b_len, timecode, chan, prec);
     }
 }
 

diff --git a/mythtv/libs/libmyth/output.h b/mythtv/libs/libmyth/output.h
@@ -113,7 +113,7 @@ class MPUBLIC OutputListeners : public MythObservable
 protected:
     void error(const QString &e);
     void dispatchVisual(uchar *b, unsigned long b_len,
-                       unsigned long written, int chan, int prec);
+                        std::chrono::milliseconds timecode, int chan, int prec);
     void prepareVisuals();
 
 private:

diff --git a/mythtv/libs/libmyth/visual.h b/mythtv/libs/libmyth/visual.h
@@ -19,7 +19,8 @@ class Visual
     Visual() { ; }
     virtual ~Visual() { ; }
 
-    virtual void add(const void *b, unsigned long b_len, unsigned long w, int c, int p) = 0;
+    virtual void add(const void *b, unsigned long b_len,
+                     std::chrono::milliseconds timecode, int c, int p) = 0;
     virtual void prepare() = 0;
 
     QMutex *mutex() { return &m_mtx; }

diff --git a/mythtv/libs/libmythtv/deletemap.cpp b/mythtv/libs/libmythtv/deletemap.cpp
@@ -217,7 +217,7 @@ void DeleteMap::UpdateOSD(uint64_t frame, double frame_rate, OSD *osd)
     m_cachedTotalForOSD = total;
 }
 
-void DeleteMap::UpdateOSD(int64_t timecode, OSD *osd)
+void DeleteMap::UpdateOSD(std::chrono::milliseconds timecode, OSD *osd)
 {
     osd->SetGraph(OSD_WIN_PROGEDIT, "audiograph", timecode);
 }

diff --git a/mythtv/libs/libmythtv/deletemap.h b/mythtv/libs/libmythtv/deletemap.h
@@ -35,7 +35,7 @@ class MTV_PUBLIC DeleteMap
     void SetSeekAmount(float amount) { m_seekamount = amount; }
 
     void UpdateOSD(uint64_t frame, double frame_rate, OSD *osd);
-    static void UpdateOSD(int64_t timecode, OSD *osd);
+    static void UpdateOSD(std::chrono::milliseconds timecode, OSD *osd);
 
     bool IsEditing(void) const { return m_editing; }
     void SetEditing(bool edit, OSD *osd = nullptr);

diff --git a/mythtv/libs/libmythtv/mythplayerui.cpp b/mythtv/libs/libmythtv/mythplayerui.cpp
@@ -563,7 +563,7 @@ void MythPlayerUI::RefreshPauseFrame()
             if (m_deleteMap.IsEditing())
             {
                 m_osdLock.lock();
-                DeleteMap::UpdateOSD(m_latestVideoTimecode, &m_osd);
+                DeleteMap::UpdateOSD(std::chrono::milliseconds(m_latestVideoTimecode), &m_osd);
                 m_osdLock.unlock();
             }
         }

diff --git a/mythtv/libs/libmythtv/osd.cpp b/mythtv/libs/libmythtv/osd.cpp
@@ -432,7 +432,7 @@ void OSD::SetRegions(const QString &Window, frm_dir_map_t &Map, long long Total)
     bar->Display();
 }
 
-void OSD::SetGraph(const QString &Window, const QString &Graph, int64_t Timecode)
+void OSD::SetGraph(const QString &Window, const QString &Graph, std::chrono::milliseconds Timecode)
 {
     MythScreenType *win = GetWindow(Window);
     if (!win)

diff --git a/mythtv/libs/libmythtv/osd.h b/mythtv/libs/libmythtv/osd.h
@@ -122,7 +122,7 @@ class OSD : public MythMediaOverlay
     void SetValues(const QString &Window, const QHash<QString,int> &Map, OSDTimeout Timeout);
     void SetValues(const QString &Window, const QHash<QString,float> &Map, OSDTimeout Timeout);
     void SetRegions(const QString &Window, frm_dir_map_t &Map, long long Total);
-    void SetGraph(const QString &Window, const QString &Graph, int64_t Timecode);
+    void SetGraph(const QString &Window, const QString &Graph, std::chrono::milliseconds Timecode);
     bool IsWindowVisible(const QString &Window);
 
     bool DialogVisible(const QString& Window = QString());

diff --git a/mythtv/libs/libmythtv/visualisations/videovisual.cpp b/mythtv/libs/libmythtv/visualisations/videovisual.cpp
@@ -54,10 +54,10 @@ VideoVisual::~VideoVisual()
     mutex()->unlock();
 }
 
-int64_t VideoVisual::SetLastUpdate(void)
+std::chrono::milliseconds VideoVisual::SetLastUpdate(void)
 {
     QDateTime now = QDateTime::currentDateTimeUtc();
-    int64_t result = m_lastUpdate.time().msecsTo(now.time());
+    auto result = std::chrono::milliseconds(m_lastUpdate.time().msecsTo(now.time()));
     m_lastUpdate = now;
     return result;
 }
@@ -81,7 +81,7 @@ void VideoVisual::prepare()
 // caller holds lock
 VisualNode* VideoVisual::GetNode(void)
 {
-    int64_t timestamp = m_audio->GetAudioTime().count();
+    std::chrono::milliseconds timestamp = m_audio->GetAudioTime();
     while (m_nodes.size() > 1)
     {
         if (m_nodes.front()->m_offset > timestamp)
@@ -118,8 +118,9 @@ static inline void mono16_from_monofloat32(
 }
 
 // caller holds lock
-void VideoVisual::add(const void *b, unsigned long b_len, unsigned long w, int c,
-                      int p)
+void VideoVisual::add(const void *b, unsigned long b_len,
+                      std::chrono::milliseconds timecode,
+                      int c, int p)
 {
     if (!m_disabled && m_nodes.size() > 500)
     {
@@ -174,5 +175,5 @@ void VideoVisual::add(const void *b, unsigned long b_len, unsigned long w, int c
     else
         len = 0;
 
-    m_nodes.append(new VisualNode(l, r, len, w));
+    m_nodes.append(new VisualNode(l, r, len, timecode));
 }
diff --git a/mythtv/libs/libmythtv/visualisations/videovisual.h b/mythtv/libs/libmythtv/visualisations/videovisual.h
@@ -14,6 +14,8 @@
 #include "mythpainter.h"
 #include "videovisualdefs.h"
 
+using namespace std::chrono_literals;
+
 #define DESC QString("Visualiser: ")
 
 class MythRender;
@@ -22,8 +24,8 @@ class AudioPlayer;
 class VisualNode
 {
   public:
-    VisualNode(short *l, short *r, unsigned long n, unsigned long o)
-        : m_left(l), m_right(r), m_length(n), m_offset(o) { }
+    VisualNode(short *l, short *r, unsigned long n, std::chrono::milliseconds timecode)
+        : m_left(l), m_right(r), m_length(n), m_offset(timecode) { }
 
     ~VisualNode()
     {
@@ -34,7 +36,7 @@ class VisualNode
     short *m_left   {nullptr};
     short *m_right  {nullptr};
     long   m_length;
-    long   m_offset;
+    std::chrono::milliseconds m_offset;
 };
 
 class MTV_PUBLIC VideoVisual : public MythTV::Visual
@@ -53,13 +55,15 @@ class MTV_PUBLIC VideoVisual : public MythTV::Visual
                       QPaintDevice* device) = 0;
     virtual QString Name(void) = 0;
 
-    void add(const void *b, unsigned long b_len, unsigned long w, int c, int p) override; // Visual
+    void add(const void *b, unsigned long b_len,
+             std::chrono::milliseconds timecode,
+             int c, int p) override; // Visual
     void prepare() override; // Visual
 
   protected:
     VisualNode* GetNode(void);
     void DeleteNodes(void);
-    int64_t SetLastUpdate(void);
+    std::chrono::milliseconds SetLastUpdate(void);
 
     AudioPlayer       *m_audio        { nullptr };
     bool               m_needsPrepare { false   };

diff --git a/mythtv/libs/libmythtv/visualisations/videovisualmonoscope.cpp b/mythtv/libs/libmythtv/visualisations/videovisualmonoscope.cpp
@@ -24,7 +24,7 @@ void VideoVisualMonoScope::InitCommon(QRect Area)
     m_hue = 0.0;
     m_area = Area;
     m_rate = 1.0;
-    m_lastTime = QDateTime::currentMSecsSinceEpoch();
+    m_lastTime = nowAsDuration<std::chrono::milliseconds>();
     m_lineWidth = qMax(1.0F, m_area.height() * 0.004F);
 }
 
@@ -71,8 +71,8 @@ bool VideoVisualMonoScope::UpdateVertices(float* Buffer)
 void VideoVisualMonoScope::UpdateTime()
 {
     // try and give a similar rate of transitions for different playback speeds
-    auto timenow = QDateTime::currentMSecsSinceEpoch();
-    m_rate = (timenow - m_lastTime);
+    auto timenow = nowAsDuration<std::chrono::milliseconds>();
+    m_rate = (timenow - m_lastTime).count();
     m_lastTime = timenow;
     m_hue += m_rate / 7200.0F;
     if (m_hue > 1.0F)

diff --git a/mythtv/libs/libmythtv/visualisations/videovisualmonoscope.h b/mythtv/libs/libmythtv/visualisations/videovisualmonoscope.h
@@ -20,7 +20,7 @@ class VideoVisualMonoScope : public VideoVisual
     bool                  UpdateVertices  (float* Buffer);
     void                  UpdateTime      ();
 
-    int64_t               m_lastTime      { 0     };
+    std::chrono::milliseconds  m_lastTime { 0ms   };
     float                 m_hue           { 0.0   };
     float                 m_rate          { 1.0   };
     float                 m_lineWidth     { 1.0   };

diff --git a/mythtv/libs/libmythtv/visualisations/videovisualspectrum.cpp b/mythtv/libs/libmythtv/visualisations/videovisualspectrum.cpp
@@ -65,7 +65,7 @@ void VideoVisualSpectrum::Draw(const QRect Area, MythPainter* Painter, QPaintDev
     fftw_execute(m_lplan);
     fftw_execute(m_rplan);
 
-    double falloff = std::clamp(((static_cast<double>(SetLastUpdate())) / 40.0) * m_falloff, 0.0, 2048.0);
+    double falloff = std::clamp(((static_cast<double>(SetLastUpdate().count())) / 40.0) * m_falloff, 0.0, 2048.0);
     for (int l = 0, r = m_scale.range(); l < m_scale.range(); l++, r++)
     {
         int index = m_scale[l];