diff --git a/app/main.cpp b/app/main.cpp
index a0fddcdf5..c9938efd6 100644
--- a/app/main.cpp
+++ b/app/main.cpp
@@ -35,7 +35,7 @@ static int runQtApplication(int argc, char* argv[], qtwebapp::LoggerWithFile *lo
 */
 	QCoreApplication::setOrganizationName("f4exb");
 	QCoreApplication::setApplicationName("SDRangel");
-	QCoreApplication::setApplicationVersion("4.2.1");
+    QCoreApplication::setApplicationVersion("4.2.2");
 
 #if 1
 	qApp->setStyle(QStyleFactory::create("fusion"));
diff --git a/appbench/main.cpp b/appbench/main.cpp
index 0ec5d274a..6dba5b70d 100644
--- a/appbench/main.cpp
+++ b/appbench/main.cpp
@@ -57,7 +57,7 @@ static int runQtApplication(int argc, char* argv[], qtwebapp::LoggerWithFile *lo
 
     QCoreApplication::setOrganizationName("f4exb");
     QCoreApplication::setApplicationName("SDRangelBench");
-    QCoreApplication::setApplicationVersion("4.2.1");
+    QCoreApplication::setApplicationVersion("4.2.2");
 
     int catchSignals[] = {SIGQUIT, SIGINT, SIGTERM, SIGHUP};
     std::vector<int> vsig(catchSignals, catchSignals + sizeof(catchSignals) / sizeof(int));
diff --git a/appsrv/main.cpp b/appsrv/main.cpp
index 8141b79ea..89643ee0d 100644
--- a/appsrv/main.cpp
+++ b/appsrv/main.cpp
@@ -56,7 +56,7 @@ static int runQtApplication(int argc, char* argv[], qtwebapp::LoggerWithFile *lo
 
     QCoreApplication::setOrganizationName("f4exb");
     QCoreApplication::setApplicationName("SDRangelSrv");
-    QCoreApplication::setApplicationVersion("4.2.1");
+    QCoreApplication::setApplicationVersion("4.2.2");
 
     int catchSignals[] = {SIGQUIT, SIGINT, SIGTERM, SIGHUP};
     std::vector<int> vsig(catchSignals, catchSignals + sizeof(catchSignals) / sizeof(int));
diff --git a/plugins/samplesource/filesource/filesourcegui.cpp b/plugins/samplesource/filesource/filesourcegui.cpp
index de56a6d5f..86c2a0ac2 100644
--- a/plugins/samplesource/filesource/filesourcegui.cpp
+++ b/plugins/samplesource/filesource/filesourcegui.cpp
@@ -286,10 +286,6 @@ void FileSourceGui::on_navTimeSlider_valueChanged(int value)
 {
 	if (m_enableNavTime && ((value >= 0) && (value <= 100)))
 	{
-		int t_sec = (m_recordLength * value) / 100;
-		QTime t(0, 0, 0, 0);
-		t = t.addSecs(t_sec);
-
 		FileSourceInput::MsgConfigureFileSourceSeek* message = FileSourceInput::MsgConfigureFileSourceSeek::create(value);
 		m_sampleSource->getInputMessageQueue()->push(message);
 	}
@@ -338,12 +334,12 @@ void FileSourceGui::updateWithStreamData()
 
 void FileSourceGui::updateWithStreamTime()
 {
-	int t_sec = 0;
-	int t_msec = 0;
+    qint64 t_sec = 0;
+    qint64 t_msec = 0;
 
 	if (m_sampleRate > 0){
 		t_sec = m_samplesCount / m_sampleRate;
-		t_msec = (m_samplesCount - (t_sec * m_sampleRate)) * 1000 / m_sampleRate;
+        t_msec = (m_samplesCount - (t_sec * m_sampleRate)) * 1000LL / m_sampleRate;
 	}
 
 	QTime t(0, 0, 0, 0);
@@ -352,10 +348,10 @@ void FileSourceGui::updateWithStreamTime()
 	QString s_timems = t.toString("HH:mm:ss.zzz");
 	ui->relTimeText->setText(s_timems);
 
-    quint64 startingTimeStampMsec = (quint64) m_startingTimeStamp * 1000LL;
+    qint64 startingTimeStampMsec = m_startingTimeStamp * 1000LL;
 	QDateTime dt = QDateTime::fromMSecsSinceEpoch(startingTimeStampMsec);
-    dt = dt.addSecs((quint64) t_sec);
-    dt = dt.addMSecs((quint64) t_msec);
+    dt = dt.addSecs(t_sec);
+    dt = dt.addMSecs(t_msec);
 	QString s_date = dt.toString("yyyy-MM-dd HH:mm:ss.zzz");
 	ui->absTimeText->setText(s_date);
 
diff --git a/plugins/samplesource/filesource/filesourcegui.h b/plugins/samplesource/filesource/filesourcegui.h
index a580d528f..9ed216613 100644
--- a/plugins/samplesource/filesource/filesourcegui.h
+++ b/plugins/samplesource/filesource/filesourcegui.h
@@ -65,9 +65,9 @@ private:
 	int m_sampleRate;
 	quint32 m_sampleSize;
 	quint64 m_centerFrequency;
-	quint32 m_recordLength;
-	std::time_t m_startingTimeStamp;
-	int m_samplesCount;
+    quint64 m_recordLength;
+    quint64 m_startingTimeStamp;
+    quint64 m_samplesCount;
 	std::size_t m_tickCount;
 	bool m_enableNavTime;
     int m_deviceSampleRate;
diff --git a/plugins/samplesource/filesource/filesourceinput.cpp b/plugins/samplesource/filesource/filesourceinput.cpp
index 053eadac8..67929a00e 100644
--- a/plugins/samplesource/filesource/filesourceinput.cpp
+++ b/plugins/samplesource/filesource/filesourceinput.cpp
@@ -144,9 +144,9 @@ void FileSourceInput::seekFileStream(int seekPercentage)
 
 	if ((m_ifstream.is_open()) && m_fileSourceThread && !m_fileSourceThread->isRunning())
 	{
-		int seekPoint = ((m_recordLength * seekPercentage) / 100) * m_sampleRate;
+        quint64 seekPoint = ((m_recordLength * seekPercentage) / 100) * m_sampleRate;
 		m_fileSourceThread->setSamplesCount(seekPoint);
-		seekPoint *= 4; // + sizeof(FileSink::Header)
+        seekPoint *= (m_sampleSize == 24 ? 8 : 4); // + sizeof(FileSink::Header)
 		m_ifstream.clear();
 		m_ifstream.seekg(seekPoint + sizeof(FileRecord::Header), std::ios::beg);
 	}
@@ -276,7 +276,7 @@ void FileSourceInput::setCenterFrequency(qint64 centerFrequency)
     }
 }
 
-std::time_t FileSourceInput::getStartingTimeStamp() const
+quint64 FileSourceInput::getStartingTimeStamp() const
 {
 	return m_startingTimeStamp;
 }
diff --git a/plugins/samplesource/filesource/filesourceinput.h b/plugins/samplesource/filesource/filesourceinput.h
index 4f149da7e..cc731bf13 100644
--- a/plugins/samplesource/filesource/filesourceinput.h
+++ b/plugins/samplesource/filesource/filesourceinput.h
@@ -175,14 +175,14 @@ public:
 		int getSampleRate() const { return m_sampleRate; }
 		quint32 getSampleSize() const { return m_sampleSize; }
 		quint64 getCenterFrequency() const { return m_centerFrequency; }
-		std::time_t getStartingTimeStamp() const { return m_startingTimeStamp; }
-		quint32 getRecordLength() const { return m_recordLength; }
+        quint64 getStartingTimeStamp() const { return m_startingTimeStamp; }
+        quint64 getRecordLength() const { return m_recordLength; }
 
 		static MsgReportFileSourceStreamData* create(int sampleRate,
 		        quint32 sampleSize,
 				quint64 centerFrequency,
-				std::time_t startingTimeStamp,
-				quint32 recordLength)
+                quint64 startingTimeStamp,
+                quint64 recordLength)
 		{
 			return new MsgReportFileSourceStreamData(sampleRate, sampleSize, centerFrequency, startingTimeStamp, recordLength);
 		}
@@ -191,14 +191,14 @@ public:
 		int m_sampleRate;
 		quint32 m_sampleSize;
 		quint64 m_centerFrequency;
-		std::time_t m_startingTimeStamp;
-		quint32 m_recordLength;
+        quint64 m_startingTimeStamp;
+        quint64 m_recordLength;
 
 		MsgReportFileSourceStreamData(int sampleRate,
 		        quint32 sampleSize,
 				quint64 centerFrequency,
-				std::time_t startingTimeStamp,
-				quint32 recordLength) :
+                quint64 startingTimeStamp,
+                quint64 recordLength) :
 			Message(),
 			m_sampleRate(sampleRate),
 			m_sampleSize(sampleSize),
@@ -212,17 +212,17 @@ public:
 		MESSAGE_CLASS_DECLARATION
 
 	public:
-		std::size_t getSamplesCount() const { return m_samplesCount; }
+        quint64 getSamplesCount() const { return m_samplesCount; }
 
-		static MsgReportFileSourceStreamTiming* create(std::size_t samplesCount)
+        static MsgReportFileSourceStreamTiming* create(quint64 samplesCount)
 		{
 			return new MsgReportFileSourceStreamTiming(samplesCount);
 		}
 
 	protected:
-		std::size_t m_samplesCount;
+        quint64 m_samplesCount;
 
-		MsgReportFileSourceStreamTiming(std::size_t samplesCount) :
+        MsgReportFileSourceStreamTiming(quint64 samplesCount) :
 			Message(),
 			m_samplesCount(samplesCount)
 		{ }
@@ -263,7 +263,7 @@ public:
 	virtual int getSampleRate() const;
 	virtual quint64 getCenterFrequency() const;
     virtual void setCenterFrequency(qint64 centerFrequency);
-	std::time_t getStartingTimeStamp() const;
+    quint64 getStartingTimeStamp() const;
 
 	virtual bool handleMessage(const Message& message);
 
@@ -295,8 +295,8 @@ public:
 	int m_sampleRate;
 	quint32 m_sampleSize;
 	quint64 m_centerFrequency;
-	quint32 m_recordLength; //!< record length in seconds computed from file size
-	std::time_t m_startingTimeStamp;
+    quint64 m_recordLength; //!< record length in seconds computed from file size
+    quint64 m_startingTimeStamp;
 	const QTimer& m_masterTimer;
 
 	void openFileStream();
diff --git a/plugins/samplesource/filesource/filesourceplugin.cpp b/plugins/samplesource/filesource/filesourceplugin.cpp
index 71a128bc2..2f4de4d84 100644
--- a/plugins/samplesource/filesource/filesourceplugin.cpp
+++ b/plugins/samplesource/filesource/filesourceplugin.cpp
@@ -29,7 +29,7 @@
 
 const PluginDescriptor FileSourcePlugin::m_pluginDescriptor = {
 	QString("File source input"),
-	QString("4.2.1"),
+    QString("4.2.2"),
 	QString("(c) Edouard Griffiths, F4EXB"),
 	QString("https://github.com/f4exb/sdrangel"),
 	true,
diff --git a/plugins/samplesource/filesource/filesourcethread.h b/plugins/samplesource/filesource/filesourcethread.h
index ef02de9a1..6e26589d7 100644
--- a/plugins/samplesource/filesource/filesourcethread.h
+++ b/plugins/samplesource/filesource/filesourcethread.h
@@ -44,8 +44,11 @@ public:
 	void setSampleRateAndSize(int samplerate, quint32 samplesize);
     void setBuffers(std::size_t chunksize);
 	bool isRunning() const { return m_running; }
-	std::size_t getSamplesCount() const { return m_samplesCount; }
-	void setSamplesCount(int samplesCount) { m_samplesCount = samplesCount; }
+    quint64 getSamplesCount() const {
+        qDebug("FileSourceThread::getSamplesCount: m_samplesCount: %llu", m_samplesCount);
+        return m_samplesCount;
+    }
+    void setSamplesCount(quint64 samplesCount) { m_samplesCount = samplesCount; }
 
 	void connectTimer(const QTimer& timer);
 
@@ -58,14 +61,14 @@ private:
 	quint8  *m_fileBuf;
 	quint8  *m_convertBuf;
 	std::size_t m_bufsize;
-	std::size_t m_chunksize;
+    qint64 m_chunksize;
 	SampleSinkFifo* m_sampleFifo;
-	std::size_t m_samplesCount;
+    quint64 m_samplesCount;
 
 	int m_samplerate;      //!< File I/Q stream original sample rate
-	quint32 m_samplesize;  //!< File effective sample size in bits (I or Q). Ex: 16, 24.
-	quint32 m_samplebytes; //!< Number of bytes used to store a I or Q sample. Ex: 2. 4.
-    int m_throttlems;
+    quint64 m_samplesize;  //!< File effective sample size in bits (I or Q). Ex: 16, 24.
+    quint64 m_samplebytes; //!< Number of bytes used to store a I or Q sample. Ex: 2. 4.
+    qint64 m_throttlems;
     QElapsedTimer m_elapsedTimer;
     bool m_throttleToggle;