diff --git a/avidemux_core/ADM_coreUtils/src/ADM_paramList.cpp b/avidemux_core/ADM_coreUtils/src/ADM_paramList.cpp
index dc2a65bc33..a1fa495dd0 100644
--- a/avidemux_core/ADM_coreUtils/src/ADM_paramList.cpp
+++ b/avidemux_core/ADM_coreUtils/src/ADM_paramList.cpp
@@ -179,6 +179,7 @@ static bool compressReadFromString(COMPRES_PARAMS *params,const char *str)
     if(!strcasecmp(tmp,"2PASS")) {params->mode=COMPRESS_2PASS;params->finalsize=val;return true;}
     if(!strcasecmp(tmp,"2PASSBITRATE")) {params->mode=COMPRESS_2PASS_BITRATE;params->avg_bitrate=val;return true;}
     if(!strcasecmp(tmp,"AQ")) {params->mode=COMPRESS_AQ;params->qz=val;return true;}
+    if(!strcasecmp(tmp,"LOSSLESS")) {params->mode=COMPRESS_LOSSLESS;return true;}
     ADM_error("Unknown mode :%s\n",tmp);
     return false;
 
@@ -197,8 +198,9 @@ bool ADM_compressWriteToString(COMPRES_PARAMS *params,  char **str)
         case COMPRESS_SAME:  sprintf(tmp,"SAME");break;
         case COMPRESS_2PASS_BITRATE: sprintf(tmp,"2PASSBITRATE=%" PRIu32,params->avg_bitrate);break;
         case COMPRESS_AQ:    sprintf(tmp,"AQ=%" PRIu32,params->qz);break;
+        case COMPRESS_LOSSLESS: sprintf(tmp,"LOSSLESS=1");break;
         default:
-            ADM_error("Unknown compressin mode \n");
+            ADM_error("Unknown compression mode \n");
             return false;
     }
     *str=ADM_strdup(tmp);
diff --git a/avidemux_core/ADM_coreVideoEncoder/include/ADM_encoderConf.h b/avidemux_core/ADM_coreVideoEncoder/include/ADM_encoderConf.h
index b5223ea68b..a06ea8f527 100644
--- a/avidemux_core/ADM_coreVideoEncoder/include/ADM_encoderConf.h
+++ b/avidemux_core/ADM_coreVideoEncoder/include/ADM_encoderConf.h
@@ -25,6 +25,7 @@ typedef enum
   COMPRESS_SAME,
   COMPRESS_2PASS_BITRATE,
   COMPRESS_AQ,
+  COMPRESS_LOSSLESS,
   COMPRESS_MAX
 } COMPRESSION_MODE;
 
diff --git a/avidemux_plugins/ADM_videoEncoder/x265/ADM_x265Setup.cpp b/avidemux_plugins/ADM_videoEncoder/x265/ADM_x265Setup.cpp
index 55816a713a..63c373d81e 100644
--- a/avidemux_plugins/ADM_videoEncoder/x265/ADM_x265Setup.cpp
+++ b/avidemux_plugins/ADM_videoEncoder/x265/ADM_x265Setup.cpp
@@ -180,6 +180,7 @@ bool x265Encoder::setup(void)
         MKPARAM(transferCharacteristics,transfer_characteristics)
     }
 
+  param.bLossless = 0;
   // -------------- rate control------------
   switch(x265Settings.general.params.mode)
   {
@@ -243,6 +244,9 @@ bool x265Encoder::setup(void)
                         param.rc.qp = 0;
                         param.rc.rfConstant = 0;
                         break;
+      case COMPRESS_LOSSLESS:
+                        param.bLossless = 1;
+                        break;
         default:
                         GUI_Error_HIG(QT_TRANSLATE_NOOP("x265","Not coded"),QT_TRANSLATE_NOOP("x265","this mode has not been implemented\n"));
                         return false;
diff --git a/avidemux_plugins/ADM_videoEncoder/x265/qt4/Q_x265.cpp b/avidemux_plugins/ADM_videoEncoder/x265/qt4/Q_x265.cpp
index 79eca5e483..22cea46f28 100644
--- a/avidemux_plugins/ADM_videoEncoder/x265/qt4/Q_x265.cpp
+++ b/avidemux_plugins/ADM_videoEncoder/x265/qt4/Q_x265.cpp
@@ -528,6 +528,9 @@ bool x265Dialog::upload(void)
             //encodingModeComboBox_currentIndexChanged(1);
             ui.quantiserSpinBox->setValue(ENCODING(qz));
             break;
+        case COMPRESS_LOSSLESS:
+            ui.encodingModeComboBox->setCurrentIndex(5);
+            break;
 
         default: ADM_assert(0);break;
     }
@@ -679,6 +682,7 @@ bool x265Dialog::download(void)
         case 2: ENCODING(mode)=COMPRESS_AQ;ENCODING(qz)=ui.quantiserSpinBox->value();break;
         case 3: ENCODING(mode)=COMPRESS_2PASS;ENCODING(finalsize)=ui.targetRateControlSpinBox->value();;break;
         case 4: ENCODING(mode)=COMPRESS_2PASS_BITRATE;ENCODING(avg_bitrate)=ui.targetRateControlSpinBox->value();;break;
+        case 5: ENCODING(mode)=COMPRESS_LOSSLESS;break;
     }
 
 #if X265_BUILD < 47
@@ -710,7 +714,7 @@ bool x265Dialog::download(void)
 // General tab
 void x265Dialog::encodingModeComboBox_currentIndexChanged(int index)
 {
-	bool enableQp = false, enableMaxCrf = false, enableStrictCbr = false;
+	bool enableQp = false, enableMaxCrf = false, enableStrictCbr = false, lossless = false;
 
 	switch (index)
 	{
@@ -739,6 +743,9 @@ void x265Dialog::encodingModeComboBox_currentIndexChanged(int index)
 			ui.targetRateControlLabel2->setText(QString::fromUtf8(QT_TRANSLATE_NOOP("x265","kbit/s")));
 			ui.targetRateControlSpinBox->setValue(lastBitrate);
 			break;
+                case 5: // Lossless
+                        lossless = true;
+                    break;
 	}
 
 	ui.quantiserLabel1->setEnabled(enableQp);
@@ -747,9 +754,9 @@ void x265Dialog::encodingModeComboBox_currentIndexChanged(int index)
 	ui.quantiserSlider->setEnabled(enableQp);
 	ui.quantiserSpinBox->setEnabled(enableQp);
 
-	ui.targetRateControlLabel1->setEnabled(!enableQp);
-	ui.targetRateControlLabel2->setEnabled(!enableQp);
-	ui.targetRateControlSpinBox->setEnabled(!enableQp);
+	ui.targetRateControlLabel1->setEnabled(!enableQp && !lossless);
+	ui.targetRateControlLabel2->setEnabled(!enableQp && !lossless);
+	ui.targetRateControlSpinBox->setEnabled(!enableQp && !lossless);
         
 #if X265_BUILD >= 41
         ui.strictCbrCheckBox->setEnabled(enableStrictCbr);
diff --git a/avidemux_plugins/ADM_videoEncoder/x265/qt4/x265ConfigDialog.ui b/avidemux_plugins/ADM_videoEncoder/x265/qt4/x265ConfigDialog.ui
index 27d7f54159..c8daaa96b9 100644
--- a/avidemux_plugins/ADM_videoEncoder/x265/qt4/x265ConfigDialog.ui
+++ b/avidemux_plugins/ADM_videoEncoder/x265/qt4/x265ConfigDialog.ui
@@ -377,6 +377,11 @@
                   <string>Average Bitrate (Two Pass)</string>
                  </property>
                 </item>
+                <item>
+                 <property name="text">
+                  <string>Lossless (Single Pass)</string>
+                 </property>
+                </item>
                </widget>
               </item>
               <item>