diff --git a/openlp/core/ui/media/webkitplayer.py b/openlp/core/ui/media/webkitplayer.py
index 4524d4cc7..19221ace0 100644
--- a/openlp/core/ui/media/webkitplayer.py
+++ b/openlp/core/ui/media/webkitplayer.py
@@ -178,7 +178,7 @@ class WebkitPlayer(MediaPlayer):
             vol = 0
         path = controller.media_info.file_info.absoluteFilePath()
         display.web_view.setVisible(True)
-        js = 'show_video("load", "%s", %s, %s);' % (path.replace('\\', '\\\\'), str(vol))
+        js = 'show_video("load", "{path}", {vol});'.format(path=path.replace('\\', '\\\\'), vol=str(vol))
         display.frame.evaluateJavaScript(js)
         return True
 
diff --git a/openlp/core/ui/themeform.py b/openlp/core/ui/themeform.py
index d18914411..2ec733629 100644
--- a/openlp/core/ui/themeform.py
+++ b/openlp/core/ui/themeform.py
@@ -465,8 +465,9 @@ class ThemeForm(QtWidgets.QWizard, Ui_ThemeWizard, RegistryProperties):
         """
         visible_formats = '(%s)' % '; '.join(VIDEO_EXT)
         actual_formats = '(%s)' % ' '.join(VIDEO_EXT)
-        video_filter = '%s %s %s' % (translate('OpenLP', 'Video Files'), visible_formats, actual_formats)
-        video_filter = '%s;;%s (*.*)' % (video_filter, UiStrings().AllFiles)
+        video_filter = '{trans} {visible} {actual}'.format(trans=translate('OpenLP', 'Video Files'),
+                                                           visible=visible_formats, actual=actual_formats)
+        video_filter = '{video};;{ui} (*.*)'.format(video=video_filter, ui=UiStrings().AllFiles)
         filename, filter_used = QtWidgets.QFileDialog.getOpenFileName(
             self, translate('OpenLP.ThemeWizard', 'Select Video'),
             self.video_file_edit.text(), video_filter)