make sure position is always between 0% and 100%

app/static/js/VideoElement.js

@@ -169,7 +169,7 @@ window.VideoElement = function(options) {
     function getCurrentTime() {
         var item = self.items[self.currentItem];
         var currentTime = self.seeking || self.loading
-            ? self.currentTime
+            ? (self.currentTime - (self.options["in"] || 0))
             : item ? item.position + self.video.currentTime - item['in'] - self.options["in"] : 0;
         return currentTime
     }

app/static/js/VideoPlayer.js

@@ -364,8 +364,9 @@ window.VideoPlayer = function(options) {
     that.querySelector('.controls .position input').addEventListener('input', event => {
         event.preventDefault()
         event.stopPropagation()
-        setProgressPosition(event.target.value)
-        var position = event.target.value/100 * self.options.duration
+        const value = Math.min(100, Math.max(0, parseFloat(event.target.value))
+        setProgressPosition(value)
+        var position = value/100 * self.options.duration
         displayTime(position)
         that.currentTime(position)
         hideControlsLater()
@@ -386,7 +387,9 @@ window.VideoPlayer = function(options) {
         if (self.options.position) {
             currentTime -= self.options.position
         }
-        setProgressPosition(100 * currentTime / duration)
+        let position = 100 * currentTime / duration
+        position = Math.min(100, Math.max(0, position))
+        setProgressPosition(position)
         displayTime(currentTime)
     })