don't trigger render in `position` watch function

src/components/Player.vue

@@ -68,7 +68,7 @@
         }, 0)
       },
       position: function () {
-        if (this.image === null) return
+        if (this.playing || this.image === null) return
         this.tmp_ctx = this.$refs.canvas.getContext('2d')
         this.$render()
       }