better filtering

rowers/interactiveplots.py

@@ -2956,15 +2956,12 @@ def interactive_chart_video(videodata):
 
     data = zip(time,spm)
 
-    data2 = []
+    data2 = "["
 
     for t,s in data:
-        data2.append(
-            {
-                'x':t,
-                'y':s,
-            }
-        )
+        data2 += "{x: %s, y: %s}, " % (t,s)
+
+    data2 = data2[:-2] + "]"
 
     markerpoint = {
         'x': time[0],