diff --git a/motioneye/handlers.py b/motioneye/handlers.py
index d69db8eae..4fe9125f4 100644
--- a/motioneye/handlers.py
+++ b/motioneye/handlers.py
@@ -19,6 +19,7 @@
 import hashlib
 import json
 import logging
+import mimetypes
 import os
 import re
 import socket
@@ -1521,7 +1522,7 @@ def download(self, camera_id, filename):
             content = mediafiles.get_media_content(camera_config, filename, 'movie')
             
             pretty_filename = camera_config['@name'] + '_' + os.path.basename(filename)
-            self.set_header('Content-Type', 'video/mpeg')
+            self.set_header('Content-Type', mimetypes.guess_type(filename)[0] or 'video/mpeg')
             self.set_header('Content-Disposition', 'attachment; filename=' + pretty_filename + ';')
             
             self.finish(content)
@@ -1533,7 +1534,7 @@ def on_response(response=None, error=None):
                             'url': remote.pretty_camera_url(camera_config), 'msg': error}})
 
                 pretty_filename = os.path.basename(filename)  # no camera name available w/o additional request
-                self.set_header('Content-Type', 'video/mpeg')
+                self.set_header('Content-Type', mimetypes.guess_type(filename)[0] or 'video/mpeg')
                 self.set_header('Content-Disposition', 'attachment; filename=' + pretty_filename + ';')
                 
                 self.finish(response)
diff --git a/motioneye/static/js/main.js b/motioneye/static/js/main.js
index e11ff1668..1097a0655 100644
--- a/motioneye/static/js/main.js
+++ b/motioneye/static/js/main.js
@@ -4932,6 +4932,11 @@ function isFullScreen() {
 function refreshCameraFrames() {
     var timestamp = new Date().getTime();
 
+    if ($('div.modal-container').is(':visible')) {
+        /* pause camera refresh if hidden by a dialog */
+        return setTimeout(refreshCameraFrames, 1000);
+    }
+
     function refreshCameraFrame(cameraId, img, serverSideResize) {
         if (refreshDisabled[cameraId]) {
             /* camera refreshing disabled, retry later */