diff --git a/README.md b/README.md
index 3ff33c156..43e5114ea 100644
--- a/README.md
+++ b/README.md
@@ -553,6 +553,10 @@ The current default template is `%(title)s-%(id)s.%(ext)s`.
 
 In some cases, you don't want special characters such as 中, spaces, or &, such as when transferring the downloaded filename to a Windows system or the filename through an 8bit-unsafe channel. In these cases, add the `--restrict-filenames` flag to get a shorter title:
 
+#### Output template and Windows batch files
+
+If you are using output template inside a Windows batch file then you must escape plain percent characters (`%`) by doubling, so that `-o "%(title)s-%(id)s.%(ext)s"` should become `-o "%%(title)s-%%(id)s.%%(ext)s"`. However you should not touch `%`'s that are not plain characters, e.g. environment variables for expansion should stay intact: `-o "C:\%HOMEPATH%\Desktop\%%(title)s.%%(ext)s"`.
+
 #### Output template examples
 
 Note on Windows you may need to use double quotes instead of single.
diff --git a/youtube_dl/extractor/nrk.py b/youtube_dl/extractor/nrk.py
index 486e086bb..4a790da7b 100644
--- a/youtube_dl/extractor/nrk.py
+++ b/youtube_dl/extractor/nrk.py
@@ -163,7 +163,7 @@ class NRKTVIE(NRKBaseIE):
             'ext': 'mp4',
             'title': '20 spørsmål 23.05.2014',
             'description': 'md5:bdea103bc35494c143c6a9acdd84887a',
-            'duration': 1741.52,
+            'duration': 1741,
         },
     }, {
         'url': 'https://tv.nrk.no/program/mdfp15000514',
@@ -173,7 +173,7 @@ class NRKTVIE(NRKBaseIE):
             'ext': 'mp4',
             'title': 'Grunnlovsjubiléet - Stor ståhei for ingenting 24.05.2014',
             'description': 'md5:89290c5ccde1b3a24bb8050ab67fe1db',
-            'duration': 4605.08,
+            'duration': 4605,
         },
     }, {
         # single playlist video