diff --git a/test/test_unicode_literals.py b/test/test_unicode_literals.py
index d3cba869bc..19813e034c 100644
--- a/test/test_unicode_literals.py
+++ b/test/test_unicode_literals.py
@@ -20,7 +20,7 @@
 ]
 
 
-from helper import assertRegexpMatches
+from test.helper import assertRegexpMatches
 
 
 class TestUnicodeLiterals(unittest.TestCase):
diff --git a/youtube_dl/downloader/f4m.py b/youtube_dl/downloader/f4m.py
index 00f3a026c8..ef3e0d5f44 100644
--- a/youtube_dl/downloader/f4m.py
+++ b/youtube_dl/downloader/f4m.py
@@ -233,6 +233,7 @@ def real_download(self, filename, info_dict):
                 'continuedl': True,
                 'quiet': True,
                 'noprogress': True,
+                'ratelimit': self.params.get('ratelimit', None),
                 'test': self.params.get('test', False),
             }
         )
diff --git a/youtube_dl/extractor/adultswim.py b/youtube_dl/extractor/adultswim.py
index 39e4ca296f..502a9c25ad 100644
--- a/youtube_dl/extractor/adultswim.py
+++ b/youtube_dl/extractor/adultswim.py
@@ -7,6 +7,8 @@
 from .common import InfoExtractor
 from ..utils import (
     ExtractorError,
+    xpath_text,
+    float_or_none,
 )
 
 
@@ -128,7 +130,8 @@ def _real_extract(self, url):
                 segment_url, segment_title,
                 'Downloading segment information', 'Unable to download segment information')
 
-            segment_duration = idoc.find('.//trt').text.strip()
+            segment_duration = float_or_none(
+                xpath_text(idoc, './/trt', 'segment duration').strip())
 
             formats = []
             file_els = idoc.findall('.//files/file')
diff --git a/youtube_dl/extractor/bbccouk.py b/youtube_dl/extractor/bbccouk.py
index 01c02d360c..2d2f742aee 100644
--- a/youtube_dl/extractor/bbccouk.py
+++ b/youtube_dl/extractor/bbccouk.py
@@ -209,7 +209,7 @@ def _real_extract(self, url):
         webpage = self._download_webpage(url, group_id, 'Downloading video page')
 
         programme_id = self._search_regex(
-            r'"vpid"\s*:\s*"([\da-z]{8})"', webpage, 'vpid', fatal=False)
+            r'"vpid"\s*:\s*"([\da-z]{8})"', webpage, 'vpid', fatal=False, default=None)
         if programme_id:
             player = self._download_json(
                 'http://www.bbc.co.uk/iplayer/episode/%s.json' % group_id,