3 files changed, 4 insertions, 18 deletions
diff --git a/youtube_dl/extractor/generic.py b/youtube_dl/extractor/generic.py
index 9178d2b7b..6c212efac 100644
--- a/youtube_dl/extractor/generic.py
+++ b/youtube_dl/extractor/generic.py
@@ -26,7 +26,6 @@ from ..utils import (
     unsmuggle_url,
     UnsupportedError,
     url_basename,
-    url_infer_protocol,
     xpath_text,
 )
 from .brightcove import BrightcoveIE
@@ -1286,7 +1285,7 @@ class GenericIE(InfoExtractor):
             r'<iframe[^>]+src="(?P<url>%s)"' % UDNEmbedIE._VALID_URL, webpage)
         if mobj is not None:
             return self.url_result(
-                url_infer_protocol(url, mobj.group('url')), 'UDNEmbed')
+                compat_urlparse.urljoin(url, mobj.group('url')), 'UDNEmbed')
 
         def check_video(vurl):
             if YoutubeIE.suitable(vurl):
diff --git a/youtube_dl/extractor/udn.py b/youtube_dl/extractor/udn.py
index 2b9a733e8..bba25bb58 100644
--- a/youtube_dl/extractor/udn.py
+++ b/youtube_dl/extractor/udn.py
@@ -3,10 +3,8 @@ from __future__ import unicode_literals
 
 import json
 from .common import InfoExtractor
-from ..utils import (
-    url_infer_protocol,
-    js_to_json
-)
+from ..utils import js_to_json
+from ..compat import compat_urlparse
 
 
 class UDNEmbedIE(InfoExtractor):
@@ -45,7 +43,7 @@ class UDNEmbedIE(InfoExtractor):
 
         formats = [{
             'url': self._download_webpage(
-                url_infer_protocol(url, api_url), video_id,
+                compat_urlparse.urljoin(url, api_url), video_id,
                 'retrieve url for %s video' % video_type),
             'format_id': video_type,
             'preference': 0 if video_type == 'mp4' else -1,
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index f3b8d9f81..52f0dd09a 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -1711,17 +1711,6 @@ def determine_protocol(info_dict):
     return compat_urllib_parse_urlparse(url).scheme
 
 
-def url_infer_protocol(ref_url, target_url):
-    """ Infer protocol for protocol independent target urls """
-    parsed_target_url = list(compat_urllib_parse_urlparse(target_url))
-    if parsed_target_url[0]:
-        return target_url
-
-    parsed_target_url[0] = compat_urllib_parse_urlparse(ref_url).scheme
-
-    return compat_urlparse.urlunparse(parsed_target_url)
-
-
 def render_table(header_row, data):
     """ Render a list of rows, each as a list of values """
     table = [header_row] + data