diff --git a/youtube_dl/extractor/collegehumor.py b/youtube_dl/extractor/collegehumor.py
index 5ad170d4f6..4a0b0af5a9 100644
--- a/youtube_dl/extractor/collegehumor.py
+++ b/youtube_dl/extractor/collegehumor.py
@@ -10,7 +10,7 @@ from ..utils import (
 
 
 class CollegeHumorIE(InfoExtractor):
-    _VALID_URL = r'^(?:https?://)?(?:www\.)?collegehumor\.com/video/(?P<videoid>[0-9]+)/(?P<shorttitle>.*)$'
+    _VALID_URL = r'^(?:https?://)?(?:www\.)?collegehumor\.com/(video|embed)/(?P<videoid>[0-9]+)/(?P<shorttitle>.*)$'
 
     _TEST = {
         u'url': u'http://www.collegehumor.com/video/6902724/comic-con-cosplay-catastrophe',
@@ -43,6 +43,9 @@ class CollegeHumorIE(InfoExtractor):
         mdoc = xml.etree.ElementTree.fromstring(metaXml)
         try:
             videoNode = mdoc.findall('./video')[0]
+            youtubeIdNode = videoNode.find('./youtubeID')
+            if youtubeIdNode is not None:
+                return self.url_result(youtubeIdNode.text, 'Youtube')
             info['description'] = videoNode.findall('./description')[0].text
             info['title'] = videoNode.findall('./caption')[0].text
             info['thumbnail'] = videoNode.findall('./thumbnail')[0].text
diff --git a/youtube_dl/extractor/tf1.py b/youtube_dl/extractor/tf1.py
index e0ffeced50..a8af89f830 100644
--- a/youtube_dl/extractor/tf1.py
+++ b/youtube_dl/extractor/tf1.py
@@ -10,6 +10,7 @@ class TF1IE(InfoExtractor):
     TF1 uses the wat.tv player, currently it can only download videos with the
     html5 player enabled, it cannot download HD videos.
     """
+    _WORKING = False
     _VALID_URL = r'http://videos.tf1.fr/.*-(.*?).html'
     _TEST = {
         u'url': u'http://videos.tf1.fr/auto-moto/citroen-grand-c4-picasso-2013-presentation-officielle-8062060.html',
diff --git a/youtube_dl/extractor/wat.py b/youtube_dl/extractor/wat.py
index 0d1302cd20..0407a2d26c 100644
--- a/youtube_dl/extractor/wat.py
+++ b/youtube_dl/extractor/wat.py
@@ -12,6 +12,7 @@ from ..utils import (
 
 
 class WatIE(InfoExtractor):
+    _WORKING = False
     _VALID_URL=r'http://www.wat.tv/.*-(?P<shortID>.*?)_.*?.html'
     IE_NAME = 'wat.tv'
     _TEST = {
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index 0d49c07214..39894ae882 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -731,7 +731,7 @@ class YoutubeChannelIE(InfoExtractor):
     _VALID_URL = r"^(?:https?://)?(?:youtu\.be|(?:\w+\.)?youtube(?:-nocookie)?\.com)/channel/([0-9A-Za-z_-]+)"
     _TEMPLATE_URL = 'http://www.youtube.com/channel/%s/videos?sort=da&flow=list&view=0&page=%s&gl=US&hl=en'
     _MORE_PAGES_INDICATOR = 'yt-uix-load-more'
-    _MORE_PAGES_URL = 'http://www.youtube.com/channel_ajax?action_load_more_videos=1&flow=list&paging=%s&view=0&sort=da&channel_id=%s'
+    _MORE_PAGES_URL = 'http://www.youtube.com/c4_browse_ajax?action_load_more_videos=1&flow=list&paging=%s&view=0&sort=da&channel_id=%s'
     IE_NAME = u'youtube:channel'
 
     def extract_videos_from_page(self, page):