diff --git a/src/you_get/extractors/youtube.py b/src/you_get/extractors/youtube.py
index 64af5c14..61dc2cb7 100644
--- a/src/you_get/extractors/youtube.py
+++ b/src/you_get/extractors/youtube.py
@@ -258,11 +258,17 @@ class YouTube(VideoExtractor):
                     burls = rep.getElementsByTagName('BaseURL')
                     dash_mp4_a_url = burls[0].firstChild.nodeValue
                     dash_mp4_a_size = burls[0].getAttribute('yt:contentLength')
+                    if not dash_mp4_a_size:
+                        try: dash_mp4_a_size = url_size(dash_mp4_a_url)
+                        except: continue
                 elif mimeType == 'audio/webm':
                     rep = aset.getElementsByTagName('Representation')[-1]
                     burls = rep.getElementsByTagName('BaseURL')
                     dash_webm_a_url = burls[0].firstChild.nodeValue
                     dash_webm_a_size = burls[0].getAttribute('yt:contentLength')
+                    if not dash_webm_a_size:
+                        try: dash_webm_a_size = url_size(dash_webm_a_url)
+                        except: continue
                 elif mimeType == 'video/mp4':
                     for rep in aset.getElementsByTagName('Representation'):
                         w = int(rep.getAttribute('width'))
@@ -271,6 +277,9 @@ class YouTube(VideoExtractor):
                         burls = rep.getElementsByTagName('BaseURL')
                         dash_url = burls[0].firstChild.nodeValue
                         dash_size = burls[0].getAttribute('yt:contentLength')
+                        if not dash_size:
+                            try: dash_size = url_size(dash_url)
+                            except: continue
                         self.dash_streams[itag] = {
                             'quality': '%sx%s' % (w, h),
                             'itag': itag,
@@ -288,6 +297,9 @@ class YouTube(VideoExtractor):
                         burls = rep.getElementsByTagName('BaseURL')
                         dash_url = burls[0].firstChild.nodeValue
                         dash_size = burls[0].getAttribute('yt:contentLength')
+                        if not dash_size:
+                            try: dash_size = url_size(dash_url)
+                            except: continue
                         self.dash_streams[itag] = {
                             'quality': '%sx%s' % (w, h),
                             'itag': itag,