We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
cannot download Daum tvpot url
cannot download video from Daum tvpot which is Korean internet portal service
http://tvpot.daum.net/v/vfb45BtrWBWWHKEkOwXEghB


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `youtube_dl/extractor/daum.py`
Content:
```
1 # encoding: utf-8
2 
3 from __future__ import unicode_literals
4 
5 import re
6 
7 from .common import InfoExtractor
8 from ..compat import (
9     compat_urllib_parse,
10 )
11 
12 
13 class DaumIE(InfoExtractor):
14     _VALID_URL = r'https?://(?:m\.)?tvpot\.daum\.net/(?:v/|.*?clipid=)(?P<id>[^?#&]+)'
15     IE_NAME = 'daum.net'
16 
17     _TESTS = [{
18         'url': 'http://tvpot.daum.net/clip/ClipView.do?clipid=52554690',
19         'info_dict': {
20             'id': '52554690',
21             'ext': 'mp4',
22             'title': 'DOTA 2GETHER 시즌2 6회 - 2부',
23             'description': 'DOTA 2GETHER 시즌2 6회 - 2부',
24             'upload_date': '20130831',
25             'duration': 3868,
26         },
27     }, {
28         'url': 'http://tvpot.daum.net/v/vab4dyeDBysyBssyukBUjBz',
29         'only_matching': True,
30     }, {
31         'url': 'http://tvpot.daum.net/v/07dXWRka62Y%24',
32         'only_matching': True,
33     }]
34 
35     def _real_extract(self, url):
36         mobj = re.match(self._VALID_URL, url)
37         video_id = mobj.group('id')
38         canonical_url = 'http://tvpot.daum.net/v/%s' % video_id
39         webpage = self._download_webpage(canonical_url, video_id)
40         full_id = self._search_regex(
41             r'<iframe src="http://videofarm.daum.net/controller/video/viewer/Video.html\?.*?vid=(.+?)[&"]',
42             webpage, 'full id')
43         query = compat_urllib_parse.urlencode({'vid': full_id})
44         info = self._download_xml(
45             'http://tvpot.daum.net/clip/ClipInfoXml.do?' + query, video_id,
46             'Downloading video info')
47         urls = self._download_xml(
48             'http://videofarm.daum.net/controller/api/open/v1_2/MovieData.apixml?' + query,
49             video_id, 'Downloading video formats info')
50 
51         formats = []
52         for format_el in urls.findall('result/output_list/output_list'):
53             profile = format_el.attrib['profile']
54             format_query = compat_urllib_parse.urlencode({
55                 'vid': full_id,
56                 'profile': profile,
57             })
58             url_doc = self._download_xml(
59                 'http://videofarm.daum.net/controller/api/open/v1_2/MovieLocation.apixml?' + format_query,
60                 video_id, note='Downloading video data for %s format' % profile)
61             format_url = url_doc.find('result/url').text
62             formats.append({
63                 'url': format_url,
64                 'format_id': profile,
65             })
66 
67         return {
68             'id': video_id,
69             'title': info.find('TITLE').text,
70             'formats': formats,
71             'thumbnail': self._og_search_thumbnail(webpage),
72             'description': info.find('CONTENTS').text,
73             'duration': int(info.find('DURATION').text),
74             'upload_date': info.find('REGDTTM').text[:8],
75         }
76
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/youtube_dl/extractor/daum.py b/youtube_dl/extractor/daum.py
--- a/youtube_dl/extractor/daum.py
+++ b/youtube_dl/extractor/daum.py
@@ -38,7 +38,7 @@
         canonical_url = 'http://tvpot.daum.net/v/%s' % video_id
         webpage = self._download_webpage(canonical_url, video_id)
         full_id = self._search_regex(
-            r'<iframe src="http://videofarm.daum.net/controller/video/viewer/Video.html\?.*?vid=(.+?)[&"]',
+            r'src=["\']http://videofarm.daum.net/controller/video/viewer/Video.html\?.*?vid=(.+?)[&"\']',
             webpage, 'full id')
         query = compat_urllib_parse.urlencode({'vid': full_id})
         info = self._download_xml(

{"golden_diff": "diff --git a/youtube_dl/extractor/daum.py b/youtube_dl/extractor/daum.py\n--- a/youtube_dl/extractor/daum.py\n+++ b/youtube_dl/extractor/daum.py\n@@ -38,7 +38,7 @@\n         canonical_url = 'http://tvpot.daum.net/v/%s' % video_id\n         webpage = self._download_webpage(canonical_url, video_id)\n         full_id = self._search_regex(\n-            r'<iframe src=\"http://videofarm.daum.net/controller/video/viewer/Video.html\\?.*?vid=(.+?)[&\"]',\n+            r'src=[\"\\']http://videofarm.daum.net/controller/video/viewer/Video.html\\?.*?vid=(.+?)[&\"\\']',\n             webpage, 'full id')\n         query = compat_urllib_parse.urlencode({'vid': full_id})\n         info = self._download_xml(\n", "issue": "cannot download Daum tvpot url\ncannot download video from Daum tvpot which is Korean internet portal service\nhttp://tvpot.daum.net/v/vfb45BtrWBWWHKEkOwXEghB\n\n", "before_files": [{"content": "# encoding: utf-8\n\nfrom __future__ import unicode_literals\n\nimport re\n\nfrom .common import InfoExtractor\nfrom ..compat import (\n    compat_urllib_parse,\n)\n\n\nclass DaumIE(InfoExtractor):\n    _VALID_URL = r'https?://(?:m\\.)?tvpot\\.daum\\.net/(?:v/|.*?clipid=)(?P<id>[^?#&]+)'\n    IE_NAME = 'daum.net'\n\n    _TESTS = [{\n        'url': 'http://tvpot.daum.net/clip/ClipView.do?clipid=52554690',\n        'info_dict': {\n            'id': '52554690',\n            'ext': 'mp4',\n            'title': 'DOTA 2GETHER \uc2dc\uc98c2 6\ud68c - 2\ubd80',\n            'description': 'DOTA 2GETHER \uc2dc\uc98c2 6\ud68c - 2\ubd80',\n            'upload_date': '20130831',\n            'duration': 3868,\n        },\n    }, {\n        'url': 'http://tvpot.daum.net/v/vab4dyeDBysyBssyukBUjBz',\n        'only_matching': True,\n    }, {\n        'url': 'http://tvpot.daum.net/v/07dXWRka62Y%24',\n        'only_matching': True,\n    }]\n\n    def _real_extract(self, url):\n        mobj = re.match(self._VALID_URL, url)\n        video_id = mobj.group('id')\n        canonical_url = 'http://tvpot.daum.net/v/%s' % video_id\n        webpage = self._download_webpage(canonical_url, video_id)\n        full_id = self._search_regex(\n            r'<iframe src=\"http://videofarm.daum.net/controller/video/viewer/Video.html\\?.*?vid=(.+?)[&\"]',\n            webpage, 'full id')\n        query = compat_urllib_parse.urlencode({'vid': full_id})\n        info = self._download_xml(\n            'http://tvpot.daum.net/clip/ClipInfoXml.do?' + query, video_id,\n            'Downloading video info')\n        urls = self._download_xml(\n            'http://videofarm.daum.net/controller/api/open/v1_2/MovieData.apixml?' + query,\n            video_id, 'Downloading video formats info')\n\n        formats = []\n        for format_el in urls.findall('result/output_list/output_list'):\n            profile = format_el.attrib['profile']\n            format_query = compat_urllib_parse.urlencode({\n                'vid': full_id,\n                'profile': profile,\n            })\n            url_doc = self._download_xml(\n                'http://videofarm.daum.net/controller/api/open/v1_2/MovieLocation.apixml?' + format_query,\n                video_id, note='Downloading video data for %s format' % profile)\n            format_url = url_doc.find('result/url').text\n            formats.append({\n                'url': format_url,\n                'format_id': profile,\n            })\n\n        return {\n            'id': video_id,\n            'title': info.find('TITLE').text,\n            'formats': formats,\n            'thumbnail': self._og_search_thumbnail(webpage),\n            'description': info.find('CONTENTS').text,\n            'duration': int(info.find('DURATION').text),\n            'upload_date': info.find('REGDTTM').text[:8],\n        }\n", "path": "youtube_dl/extractor/daum.py"}], "after_files": [{"content": "# encoding: utf-8\n\nfrom __future__ import unicode_literals\n\nimport re\n\nfrom .common import InfoExtractor\nfrom ..compat import (\n    compat_urllib_parse,\n)\n\n\nclass DaumIE(InfoExtractor):\n    _VALID_URL = r'https?://(?:m\\.)?tvpot\\.daum\\.net/(?:v/|.*?clipid=)(?P<id>[^?#&]+)'\n    IE_NAME = 'daum.net'\n\n    _TESTS = [{\n        'url': 'http://tvpot.daum.net/clip/ClipView.do?clipid=52554690',\n        'info_dict': {\n            'id': '52554690',\n            'ext': 'mp4',\n            'title': 'DOTA 2GETHER \uc2dc\uc98c2 6\ud68c - 2\ubd80',\n            'description': 'DOTA 2GETHER \uc2dc\uc98c2 6\ud68c - 2\ubd80',\n            'upload_date': '20130831',\n            'duration': 3868,\n        },\n    }, {\n        'url': 'http://tvpot.daum.net/v/vab4dyeDBysyBssyukBUjBz',\n        'only_matching': True,\n    }, {\n        'url': 'http://tvpot.daum.net/v/07dXWRka62Y%24',\n        'only_matching': True,\n    }]\n\n    def _real_extract(self, url):\n        mobj = re.match(self._VALID_URL, url)\n        video_id = mobj.group('id')\n        canonical_url = 'http://tvpot.daum.net/v/%s' % video_id\n        webpage = self._download_webpage(canonical_url, video_id)\n        full_id = self._search_regex(\n            r'src=[\"\\']http://videofarm.daum.net/controller/video/viewer/Video.html\\?.*?vid=(.+?)[&\"\\']',\n            webpage, 'full id')\n        query = compat_urllib_parse.urlencode({'vid': full_id})\n        info = self._download_xml(\n            'http://tvpot.daum.net/clip/ClipInfoXml.do?' + query, video_id,\n            'Downloading video info')\n        urls = self._download_xml(\n            'http://videofarm.daum.net/controller/api/open/v1_2/MovieData.apixml?' + query,\n            video_id, 'Downloading video formats info')\n\n        formats = []\n        for format_el in urls.findall('result/output_list/output_list'):\n            profile = format_el.attrib['profile']\n            format_query = compat_urllib_parse.urlencode({\n                'vid': full_id,\n                'profile': profile,\n            })\n            url_doc = self._download_xml(\n                'http://videofarm.daum.net/controller/api/open/v1_2/MovieLocation.apixml?' + format_query,\n                video_id, note='Downloading video data for %s format' % profile)\n            format_url = url_doc.find('result/url').text\n            formats.append({\n                'url': format_url,\n                'format_id': profile,\n            })\n\n        return {\n            'id': video_id,\n            'title': info.find('TITLE').text,\n            'formats': formats,\n            'thumbnail': self._og_search_thumbnail(webpage),\n            'description': info.find('CONTENTS').text,\n            'duration': int(info.find('DURATION').text),\n            'upload_date': info.find('REGDTTM').text[:8],\n        }\n", "path": "youtube_dl/extractor/daum.py"}]}