Repository: yt-dlp/yt-dlp

Issue:
"Unable to extract OpenGraph" in FC2 Video
### Checklist

- [X] I'm reporting a broken site
- [X] I've verified that I'm running yt-dlp version **2022.02.04**. ([update instructions](https://github.com/yt-dlp/yt-dlp#update))
- [X] I've checked that all provided URLs are alive and playable in a browser
- [X] I've checked that all URLs and arguments with special characters are [properly quoted or escaped](https://github.com/ytdl-org/youtube-dl#video-url-contains-an-ampersand-and-im-getting-some-strange-output-1-2839-or-v-is-not-recognized-as-an-internal-or-external-command)
- [X] I've searched the [bugtracker](https://github.com/yt-dlp/yt-dlp/issues?q=) for similar issues including closed ones. DO NOT post duplicates
- [X] I've read the [guidelines for opening an issue](https://github.com/yt-dlp/yt-dlp/blob/master/CONTRIBUTING.md#opening-an-issue)
- [X] I've read about [sharing account credentials](https://github.com/yt-dlp/yt-dlp/blob/master/CONTRIBUTING.md#are-you-willing-to-share-account-details-if-needed) and I'm willing to share it if required

### Region

Japan

### Description

I get "Unable to extract OpenGraph" error whenever I try to download video from fc2.
Although it is a 24-minute video, the downloaded video is only 24KB.
I saw #2566 but it isn't solve.
Best regards.

### Verbose log

```shell
[debug] Command-line config: ['-vU', 'https://video.fc2.com/content/20220213MSqJytgT']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, err utf-8, pref UTF-8
[debug] yt-dlp version 2022.02.04 [c1653e9ef] (zip)
[debug] Python version 3.8.10 (CPython 64bit) - Linux-5.4.0-94-generic-x86_64-with-glibc2.29
[debug] exe versions: none
[debug] Optional libraries: secretstorage, sqlite
[debug] Proxy map: {}
Latest version: 2022.02.04, Current version: 2022.02.04
yt-dlp is up to date (2022.02.04)
[debug] [fc2] Extracting URL: https://video.fc2.com/content/20220213MSqJytgT
[fc2] 20220213MSqJytgT: Downloading webpage
WARNING: [fc2] unable to extract OpenGraph description; please report this issue on  https://github.com/yt-dlp/yt-dlp , filling out the "Broken site" issue template properly. Confirm you are on the latest version using -U
[fc2] 20220213MSqJytgT: Downloading info page
[debug] Default format spec: best/bestvideo+bestaudio
[info] 20220213MSqJytgT: Downloading 1 format(s): 0
[debug] Invoking downloader on "https://video.fc2.com/api/v3/videoplay/FGSFRL7G77YLaRCSvFvsjLRa7uFRYjSSOb2psTf/2?signature=92W9Q$3S_TLED-9427TY8JLOJYNDI$.F2YBGY5ZXL-&t=1644854861"
[download] Destination: やくならマグカップも 二番窯#1 [20220213MSqJytgT].mp4
[download] 100% of 24.32KiB in 00:00
```



Discussion:
Looks like the file being downloaded is m3u8 playlist.
You can workaround this bug by adding `--downloader ffmpeg` for now.

Also, this video is really lacking description. The error message should be fixed maybe :thinking:

Resolving patch:
diff --git a/yt_dlp/extractor/fc2.py b/yt_dlp/extractor/fc2.py
--- a/yt_dlp/extractor/fc2.py
+++ b/yt_dlp/extractor/fc2.py
@@ -90,7 +90,7 @@ def _real_extract(self, url):
                 webpage,
                 'title', fatal=False)
             thumbnail = self._og_search_thumbnail(webpage)
-            description = self._og_search_description(webpage)
+            description = self._og_search_description(webpage, default=None)
 
         vidplaylist = self._download_json(
             'https://video.fc2.com/api/v3/videoplaylist/%s?sh=1&fs=0' % video_id, video_id,
@@ -105,6 +105,7 @@ def _real_extract(self, url):
             'title': title,
             'url': vid_url,
             'ext': 'mp4',
+            'protocol': 'm3u8_native',
             'description': description,
             'thumbnail': thumbnail,
         }


Test patch: