Repository: yt-dlp
Issue: youku.com timestamp/date, description and comments
Labels: site-enhancement,triage

### DO NOT REMOVE OR SKIP THE ISSUE TEMPLATE

- [X] I understand that I will be **blocked** if I *intentionally* remove or skip any mandatory\* field

### Checklist

- [x] I'm requesting a site-specific feature
- [X] I've verified that I'm running yt-dlp version **2023.03.04** ([update instructions](https://github.com/yt-dlp/yt-dlp#update)) or later (specify commit)
- [X] I've checked that all provided URLs are playable in a browser with the same IP and same login details
- [X] I've searched [known issues](https://github.com/yt-dlp/yt-dlp/issues/3766) and 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

_No response_

### Example URLs

https://v.youku.com/v_show/id_XNDQ2NjE3NjMyMA==.html

### Provide a description that is worded well enough to be understood

yt-dlp does not seem to save the timestamp/date, description or comments from youku.com videos, which could be an addition to the --write-description --write-info-json etc and the file output arguments.

### Provide verbose output that clearly demonstrates the problem

- [X] Run **your** yt-dlp command with **-vU** flag added (`yt-dlp -vU <your command line>`)
- [ ] If using API, add `'verbose': True` to `YoutubeDL` params instead
- [X] Copy the WHOLE output (starting with `[debug] Command-line config`) and insert it below

### Complete Verbose Output

```shell
yt-dlp -vU --embed-metadata --embed-chapters --write-subs --write-description --write-info-json --no-clean-info-json --write-thumbnail --write-comments -o "./tmp/[%(upload_date>%Y.%m.%d)s] %(title)s [%(id)s]/%(title)s [%(id)s].%(ext)s" "https://v.youku.com/v_show/id_XNDQ2NjE3NjMyMA==.html"
[debug] Command-line config: ['-vU', '--embed-metadata', '--embed-chapters', '--write-subs', '--write-description', '--write-info-json', '--no-clean-info-json', '--write-thumbnail', '--write-comments', '-o', './tmp/[%(upload_date>%Y.%m.%d)s] %(title)s [%(id)s]/%(title)s [%(id)s].%(ext)s', 'https://v.youku.com/v_show/id_XNDQ2NjE3NjMyMA==.html']
[debug] Encodings: locale UTF-8, fs utf-8, pref UTF-8, out utf-8, error utf-8, screen utf-8
[debug] yt-dlp version stable@2023.03.04 [392389b7d] (pip)
[debug] Python 3.10.11 (CPython x86_64 64bit) - Linux-5.15.0-73-generic-x86_64-with-glibc2.31 (OpenSSL 1.1.1f  31 Mar 2020, glibc 2.31)
[debug] exe versions: ffmpeg 6.0-static (setts), ffprobe 4.2.7, phantomjs 2.1.1, rtmpdump 2.4
[debug] Optional libraries: Cryptodome-3.16.0, brotli-1.0.9, certifi-2019.11.28, mutagen-1.45.1, sqlite3-2.6.0, websockets-10.4
[debug] Proxy map: {}
[debug] Loaded 1786 extractors
[debug] Fetching release info: https://api.github.com/repos/yt-dlp/yt-dlp/releases/latest
Available version: stable@2023.03.04, Current version: stable@2023.03.04
yt-dlp is up to date (stable@2023.03.04)
[youku] Extracting URL: https://v.youku.com/v_show/id_XNDQ2NjE3NjMyMA==.html
[youku] XNDQ2NjE3NjMyMA: Retrieving cna info
[youku] XNDQ2NjE3NjMyMA: Downloading JSON metadata
[debug] Formats sorted by: hasvid, ie_pref, lang, quality, res, fps, hdr:12(7), vcodec:vp9.2(10), channels, acodec, filesize, fs_approx, tbr, vbr, abr, asr, proto, vext, aext, hasaud, source, id
[debug] Default format spec: bestvideo*+bestaudio/best
[info] XNDQ2NjE3NjMyMA: Downloading 1 format(s): h3
[info] There's no video description to write
[info] There's no subtitles for the requested languages
[info] Downloading video thumbnail 0 ...
[info] Writing video thumbnail 0 to: ./tmp/[NA] 片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA]/片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA].jpg
[info] Writing video metadata as JSON to: ./tmp/[NA] 片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA]/片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA].info.json
[debug] Invoking hlsnative downloader on "http://pl-ali.youku.com/playlist/m3u8?vid=XNDQ2NjE3NjMyMA%3D%3D&type=hd&ups_client_netip=2001x999x788xe5d3x1d7x21c7xe262xe7ad&utid=88oTHYN292gBASABCZkZJyI%2F&ccode=0524&psid=4b37ba33371678eb8626363731cd54c341346&duration=144&expire=18000&drm_type=1&drm_device=10&drm_default=1&dyt=1&ups_ts=1686953204&onOff=0&encr=0&ups_key=83ac877ef47e0c809be98fe0d301f95c&ckt=3&m_onoff=0&pn="
[hlsnative] Downloading m3u8 manifest
[hlsnative] Total fragments: 15
[download] Destination: ./tmp/[NA] 片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA]/片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA].mp4
[download] 100% of   18.37MiB in 00:00:17 at 1.02MiB/s
[debug] ffprobe command line: ffprobe -hide_banner -show_format -show_streams -print_format json 'file:./tmp/[NA] 片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA]/片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA].mp4'
[FixupM3u8] Fixing MPEG-TS in MP4 container of "./tmp/[NA] 片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA]/片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA].mp4"
[debug] ffmpeg command line: ffmpeg -y -loglevel repeat+info -i 'file:./tmp/[NA] 片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA]/片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA].mp4' -map 0 -dn -ignore_unknown -c copy -f mp4 -bsf:a aac_adtstoasc -movflags +faststart 'file:./tmp/[NA] 片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA]/片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA].temp.mp4'
[Metadata] Adding metadata to "./tmp/[NA] 片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA]/片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA].mp4"
[debug] ffmpeg command line: ffmpeg -y -loglevel repeat+info -i 'file:./tmp/[NA] 片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA]/片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA].mp4' -map 0 -dn -ignore_unknown -c copy -write_id3v1 1 -metadata 'title=片头片尾都很好听特别是片尾《三个火枪手》' -metadata purl=https://v.youku.com/v_show/id_XNDQ2NjE3NjMyMA==.html -metadata comment=https://v.youku.com/v_show/id_XNDQ2NjE3NjMyMA==.html -metadata 'artist=大鱼用户1534564543725609' -movflags +faststart 'file:./tmp/[NA] 片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA]/片头片尾都很好听特别是片尾《三个火枪手》 [XNDQ2NjE3NjMyMA].temp.mp4'
```