Repository: yt-dlp
Issue: Videos on CCTV.com only download 270p
Labels: site-bug,patch-available

### 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 reporting a new site support request
- [X] I've verified that I have **updated yt-dlp to nightly or master** ([update instructions](https://github.com/yt-dlp/yt-dlp#update-channels))
- [X] I've checked that all provided URLs are playable in a browser with the same IP and same login details
- [X] I've checked that none of provided URLs [violate any copyrights](https://github.com/yt-dlp/yt-dlp/blob/master/CONTRIBUTING.md#is-the-website-primarily-used-for-piracy) or contain any [DRM](https://en.wikipedia.org/wiki/Digital_rights_management) to the best of my knowledge
- [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)
- [ ] 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 am willing to share it if required

### Region

China

### Example URLs

https://tv.cctv.com/2024/05/31/VIDEK4FKgdmofTTqOwGlGffy240531.shtml

### Provide a description that is worded well enough to be understood

Videos on CCTV.com only download 270p

### 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
C:\WINDOWS\system32>yt-dlp -vU "https://tv.cctv.com/2024/05/31/VIDEK4FKgdmofTTqOwGlGffy240531.shtml"
[debug] Command-line config: ['-vU', 'https://tv.cctv.com/2024/05/31/VIDEK4FKgdmofTTqOwGlGffy240531.shtml']
[debug] Encodings: locale cp950, fs utf-8, pref cp950, out utf-8, error utf-8, screen utf-8
[debug] yt-dlp version stable@2024.05.27 from yt-dlp/yt-dlp [12b248ce6] (win_x86_exe)
[debug] Python 3.8.10 (CPython AMD64 32bit) - Windows-10-10.0.19045-SP0 (OpenSSL 1.1.1k  25 Mar 2021)
[debug] exe versions: ffmpeg N-102618-ge41255cddb (setts), ffprobe 6.0-essentials_build-www.gyan.dev
[debug] Optional libraries: Cryptodome-3.20.0, brotli-1.1.0, certifi-2024.02.02, mutagen-1.47.0, requests-2.32.2, sqlite3-3.35.5, urllib3-2.2.1, websockets-12.0
[debug] Proxy map: {}
[debug] Request Handlers: urllib, requests, websockets
[debug] Loaded 1820 extractors
[debug] Fetching release info: https://api.github.com/repos/yt-dlp/yt-dlp/releases/latest
Latest version: stable@2024.05.27 from yt-dlp/yt-dlp
yt-dlp is up to date (stable@2024.05.27 from yt-dlp/yt-dlp)
[CCTV] Extracting URL: https://tv.cctv.com/2024/05/31/VIDEK4FKgdmofTTqOwGlGffy240531.shtml
[CCTV] VIDEK4FKgdmofTTqOwGlGffy240531: Downloading webpage
[CCTV] 5f2b782a34e345d3a809ff67308f6e63: Downloading JSON metadata
[CCTV] 5f2b782a34e345d3a809ff67308f6e63: Downloading m3u8 information
[debug] Formats sorted by: hasvid, ie_pref, lang, quality, res, fps, hdr:12(7), vcodec:vp9.2(10), channels, acodec, size, br, asr, proto, vext, aext, hasaud, source, id
[debug] Default format spec: bestvideo*+bestaudio/best
[info] 5f2b782a34e345d3a809ff67308f6e63: Downloading 1 format(s): hls-460
[debug] Invoking hlsnative downloader on "https://hls.cntv.cdn20.com/asp/hls/450/0303000a/3/default/5f2b782a34e345d3a809ff67308f6e63/450.m3u8"
[hlsnative] Downloading m3u8 manifest
[hlsnative] Total fragments: 153
[download] Destination: 《海峡两岸》 20240531 [5f2b782a34e345d3a809ff67308f6e63].mp4
[debug] File locking is not supported. Proceeding without locking
[download]  26.8% of ~  90.64MiB at    5.25MiB/s ETA 00:14 (frag 42/153)
```