Direct download link not giving the chosen format

[Knocks83]

Checklist

• I'm reporting a broken site support issue
• I've verified that I'm running youtube-dl version 2021.03.03
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar bug reports including closed ones
• I've read bugs section in FAQ

Verbose log

// Getting the available formats
youtube-dl -v -F https://www.pornhub.com/view_video.php?viewkey=...

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '-F', 'https://www.pornhub.com/view_video.php?viewkey=...']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2021.01.08
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.19041
[debug] exe versions: ffmpeg 2021-01-09-git-2e2891383e-full_build-www.gyan.dev, ffprobe 2021-01-09-git-2e2891383e-full_build-www.gyan.dev
[debug] Proxy map: {}
[PornHub] ph...: Downloading pc webpage
[PornHub] ph...: Downloading m3u8 information
[PornHub] ph...: Downloading m3u8 information
[PornHub] ph...: Downloading m3u8 information
[info] Available formats for ph...:
format code  extension      resolution note
0            unknown_video  unknown
240p         mp4            240p        400k
hls-505-0    mp4            854x480     505k , avc1.64001f, 60.0fps, mp4a.40.2
hls-505-1    mp4            854x480     505k , avc1.64001f, 60.0fps, mp4a.40.2
hls-953-0    mp4            1280x720    953k , avc1.640020, 60.0fps, mp4a.40.2
hls-953-1    mp4            1280x720    953k , avc1.640020, 60.0fps, mp4a.40.2 (best)


// Trying to get the direct link with the specified format
youtube-dl -v -f mp4 --get-url https://www.pornhub.com/view_video.php?viewkey=...

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '-f', 'mp4', '--get-url', 'https://www.pornhub.com/view_video.php?viewkey=...']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2021.01.08
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.19041
[debug] exe versions: ffmpeg 2021-01-09-git-2e2891383e-full_build-www.gyan.dev, ffprobe 2021-01-09-git-2e2891383e-full_build-www.gyan.dev
[debug] Proxy map: {}
https://cv-h.phncdn.com/hls/videos/...,720P_4000K,480P_2000K,_356003342.mp4.urlset/index-f1-v1-a1.m3u8?...

Description

I need to get a direct download link from both PornHub and XNXX with a specific format but when I try giving them a format that I want it'll give me an m3u8 file instead.

Eg.
This command: youtube-dl -v -f mp4 --get-url https://www.pornhub.com/view_video.php?viewkey=...
Gives this output: https://cv-h.phncdn.com/.../index-f1-v1-a1.m3u8
The output isn't an mp4 link, even if in the formats it's listed as MP4.

[dstftw]

You must select proper protocol in format selection.