can't extract video from vbox7

[NaskoM]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.12.29
• 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 issues including closed ones

Verbose log

youtube-dl -F --verb "https://www.vbox7.com/play:21871a4a85"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-F', u'--verb', u'https://www.vbox7.com/play:21871a4a85']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.12.29
[debug] Python version 2.7.18 (CPython) - Linux-5.4.0-56-generic-x86_64-with-Ubuntu-20.04-focal
[debug] exe versions: ffmpeg 4.2.4, ffprobe 4.2.4, rtmpdump 2.4
[debug] Proxy map: {}
[debug] Using fake IP 95.42.118.216 (BG) as X-Forwarded-For.
[Vbox7] 21871a4a85: Downloading JSON metadata
[Vbox7] 21871a4a85: Downloading webpage
WARNING: unable to extract JSON-LD ; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
WARNING: unable to extract thumbnail URL; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
[info] Available formats for 21871a4a85:
format code  extension  resolution note
0            mpd        unknown

Description

your tool is awesome !
however I am not able to extract this video from vbox7. latest version is installed .
Would appreciate if you fix this problem please.