Add Support for https://app.matter.online/

[hentaiwithsenpai]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.01.24
• 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

PASTE VERBOSE LOG HERE

PS F:\New folder\IPOD TOUCH\PhoneTrans-Export-2019-12-08> youtube-dl -v --embed-thumbnail --add-metadata https://app.matter.online/tracks/12866
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '--embed-thumbnail', '--add-metadata', 'https://app.matter.online/tracks/12866']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2020.01.24
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.18362
[debug] exe versions: ffmpeg git-2019-11-26-59d264b, ffprobe git-2019-11-26-59d264b
[debug] Proxy map: {}
[generic] 12866: Requesting header
WARNING: Falling back on generic information extractor.
[generic] 12866: Downloading webpage
[generic] 12866: Extracting information
[generic] embedded: Requesting header
WARNING: Falling back on generic information extractor.
[generic] embedded: Downloading webpage
[generic] embedded: Extracting information
[download] Downloading playlist: video
[generic] playlist video: Collected 1 video ids (downloading 1 of them)
[download] Downloading video 1 of 1
[debug] Default format spec: bestvideo+bestaudio/best
[debug] Invoking downloader on 'https://matter-production.s3.amazonaws.com/audios/yH_47l6Hi0qyHe8WArAqk8Ousqf14G.mp3'
[download] video-embedded.mp3 has already been downloaded
[download] 100% of 6.06MiB
[ffmpeg] Adding metadata to 'video-embedded.mp3'
[debug] ffmpeg command line: ffmpeg -y -loglevel "repeat+info" -i "file:video-embedded.mp3" -c copy -metadata "title=video" -metadata "purl=https://api.matter.online/api/v1/open-graph/tracks/12866/embedded" "file:video-embedded.temp.mp3"
[embedthumbnail] There aren't any thumbnails to embed
[download] Finished downloading playlist: video

Description

WRITE DESCRIPTION HERE

I'm able to download the mp3 as shown in the log and it is 320kbps
my issue is that it doesn't correctly add the metadata or artwork.
It names the file as video-embeded with no artwork or metadata attached.