unable to extract channel id

[fpaolo63]

Checklist

• I'm reporting a broken site support issue
• [ x] I've verified that I'm running youtube-dl version 2019.04.30
• I've checked that all provided URLs are alive and playable in a browser
• [ x] 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

PASTE VERBOSE LOG HERE

youtube-dl --verbose -f18 https://www.youtube.com/watch?v=GRZaxsTeV8A
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--verbose', u'-f18', u'https://www.youtube.com/watch?v=GRZaxsTeV8A']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.04.30
[debug] Python version 2.7.15rc1 (CPython) - Linux-4.18.0-18-generic-x86_64-with-Ubuntu-18.04-bionic
[debug] exe versions: ffmpeg 3.4.6, ffprobe 3.4.6
[debug] Proxy map: {}
[youtube] GRZaxsTeV8A: Downloading webpage
[youtube] GRZaxsTeV8A: Downloading video info webpage
WARNING: unable to extract channel id; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see https://yt-dl.org/update on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
[youtube] GRZaxsTeV8A: Downloading MPD manifest
[debug] Invoking downloader on u'https://r2---sn-hpa7znsk.googlevideo.com/videoplayback?id=o-ACnLb3qKRAXn2c9U-i1PO23JknPWGwJCCVfuzYjpFrbE&itag=18&source=youtube&requiressl=yes&mm=31%2C29&mn=sn-hpa7znsk%2Csn-nx5cvox-hpay&ms=au%2Crdu&mv=m&pl=16&nh=%2CEAI&ei=LTrTXJT8Mpje1wKPy4DwDQ&initcwndbps=770000&mime=video%2Fmp4&gir=yes&clen=14169212&ratebypass=yes&dur=321.155&lmt=1554863043163456&mt=1557346762&fvip=10&c=WEB&txp=2211222&ip=79.54.30.57&ipbits=0&expire=1557368462&sparams=ip%2Cipbits%2Cexpire%2Cid%2Citag%2Csource%2Crequiressl%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Cnh%2Cei%2Cinitcwndbps%2Cmime%2Cgir%2Cclen%2Cratebypass%2Cdur%2Clmt&signature=5888F60AA63BEFB1F2FC3156416E001A98DDF7C1.B4A1F41944B9DDF049CAD1E8EF9B2E2AB263EEE6&key=yt8'
[download] Let's build some test parts!-GRZaxsTeV8A.mp4 has already been downloaded
[download] 100% of 13.51MiB

Description

WRITE DESCRIPTION HERE
WARNING: unable to extract channel id; please report this issue on https://yt-dl.org/bug .