Youtube get_video_info token not found

[ssikyou]

Checklist

• I'm reporting a broken site support issue
• I've verified that I'm running youtube-dl version 2019.11.28
• 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

root@localhost:~# youtube-dl -s -4 -v --print-traffic bk7613_9Ymg
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-s', '-4', '-v', '--print-traffic', 'bk7613_9Ymg']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.11.28
[debug] Python version 3.5.2 (CPython) - Linux-4.4.0-141-generic-x86_64-with-Ubuntu-16.04-xenial
[debug] exe versions: none
[debug] Proxy map: {}
[youtube] bk7613_9Ymg: Downloading webpage
send: b'GET /watch?hl=en&disable_polymer=true&bpctr=9999999999&has_verified=1&gl=US&v=bk7613_9Ymg HTTP/1.1\r\nAccept-Encoding: gzip, deflate\r\nAccept-Language: en-us,en;q=0.5\r\nAccept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\nConnection: close\r\nUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.9 Safari/537.36\r\nHost: www.youtube.com\r\nCookie: PREF=f1=50000000&hl=en\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n\r\n'
reply: 'HTTP/1.1 200 OK\r\n'
[youtube] bk7613_9Ymg: Downloading video info webpage
header: Strict-Transport-Security header: Content-Encoding header: P3P header: Cache-Control header: X-Content-Type-Options header: X-Frame-Options header: Expires header: Content-Type header: Date header: Server header: X-XSS-Protection header: Set-Cookie header: Set-Cookie header: Set-Cookie header: Set-Cookie header: Alt-Svc header: Connection header: Transfer-Encoding send: b'GET /get_video_info?hl=en&eurl=&video_id=bk7613_9Ymg&disable_polymer=true&el=embedded&ps=default&gl=US HTTP/1.1\r\nAccept-Encoding: gzip, deflate\r\nAccept-Language: en-us,en;q=0.5\r\nAccept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\nConnection: close\r\nUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.9 Safari/537.36\r\nHost: www.youtube.com\r\nCookie: PREF=f1=50000000&hl=en; YSC=T5rDAyaoNzU; s_gl=1d69aac621b2f9c0a25dade722d6e24bcwIAAABVUw==; GPS=1; VISITOR_INFO1_LIVE=yZD9bUvLd-Q\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n\r\n'
reply: 'HTTP/1.1 200 OK\r\n'
header: Expires header: P3P header: Content-Type header: Cache-Control header: Strict-Transport-Security header: X-Content-Type-Options header: X-Frame-Options header: Content-Encoding header: Date header: Server header: X-XSS-Protection header: Alt-Svc header: Connection header: Transfer-Encoding send: b'GET /get_video_info?hl=en&eurl=&video_id=bk7613_9Ymg&disable_polymer=true&el=detailpage&ps=default&gl=US HTTP/1.1\r\nAccept-Encoding: gzip, deflate\r\nAccept-Language: en-us,en;q=0.5\r\nAccept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\nConnection: close\r\nUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.9 Safari/537.36\r\nHost: www.youtube.com\r\nCookie: PREF=f1=50000000&hl=en; YSC=T5rDAyaoNzU; s_gl=1d69aac621b2f9c0a25dade722d6e24bcwIAAABVUw==; GPS=1; VISITOR_INFO1_LIVE=yZD9bUvLd-Q\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n\r\n'
reply: 'HTTP/1.1 200 OK\r\n'
header: Content-Type header: Strict-Transport-Security header: P3P header: X-Frame-Options header: Expires header: X-Content-Type-Options header: Content-Encoding header: Cache-Control header: Date header: Server header: X-XSS-Protection header: Alt-Svc header: Connection header: Transfer-Encoding send: b'GET /get_video_info?hl=en&eurl=&video_id=bk7613_9Ymg&disable_polymer=true&el=vevo&ps=default&gl=US HTTP/1.1\r\nAccept-Encoding: gzip, deflate\r\nAccept-Language: en-us,en;q=0.5\r\nAccept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\nConnection: close\r\nUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.9 Safari/537.36\r\nHost: www.youtube.com\r\nCookie: PREF=f1=50000000&hl=en; YSC=T5rDAyaoNzU; s_gl=1d69aac621b2f9c0a25dade722d6e24bcwIAAABVUw==; GPS=1; VISITOR_INFO1_LIVE=yZD9bUvLd-Q\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n\r\n'
reply: 'HTTP/1.1 200 OK\r\n'
header: Expires header: Cache-Control header: Strict-Transport-Security header: X-Frame-Options header: Content-Type header: X-Content-Type-Options header: Content-Encoding header: P3P header: Date header: Server header: X-XSS-Protection header: Alt-Svc header: Connection header: Transfer-Encoding send: b'GET /get_video_info?hl=en&eurl=&video_id=bk7613_9Ymg&disable_polymer=true&ps=default&gl=US HTTP/1.1\r\nAccept-Encoding: gzip, deflate\r\nAccept-Language: en-us,en;q=0.5\r\nAccept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\nConnection: close\r\nUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.9 Safari/537.36\r\nHost: www.youtube.com\r\nCookie: PREF=f1=50000000&hl=en; YSC=T5rDAyaoNzU; s_gl=1d69aac621b2f9c0a25dade722d6e24bcwIAAABVUw==; GPS=1; VISITOR_INFO1_LIVE=yZD9bUvLd-Q\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n\r\n'
reply: 'HTTP/1.1 200 OK\r\n'
[debug] Default format spec: bestvideo+bestaudio/best
header: X-Content-Type-Options header: X-Frame-Options header: Expires header: Cache-Control header: Content-Type header: Content-Encoding header: Strict-Transport-Security header: P3P header: Date header: Server header: X-XSS-Protection header: Alt-Svc header: Connection header: Transfer-Encoding

Description

Does youtube change the get_video_info schema? It seems youtube-dl will request get_video_info four times to get the video info, is it the correct behavior?
BTW, I checked the code, it seems the "token" is not found, so a for loop is not breaked correctly.

                for el in ('embedded', 'detailpage', 'vevo', ''):
...
                    get_token = extract_token(get_video_info)
                    if get_token:
                        # Different get_video_info requests may report different results, e.g.
                        # some may report video unavailability, but some may serve it without
                        # any complaint (see https://github.com/ytdl-org/youtube-dl/issues/7362,
                        # the original webpage as well as el=info and el=embedded get_video_info
                        # requests report video unavailability due to geo restriction while
                        # el=detailpage succeeds and returns valid data). This is probably
                        # due to YouTube measures against IP ranges of hosting providers.
                        # Working around by preferring the first succeeded video_info containing
                        # the token if no such video_info yet was found.
                        token = extract_token(video_info)
                        if not token:
                            video_info = get_video_info
                        break