ITV some subtitles are unable to be downloaded

[suFDHAI78fyw78q09Y98yfd]

Checklist

• [ x] I'm reporting a broken site support
• [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
• [x ] I've searched the bugtracker for similar issues including closed ones

Verbose log

youtube-dl.exe --geo-bypass-country "GB" --ignore-config -v --all-subs --sub-format "vtt" --sub-lang "en" --fixup "never" -f "best" "https://www.itv.com/hub/the-sweeney/672930"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--geo-bypass-country', 'GB', '--ignore-config', '-v
', '--all-subs', '--sub-format', 'vtt', '--sub-lang', 'en', '--fixup', 'never',
'-f', 'best', 'https://www.itv.com/hub/the-sweeney/672930']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2019.04.30
[debug] Python version 3.4.4 (CPython) - Windows-XP-5.1.2600-SP3
[debug] exe versions: ffmpeg N-91691-g962c931-Reino, ffprobe N-91691-g962c931-Re
ino, rtmpdump 2.4
[debug] Proxy map: {}
[debug] Using fake IP 25.104.135.36 (GB) as X-Forwarded-For.
[ITV] 672930: Downloading webpage
[ITV] 672930: Downloading XML
WARNING: Unable to download XML: HTTP Error 504: Gateway Time-out
[ITV] 672930: Downloading JSON metadata
[ITV] 672930: Downloading m3u8 information
[info] Writing video subtitles to: Queen's Pawn-672930.en.vtt
WARNING: Unable to download subtitle for "en": Unable to download webpage: HTTP
Error 404: Not Found (caused by HTTPError()); 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.
[debug] Invoking downloader on 'https://itvpnpdotcom-a.akamaihd.net/1-7442-0005-
001/18/6/VAR012/1-7442-0005-001_18_6_VAR012.ism/1-7442-0005-001_18_6_VAR012-audi
o=128000-video=1451810.m3u8'
[hlsnative] Downloading m3u8 manifest
[hlsnative] Total fragments: 248
[download] Destination: Queen's Pawn-672930.mp4
[download]   2.2% of ~562.00MiB at  3.02MiB/s ETA 07:19
ERROR: Interrupted by user

%%%%%%%%%%%%%%%%%

Without --all-subs command

youtube-dl.exe --geo-bypass-country "GB" --ignore-config -v --sub-format "vtt" --sub-lang "en" --fixup "never" -f "best" "https://www.itv.com/hub/the-sweeney/672930"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--geo-bypass-country', 'GB', '--ignore-config', '-v
', '--sub-format', 'vtt', '--sub-lang', 'en', '--fixup', 'never', '-f', 'best',
'https://www.itv.com/hub/the-sweeney/672930']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2019.04.30
[debug] Python version 3.4.4 (CPython) - Windows-XP-5.1.2600-SP3
[debug] exe versions: ffmpeg N-91691-g962c931-Reino, ffprobe N-91691-g962c931-Re
ino, rtmpdump 2.4
[debug] Proxy map: {}
[debug] Using fake IP 25.195.142.112 (GB) as X-Forwarded-For.
[ITV] 672930: Downloading webpage
[ITV] 672930: Downloading XML
WARNING: Unable to download XML: HTTP Error 504: Gateway Time-out
[ITV] 672930: Downloading JSON metadata
[ITV] 672930: Downloading m3u8 information
[debug] Invoking downloader on 'https://itvpnpdotcom-a.akamaihd.net/1-7442-0005-
001/18/6/VAR012/1-7442-0005-001_18_6_VAR012.ism/1-7442-0005-001_18_6_VAR012-audi
o=128000-video=1451810.m3u8'
[hlsnative] Downloading m3u8 manifest
[hlsnative] Total fragments: 248
[download] Destination: Queen's Pawn-672930.mp4
[download]   2.8% of ~564.15MiB at  2.15MiB/s ETA 06:49
ERROR: Interrupted by user


%%%%%%%%%%%%%%%%%

Without --sub-format "vtt" command"


youtube-dl.exe --geo-bypass-country "GB" --ignore-config -v --all-subs --sub-lang "en" --fixup "never" -f "best" "https://www.itv.com/hub/the-sweeney/672930"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--geo-bypass-country', 'GB', '--ignore-config', '-v', '--all-subs', '--sub-lang', 'en', '--fixup', 'never', '-f', 'best', 'https://www.itv.com/hub/the-sweeney/672930']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2019.04.30
[debug] Python version 3.4.4 (CPython) - Windows-XP-5.1.2600-SP3
[debug] exe versions: ffmpeg N-91691-g962c931-Reino, ffprobe N-91691-g962c931-Re
ino, rtmpdump 2.4
[debug] Proxy map: {}
[debug] Using fake IP 25.90.122.58 (GB) as X-Forwarded-For.
[ITV] 672930: Downloading webpage
[ITV] 672930: Downloading XML
WARNING: Unable to download XML: HTTP Error 504: Gateway Time-out
[ITV] 672930: Downloading JSON metadata
[ITV] 672930: Downloading m3u8 information
[info] Writing video subtitles to: Queen's Pawn-672930.en.vtt
WARNING: Unable to download subtitle for "en": Unable to download webpage: HTTP
Error 404: Not Found (caused by HTTPError()); 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.
[debug] Invoking downloader on 'https://itvpnpdotcom-a.akamaihd.net/1-7442-0005-
001/18/6/VAR012/1-7442-0005-001_18_6_VAR012.ism/1-7442-0005-001_18_6_VAR012-audi
o=128000-video=1451810.m3u8'
[hlsnative] Downloading m3u8 manifest
[hlsnative] Total fragments: 248
[download] Destination: Queen's Pawn-672930.mp4
[download]   3.2% of ~566.74MiB at  2.05MiB/s ETA 05:36
ERROR: Interrupted by user

%%%%%%%%%%%%%%%%%%

With --all-subs command only

youtube-dl.exe --geo-bypass-country "GB" --ignore-config -v --all-subs --fixup "never" -f "best" "https://www.itv.com/hub/the-sweeney/672930"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--geo-bypass-country', 'GB', '--ignore-config', '-v
', '--all-subs', '--fixup', 'never', '-f', 'best', 'https://www.itv.com/hub/the-
sweeney/672930']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2019.04.30
[debug] Python version 3.4.4 (CPython) - Windows-XP-5.1.2600-SP3
[debug] exe versions: ffmpeg N-91691-g962c931-Reino, ffprobe N-91691-g962c931-Re
ino, rtmpdump 2.4
[debug] Proxy map: {}
[debug] Using fake IP 25.218.116.216 (GB) as X-Forwarded-For.
[ITV] 672930: Downloading webpage
[ITV] 672930: Downloading XML
WARNING: Unable to download XML: HTTP Error 504: Gateway Time-out
[ITV] 672930: Downloading JSON metadata
[ITV] 672930: Downloading m3u8 information
[info] Writing video subtitles to: Queen's Pawn-672930.en.vtt
WARNING: Unable to download subtitle for "en": Unable to download webpage: HTTP
Error 404: Not Found (caused by HTTPError()); 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.
[debug] Invoking downloader on 'https://itvpnpdotcom-a.akamaihd.net/1-7442-0005-
001/18/6/VAR012/1-7442-0005-001_18_6_VAR012.ism/1-7442-0005-001_18_6_VAR012-audi
o=128000-video=1451810.m3u8'
[hlsnative] Downloading m3u8 manifest
[hlsnative] Total fragments: 248
[download] Destination: Queen's Pawn-672930.mp4
[download]   1.8% of ~551.02MiB at  2.08MiB/s ETA 06:44
ERROR: Interrupted by user

Description

Subtitles for some videos available but are unable to be downloaded.

A few debugs above for different commands I have tried to get the subs.

Each of the above debugs are separated by %%%%%%%%%%%%%%%%% with comment below each to explain each debug tried.

[remitamine]

the web player loads an empty subtitle file.

[suFDHAI78fyw78q09Y98yfd]

Happens with other broadcasters also. File server cause bug in one of the server side code or scripts !