[bbc.co.uk] Try all possible mediaselectors even if one succeeds

[dirkf]

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  Why isn't there tool for that in the repo? ...

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Some mediaselectors may be parseable but have no formats (eg captions only), eg https://www.bbc.co.uk/iplayer/episode/b0b3px4q.

This revision tries all possible mediaselectors and assembles the formats and subtitles found.

If any formats are found, the known exceptions ('notukerror', 'geolocation', 'selectionunavailable') are not propagated.

Should help with #23933.

Is there any need to try to de-duplicate formats?

[dirkf]

I wrote:

Is there any need to try to de-duplicate formats?

No, because code in extractor/common.py sorts and de-duplicates.

[wrhwebmaster]

I tried the latest Windows EXE (on OS=Win10).
youtube-dl.exe -U
youtube-dl is up-to-date (2020.09.20)

youtube-dl.exe --verbose https://www.bbc.com/news/av/embed/p08fvzqq/52900486
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--verbose', 'https://www.bbc.com/news/av/embed/p08fvzqq/52900486']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2020.09.20
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.18362
[debug] exe versions: ffmpeg git-2020-05-15-b18fd2b
[debug] Proxy map: {}
[bbc] 52900486: Downloading webpage
[bbc] p08fvzqq: Downloading media selection XML
ERROR: No video formats found; 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.
Traceback (most recent call last):
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpksi3o1r1\build\youtube_dl\YoutubeDL.py", line 797, in extract_info
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpksi3o1r1\build\youtube_dl\extractor\common.py", line 532, in extract
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpksi3o1r1\build\youtube_dl\extractor\bbc.py", line 937, in _real_extract
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpksi3o1r1\build\youtube_dl\extractor\common.py", line 1359, in _sort_formats
youtube_dl.utils.ExtractorError: No video formats found; 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.

[dirkf]

At least from the UK, use this URL instead: https://www.bbc.co.uk/programmes/p08fvzq
This issue isn't fixed by the current PR.

[dirkf]

This patch has been successfully deployed to a set of Linux-based settop boxes since the PR was created.