"451 Unavailable For Legal Reasons" instead of just HTTP_OTHER_4XX error

[Owyn]

Summary of the bug:

HTTP error code for 451 is currently missing from FFPROBE so it just returns HTTP_OTHER_4XX error for it mixing things up and making it impossible to detect when a server is returning 451 for geo-blocked content and not the old-fashioned 403 forbidden

How to reproduce:

ffprobe a geo-blocked iptv channel ( for example - ​https://strm.yandex.ru/kal/rbc/rbc0.m3u8 )

Expected result:

"Server returned 451 Unavailable For Legal Reasons"

Actual result:

"Server returned 4XX Client Error, but not one of 40{0,1,3,4}"

[Stefano Sabatini]

The result is technically correct:

$ ./ffprobe https://strm.yandex.ru/kal/rbc/rbc0.m3u8 
ffprobe version N-106633-g25d3f96db7 Copyright (c) 2007-2022 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
  configuration: --enable-openssl
  libavutil      57. 24.101 / 57. 24.101
  libavcodec     59. 26.100 / 59. 26.100
  libavformat    59. 22.100 / 59. 22.100
  libavdevice    59.  6.100 / 59.  6.100
  libavfilter     8. 33.100 /  8. 33.100
  libswscale      6.  6.100 /  6.  6.100
  libswresample   4.  6.100 /  4.  6.100
[https @ 0x55855ea32640] HTTP error 451 Unavailable For Legal Reasons
https://strm.yandex.ru/kal/rbc/rbc0.m3u8: Server returned 4XX Client Error, but not one of 40{0,1,3,4,5}

since at the end this is a 4XX error (and there is no more specific error code for HTTP 451 error, although the log from the HTTPS implementation will show the error.

What is your use case?

[Owyn]

Usecase is sorting online IPTV streams into online \ offline \ geoblocked categories and then making playlists for users based on status,

currently it counts these geoblocked streams as offline due to 4xx error incorrectly so endusers don't get those streams included into their playlists and don't get to play those iptv channels even thought they should be able to:
( ​https://github.com/iptv-org/iptv/blob/master/scripts/commands/playlist/cleaner.js#L85 )

[Stefano Sabatini]

So, if you are using it in a script I guess you are parsing the error code:

$ ./ffprobe https://strm.yandex.ru/kal/rbc/rbc0.m3u8 -show_format -show_error
ffprobe version N-106634-gbb6ef6d314 Copyright (c) 2007-2022 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
  configuration: --enable-openssl
  libavutil      57. 24.101 / 57. 24.101
  libavcodec     59. 26.100 / 59. 26.100
  libavformat    59. 22.100 / 59. 22.100
  libavdevice    59.  6.100 / 59.  6.100
  libavfilter     8. 33.100 /  8. 33.100
  libswscale      6.  6.100 /  6.  6.100
  libswresample   4.  6.100 /  4.  6.100
[https @ 0x5573b693f640] HTTP error 451 Unavailable For Legal Reasons
https://strm.yandex.ru/kal/rbc/rbc0.m3u8: Server returned 4XX Client Error, but not one of 40{0,1,3,4}
[ERROR]
code=-1482175736
string=Server returned 4XX Client Error, but not one of 40{0,1,3,4}
[/ERROR]

But then the only solution would be to add a specific error code for the 451 error.

Do you confirm?

[Owyn]

Replying to Stefano Sabatini:

But then the only solution would be to add a specific error code for the 451 error.

Do you confirm?

Yes, the result from ffprobe is being used and it doesn't give a specific error for 451, it gives 4xx instead currently.

I came here to propose to add a specific error code for the 451 error.

I confirm.