support different subtitle encoding about gnomecast

[keredson]

it doesn't insist on it being utf-8. i use pycaption's detect_format() tool. sadly perfect encoding detection is impossible. (see https://stackoverflow.com/questions/436220/determine-the-encoding-of-text-in-python)

[keredson]

actually, looking at my own code, possible i might have a bug insisting on utf-8. can you post a subtitle file (that's not working) i can confirm w/?

[kparal]

Sure, download for example this one:
https://www.opensubtitles.org/cs/subtitles/4673665/the-big-bang-theory-the-date-night-variable-cs

You'll see empty rectangles instead of some characters (other characters are swapped with a completely different ones from a different alphabet, but I understand those are much harder to spot for a foreigner). The correct encoding is windows 1250 (cp1250). For example gedit's open dialog allows for selecting encoding, so that you can compare correct and incorrect rendering.

[deimidis]

I have a similar problem, and there's no option to not add subtitles (or don't check for it). I think this movie has encoded subtitles, and I have this error on console: UnicodeDecodeError: 'utf-8' codec can't decode byte 0xd1 in position 2031: invalid continuation byte

Gnomecast continue searching for subtitles and Play button is always grey

[keredson]

i've witnessed that as well @deimidis. needs better error handling for sure.

[esmin]

Warning: I know very basic python(3)
I think the simplest solution would be:
inputSubtitles.decode('codec').encode('utf8') and process further - as vtt must be utf8 this will also solve UnicodeDecodeError issues
where codec can be chosen from drop menu of builtin codecs
https://docs.python.org/3.7/library/codecs.html#standard-encodings

This is basically what VLC and other video players have, instead of trying codec autodetect.
Btw, kudos for great app