This applies the X-TIMESTAMP-MAP data to timestamps as it reads through a concatenated (merged) WebVTT file to correct timestamps on segmented WebVTT streams. It then removes the X-TIMESTAMP-MAP header.
The timescale and segment duration information is saved in the Subtitle's data dictionary under the hls/dash key: timescale (dash-only) and segment_durations. Note that this information will only be available post-download.
This is done regardless if you are converting to another subtitle or not, since the downloader automatically and forcefully concatenated the segmented subtitle data. We do not support the use of segmented Subtitles for downloading or otherwise, nor do we plan to.
* Add option for automatic subtitle character encoding normalization
The rationale behind this function is that some services use ISO-8859-1
(latin1) or Windows-1252 (CP-1252) instead of UTF-8 encoding, whether
intentionally or accidentally. Some services even stream subtitles with
malformed/mixed encoding (each segment has a different encoding).
* Remove Subtitle parameter `auto_fix_encoding`
Just always attempt to fix encoding. If the subtitle is neither UTF-8 nor CP-1252, then it should realistically error out instead of producing garbage Subtitle data anyway.
* Move Subtitle encoding fixing code out of if drm tree
* Use chardet as a last ditch effort fixing Subs, or return original data
* Move Subtitle.fix_encoding method to utilities as try_ensure_utf8
* Add Shivelight as a contributor
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Co-authored-by: rlaphoenix <[email protected]>
