[Feature Request] Handle WebVtt cue settings

[moi15moi]

It would be nice if pysubs2 could interpret all the cue settings: https://developer.mozilla.org/en-US/docs/Web/API/WebVTT_API#cue_settings

• vertical
• line
• position
• size
• align

This would allow to correctly convert some .ass tag into cue vtt setting and vice-versa.

[tkarabela]

I agree :) The WebVTT support is very basic at the moment.

What is more relevant for your use-case: converting existing .ass to .vtt, or getting .ass formatting out of existing .vtt files?

[moi15moi]

In my case, it would be .ass to .vtt file, but of course, .vtt to .ass is needed.

I don't know it if it can help you, but I have created an library that parse .ass tag: https://github.com/moi15moi/ass_tag_analyzer
It parse tag like VSFilter/Libass.

Here is a website to test some webvtt feature (but we can't test all the setting :/): https://ronallo.com/demos/webvtt-cue-settings/

vertical: \frz tag (I don't totally understand the difference between lr and rl)
line: Sometime the x value of \pos()
position: Sometime the y value of \pos()¸
size: There isn't really a .ass tag for this. The only way is to modify the left and the right margin, but we would need to know the text length which is not possible
align: \an or \a