Add VTT vertical position support when converting from ttml #451
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Hello, team! Thanks for this awesome tool for helping us convert the subtitle format. My team is mainly working on the APAC related subtitles and we found there are some issues while converting the ttml file to VTT. One of the problem is that the output VTT file didn't include the vertical information even though the original ttml writingMode was defined the vertical subtitle in layout field. I added some configuration in VTT writer side so that when converting from ttml file, the vertical subtitle could be reserved. Thanks for reviewing and please let me know if there is any other cases we need to consider. Example screenshot below.
