We had a look at the developer page and it looks like most of the formats are covered in the 4k profile. Files encoded in VP8 are not very common, usually VP8 or VP9 is used as a format for transcoding rather than a native format to support. We have only been able to get WebVTT subtitles to work. Mezzmo transcodes other text based subtitle formats to webVTT on the fly so any SRT files will be transcoded to webVTT seamlessly.
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