jbibik 97efa70852 Add DASH support for parsing standalone TTML files during extraction
This change applies to standalone TTML files linked directly from the manifest.

As a result, we no longer have the flakiness in the DashPlaybackTest which uses sidecar-loaded (standalone file) TTML subtitles. We experimentally opt into parsing subtitles during extraction and use SubtitleExtractor in hybrid mode.

PiperOrigin-RevId: 577457256
2023-10-28 06:59:45 -07:00
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