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While investigating Issue: androidx/media#887 I naively assumed the CEA-608 captions were in a TS file, but they're actually in an MP4 (which is possibly obvious given DASH only supports MP4). This change includes container info in the `EventLogger` `tracks` output. PiperOrigin-RevId: 592192752 (cherry picked from commit 6853ffccae53b0f01c8a818d64ed8dc18d1c60b0)