- From DASH spec 2014, MPD@publishTime and Period@id are required for
'dynamic' MPD.
- Period@id is always set to "0".
- MPD@publishTime is set to the time when the MPD is output.
Issue #55
Change-Id: I5e50aa11067176e69a2343fbc82ca42129703e1b
Added packager tests for WebM audio. Also now only outputs the
language if it's not empty. Fixed the packager tests for that.
b/26540606
Change-Id: Ica804bd710055bcaa2113f948d723dedd78ef909