[ttml2] Pull Request: Remove ttp:mediaDuration (#549).

skynavga has just submitted a new pull request for https://github.com/w3c/ttml2:

== Remove ttp:mediaDuration (#549). ==
Closes #549.

See https://github.com/w3c/ttml2/pull/555

Received on Sunday, 14 January 2018 07:52:26 UTC