[ttml2] No restriction on time expression for smpte discontinuous mode

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[ttml2] No restriction on time expression for smpte discontinuous mode

r12a via GitHub
nigelmegitt has just created a new issue for
https://github.com/w3c/ttml2:

== No restriction on time expression for smpte discontinuous mode ==
When `ttp:timeBase="smpte"` and `ttp:markerMode="discontinuous"` it is
 clear that calculations shall not be done on time expressions and
they cannot be converted to real times, however there's no restriction
 that the time expressions shall use clock time with frames (i.e. the
form "hh:mm:ss:ff"), and there's no explanation for how any
alternative time expression should be related back into a smpte
timecode.

https://w3c.github.io/ttml2/spec/ttml2.html#timing-time-value-expressions


Please view or discuss this issue at
https://github.com/w3c/ttml2/issues/161 using your GitHub account