[ttml2] audio - gain and mute (#1235)

btsimonh has just created a new issue for https://github.com/w3c/ttml2:

== audio - gain and mute ==
Hi all,

after discussion with Nigel, I'm adding a quick note in here as a possible user/implementer of TTML2 for audio.

Yella Umbrella would like to have tts:gain not restricted to -1 through 1, as we record audio, and allow the users to **add** gain if the recorded audio is too low.

We would also like to suggest a tta:mute attribute on the audio element which would tell presentation engines that they can effectively ignore the source (not retrieve it, save bandwidth).  The reasoning being that during authoring you may have multiple takes which the user may wish to retain, but are of no use in the final presentation.  We could use tts:gain=0, but feel something more explicit is appropriate for real implementations (and also - we wish to retain the gain parameter for the take for future possible use!).

br,

Simon Hailes

Please view or discuss this issue at https://github.com/w3c/ttml2/issues/1235 using your GitHub account


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Received on Tuesday, 8 June 2021 17:58:41 UTC