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Support for TTML as source file text format #584

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teb opened this issue Apr 23, 2019 · 4 comments
Open

Support for TTML as source file text format #584

teb opened this issue Apr 23, 2019 · 4 comments
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type: enhancement New feature or request
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Backlog

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@teb
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teb commented Apr 23, 2019

Are there any plans on adding TTML based subtitles as allowed input format for DASH and HLS any time soon ? (DVB-TT, SMPTE-TT, EBU-TT, IMSC1 or raw TTML) ?
@kqyang
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kqyang commented Apr 23, 2019

TTML passthrough is supported for DASH. For TTML output in iso-bmff, please follow this issue: #87.
@teb
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teb commented Apr 23, 2019 •
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TTML passthrough is supported for DASH. For TTML output in iso-bmff, please follow this issue: #87.

What about TTML in and WEBVTT out for HLS ? or alternatively TTML in and IMSC1 out for HLSv7+?
@kqyang
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kqyang commented Apr 23, 2019

What about TTML in and WEBVTT out for HLS ?

That is not supported right now.

or alternatively TTML in and IMSC1 out for HLSv7+?

HLS requires TTML / IMSC1 in iso-bmff, which can be addressed by #87.
@TheModMaker TheModMaker added type: enhancement New feature or request and removed needs triage labels Dec 9, 2020
@shaka-bot shaka-bot added this to the Backlog milestone Dec 9, 2020
@unext-wendong
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@kqyang

Regarding the TTML text input support:

HLS requires TTML / IMSC1 in iso-bmff, which can be addressed by #87.

It seems #87 has already been resolved. However the limitations on TTML text input support for HLS still seem to be in place.

shaka-packager/packager/packager.cc

Line 555 in 634af65

"HLS does not support TTML in xml format.");

shaka-packager/packager/packager.cc

Line 565 in 634af65

"Converting TTML to other formats is not supported");

Could you please confirm if there is anything else left that blocks the removal of these limitations?
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Labels
type: enhancement New feature or request
5 participants
@teb @TheModMaker @kqyang @shaka-bot @unext-wendong