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TTXV returns:
_ [E]:{file:/C:/bin/ttxv/myfile.ttml}:[1,1]:Content is not allowed in prolog._
The file starts with a BOM mark followed by:
```
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# length-cell is forbidden, but can't "c" coordinates be readily be converted to percentage coordinates by merely dividing the horizontal (vertical) component by the number of cells in the horizontal …
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The addition of ittp:aspectRatio [1] to IMSC1 was specifically requested to support display of the same caption over multiple aspect ratio versions of the same content.
Can't this be supported in Web…
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The syntax and semantics of `ttp:activeArea` do not match those of `ittp:activeArea` defined in [IMSC 1.0.1](https://www.w3.org/TR/ttml-imsc1.0.1/), even though they fulfill the same use case and have…
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I'm preparing a script to add IMSC1 ('im1t') subtitles to any mezzanine stream.
It would add 2 things:
- Subtitles displaying a rectangle in the top right corner, flashing in sync with the flash in…
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### Use Case Description ###
From @nicoweilelemental
> Image-based subtitles tracks
For workflow reasons and charset reasons, some content owners don't include text-based subtitles in the live chan…
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When there is a validation error, it can stall with that status. I observe that it seems to be when a namespace shortcut is misspelled, e.g. "ts:" instead of "tts:".
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While finalizing TTML2, we postponed some of the features regarding Japanese support to a next version as they were considered edge cases. We should revisit those for TTML.next. This includes:
- line…
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For the following EBU-TT-D file [untertitel-36573.xml](https://github.com/sandflow/imscJS/files/3496169/untertitel-36573.xml.txt) (please rename to .xml), the resulting ISD timecodes are in some cases…
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When tts:textShadow has a negative X axis direction, the shadow will cover the preceding text.
![image](https://user-images.githubusercontent.com/20539371/48078497-6cb9d300-e19e-11e8-81c0-0df07e93d…