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### Describe the bug
The subtitle does not show on Exoplayer and External Player when external subtitle format is SAMI(*.smi, *.sami).
https://github.com/jellyfin/jellyfin-android/blob/f1f78994696…
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I want to explore the use of edit lists of TTML in MP4 (and WebVTT in MP4).
### Reminder on edit lists
As defined in 14496-12, a track has:
* a decode timeline. Each sample has a decode time on…
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### Issue description
**Observed**: MP4-Encapsulated TTML subtitles default to top position (with `positionAnchor` defaulting to Float.MIN_VALUE)
**Expected**: Subtitles appear at the bottom of the …
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https://github.com/w3c/imsc-tests/blob/e0213a2815dd4690c1458550adabc458f09a7d77/imsc1_1/ttml/position/position003.ttml#L32
https://github.com/w3c/imsc-tests/blob/e0213a2815dd4690c1458550adabc458f09…
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The following snippet triggers _[E]:[9,64]:Invalid {http://www.w3.org/ns/ttml#parameter}profile value 'http://www.w3.org/ns/ttml/profile/imsc1/text'._ when validated against the IMSC 1.1 model.
```…
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RFC6381 defines MIME type parameters "codecs" and "profiles" for ISO BMFF-wrapped content. We are defining "codecs" for "application/ttml+xml". We should clarify in the TTML IANA registration text so …
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As discussed at TPAC, the requirement is to add sequence handling functionality to align with the [EBU-TT Part 3](https://tech.ebu.ch/publications/tech3370) specification's timing resolution semantics…
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Specifying `ttp:profile="http://www.w3.org/ns/ttml/profile/imsc1/text"` on `tt` yields the following error message when using the `ttml2` or `ttml1` models:
`Invalid {http://www.w3.org/ns/ttml#para…
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## Checklist
- [x] I'm reporting a broken site support
- [x] I've verified that I'm running youtube-dl version **2021.06.06**
- [x] I've checked that all provided URLs are alive and pla…
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Hi,
i got this error
```
$ python3 ttml2srt.py Doctor\ Who:\ Unleashed\,\ 60th\ Anniversary\ Specials\,\ Wild\ Blue\ Yonder\ \[m001t439\].en.ttml Doctor\ Who:\ Unleashed\,\ 60th\ Anniversary\ S…