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feat(tracks): name unnamed tracks by language and tag subtitle scripts

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Unnamed tracks get the English language name (default region left out); subtitle tags gain the script their region implies (zh-TW -> zh-Hant-TW). Refs #169
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imSp4rky
2026-10-24 10:59:21 -06:00
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docs/guide/output-and-naming.md
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@@ -284,6 +284,27 @@ warning and continues.
!!! note "Height channels"
A track with height channels is named bed.LFE.heights, such as `5.1.4`.
### Track names and language tags
When the service gives a track no name, unshackle names it with the English name of its language,
such as `English`, `Portuguese (Portugal)` or `Spanish (Latin America)`. The name leaves out the
region that is the default for the language, so `en-US` is `English` and `pt-BR` is `Portuguese`,
but `en-GB` is `English (United Kingdom)`. A name from the service is kept as is. unshackle adds the SDH, CC, Forced or Descriptive label after either name.
A subtitle in a language with more than one script gets the script from its region:
| Service tag | Tag in the file | Track name |
|-------------|-----------------|------------|
| `zh-TW` | `zh-Hant-TW` | Chinese (Traditional) |
| `zh-HK` | `zh-Hant-HK` | Chinese (Traditional, Hong Kong) |
| `zh-CN` | `zh-Hans-CN` | Chinese (Simplified) |
| `sr-ME` | `sr-Latn-ME` | Serbian (Latin, Montenegro) |
| `zh` | `zh` | Chinese |
A tag without a region, such as `zh`, gets no script because the region is what tells the script.
unshackle writes audio tags as the service gives them, because a script applies only to written text.
Track selection, `--list` tags and file names use the service tag.
### DTS:X Profile 2 output
A title whose audio holds a `dtsx` or `dtsy` sample entry (DTS:X Profile 2, DTS-UHD) muxes