Document tvdb_api_key, tvdb_pin, tvdb_order and metadata_providers, the
--tvdb and --tvdb-order flags with their behaviour when an order does
not cover a whole series, the new REST API parameters, and the Matroska
TVDB2 tag prefixes.
sort_subtitles applied the language sort before the type sort. Python sorts
are stable, so the last pass wins and type became the major key: every forced
track, then every normal, then every SDH, each block ordered by language. In a
title with many languages this put a track far from its own SDH version, for
example Finnish at track 5 and Finnish SDH at track 42.
Add a group_by parameter that selects the major key. "type" is the default and
keeps the current order byte for byte. "language" swaps the two passes so each
language stays next to its own variants. Read it from the new subtitle.group_by
config key.
Also correct the docs: type_priority was described as sorting the variants
within each language, which was never true. It ranks the types across all
languages.
Upstream migrated the free IMDxAPI from imdbapi.dev to api.tiffara.com.
Endpoints and JSON schema are unchanged, so only BASE_URL and the
user-facing docs/docstrings needed updating.
Swap cookie/PKCE auth for the OAuth 2.0 device authorization grant with a cached rotating refresh token. Fix the connection-token key (`cat`) and move the cache to {cache}/vpn/ to match ProtonVPN.
BREAKING CHANGE: cookie-file auth removed; run once with `enable: true` to approve a device code.
Optional ranking of forced/normal/sdh per language, mirroring audio.codec_priority; first track gets the default flag, so this also picks the default subtitle. Unset = existing behavior.
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