How Matching Works
Simple answer: SZ matches filenames and PMS metadata against subtitle info. Keeping the format (HDTV, WEB-DL, BluRay, etc.) is most important for correct matching.
A score of a subtitle is determined by the matching components of the media metadata (from the filename and the PMS) against the available subtitle info (depends on the provider). If your minimum movie score setting in SZ is too high and the info contained in the filename or metadata amounts to less than the score, the subtitles found on any provider won't match.
Since version 2.0 matching doesn't only rely on the filename that much, but also fills missing info from the PMS metadata. Keep in mind that if you rename your media files, please keep the format information (like HDTV, WEB-DL, BluRay, etc.).
This is the basis of the score determination for a subtitle of a movie, and this for an episode.
The more matching data between a filename/PMS metadata and a subtitle, the higher the subtitle score, and the higher the likeliness, that a subtitle is "good" for your file.
You can see how matching is done by setting SZ's log_level setting to DEBUG and studying the log files.
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