Filter Seen Movies
Prevents movies being downloaded twice. Works only on entries which have imdb_url available, if imdb_url is already not present imdb lookup will be tried.
How duplicate movie detection works:
- Remember all imdb urls from downloaded entries.
- If stored imdb url appears again, entry is rejected.
There are two different operating modes, strict and loose.
Strict mode will reject all movies that are not imdb-compatible. Loose mode will not intervene them.