TMDb already has fallback logic built-in (for all requests, not just for trailers). If there isn't a result for your specific locale, TMDb tries to return something from a similar one. We shouldn't be re-engineering this IMO.

Also, it's the same experience if you browse the actual TMDb website. If there is no trailer in your language, the "Play Trailer" option simply does not appear.

Also, the fallback display language for Overseerr is English because it is the language of our source strings; no other language is guaranteed to be completely translated. Allowing specification of a different fallback language would result in weird UX where there are potentially three different languages shown to the user.

So TMDb should already have given the english trailer in the example that prompted me to open this issue?

My example was the movie „I am all girls“ where there is no german trailer but an english one at the time of writing.

@cpt-kuesel TMDb has logic to fall back to other languages/locales that isn't under our control. They do fall back to English for some things, but not for trailers. (I think for more "critical" fields like titles, they always return something rather than nothing... returning the English title first and, if even that is unavailable, the title in another language.)

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I would like to work on this feature since my mother tongue is Mandarin but almost all of the movies and tv shows don't have its trailer, which is quite frustrating, @TheCatLady wondering if you any other thought on the idea of adding fallback language for trailer

@yueyingjuesha Please see my comments above. IMO, this is something that should be handled on the TMDb side.

@TheCatLady It looks like TMDb is already doing this. See this movie [1]. I can see the trailer on their website for Romanian language, but sadly I can't see the trailer in Overserr.

Not sure if the TMDb returns the trailer data when the Romanian details are requested.

I think that the problem is that Overserr is using the following API to get the related video from TMDb

GET https://api.themoviedb.org/3/movie/558449/videos?language=ro-RO

and this API returns an empty list. The API for English returns the videos requested

https://api.themoviedb.org/3/movie/558449/videos?language=en-US

I thin it is safe to assume that, if you have a different language than EN and the related videos list is empty in TMDb, Overserr can do a second call to get the English version of them.

[1] https://www.themoviedb.org/movie/558449-gladiator-ii?language=ro

Well, I created a PR for this #4009