Hi there,

There is no filter that yo can add to /now_playing but, now playing is just a discover query behind the scenes so you can definitely create your own custom query with discover. You can check out the docs for discover here. Discover of course supports the with_original_language filter.

So if I am trying to load a list of "Now Playing" list of movies in theaters and only wish to display the U.S. movies with original language en , does it make more sense to make that call through "Now Playing" or through "Discover"

I would do it through discover. Something like this:

http://api.themoviedb.org/3/discover/movie?api_key=###&release_date.gte=2018-08-01&release_date.lte=2018-08-24&region=US&with_release_type=3|2&with_original_language=en

1. release_date.gte: Only include movies released since and including Aug. 1
2. release_date.lte: Only include movies released before and including today (Aug. 24)
3. region: US
4. with_release_type: Theatrical OR limited theatrical release dates, but prefer theatrical (3 is first)
5. with_original_language: Only include movies marked with primary language of English

I guess the tricky part is finding a way to update the date field automatically... Since the Now Playing API auto updates , and I am trying to make a discover call function as a Now Playing call, then that means I have to figure out how to update the release_date.gte and the release_date.lte fields automatically within the call. Is this a correct assumption ? If it is, then, out of curiosity, since you said the Now Playing call is really just a discover call behind the scenes, what logic did you use for the the release_date.gte and the release_date.lte date fields, are using a span of movies released within 4 weeks of "today" or something like that?

If it is, then, out of curiosity, since you said the Now Playing call is really just a discover call behind the scenes, what logic did you use for the the release_date.gte and the release_date.lte date fields, are using a span of movies released within 4 weeks of "today" or something like that?

Correct. I base my (6 week span I think) starting on Wednesdays and choose the proper weeks from there.

I was going to add a filter to only include movies that are greater than 50 minutes runtime so I can remove some unpopular movies that have 0hr/0min from showing... but then I noticed a popular movie ("Kin") was missing when I did this. Why do some movies show 0 hours and 0 minutes, even though they have that information public already? For example the Movie "Kin" (https://www.themoviedb.org/movie/425505-kin) shows 0/0 in the object but if I google it to check online it shows 1Hr 42Min.

Why do some movies show 0 hours and 0 minutes, even though they have that information public already?

TMDb is a crowd sourced database so there will be times when no one has entered the data yet. In this case, the runtime for Kin has not been added. You can head in and add a runtime if you wish.