Je choisis quelques films à regarder

Question

I understood that choisir took de when followed by a verb, not àOddly WRF and Larousse don't offer an opinion, but if you ask the internet it is clear that de is correct.

Maarten Kamp · Accepted Answer

i. I. 
‘ à faire ‘ is a qualifier of the noun ‘ films ‘ here. It could have been ‘ Films à regarder, films à discuter, films à èviter etc etc ‘ 
It is not a grammatical part of the verbal structure of ‘ choisir (qqc) ‘ nor is this structure  ‘ choisir de faire (qqc) ‘. In the sentence the verb could also be different ‘ Je connais/recherche quelques films à regarder ‘ or for example ‘ je me souviens de certains films à regarder ‘.
The construct ‘ Noun  à verb infinitive ‘ is a common structure in French used to describe the ‘ function ‘ or ‘ purpose ‘ of something, what it is ‘ intended for ‘. 
The most directly relevant example in the lesson below is ‘ pomme à cuire ‘
https://progress.lawlessfrench.com/revision/grammar/compound-nouns-formed-using-noun-a-verb-infinitive 
For more information on passive infinitives and situations in which ‘ à faire ‘ is needed, see also the link below
 https://www.thoughtco.com/french-passive-infinitive-1368894

Anne Davies · Answer

As in Maarten K.´s second link the sense here is of mild obligation, as in a task you’ve set yourself or something you’ve planned to do / that is to be done. Another Kwiziq question here:

https://progress.lawlessfrench.com/questions/view/use-of-avoir-a-meaning-have-to