der Film
film / movie
A work of cinematic art; a sequence of moving images that tells a story or conveys information.
Wir haben uns gestern Abend einen spannenden Film im Kino angesehen.
We watched an exciting film at the cinema last night.

film
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film / movie
A work of cinematic art; a sequence of moving images that tells a story or conveys information.
Wir haben uns gestern Abend einen spannenden Film im Kino angesehen.
We watched an exciting film at the cinema last night.

You can easily recognize the meaning of 'Film' (film) from context. Words like 'Kino' (cinema), 'Schauspieler' (actor), or 'ansehen' (to watch) point to a cinematic work. Terms like 'dünn' (thin), 'Schicht' (layer), or 'Oberfläche' (surface) indicate a coating. 'Kamera' (camera) or 'entwickeln' (to develop) refer to photographic material.
Welcher Schauspieler spielt die Hauptrolle in diesem Film?
Which actor plays the lead role in this film?
For the meaning 'Kinowerk' (cinematic work), there are fixed verb combinations. You can 'einen Film ansehen' or 'einen Film schauen' (watch a film), 'einen Film drehen' (make/produce a film), or say 'ein Film läuft' (a film is playing) in the cinema.
Der Regisseur hat drei Jahre an diesem Film gearbeitet.
The director worked on this film for three years.
When 'Film' means a thin layer, it is often combined with a noun that describes the material. Common examples are 'ein Ölfilm' (an oil film), 'ein Staubfilm' (a film of dust), or 'ein Schmutzfilm' (a film of dirt).
Auf der Suppe hatte sich ein dünner Fettfilm gebildet.
A thin film of fat had formed on the soup.
video
'der Film' and 'das Video' both have to do with moving images. 'Film' often means a longer work that tells a story or is made for the cinema and television. 'Video' usually means a digital recording, often shorter and intended for a phone, the internet, or a screen. The words can be confused because you can watch both. But it is more natural to call a feature film or cinema film 'Film', and a recording from a phone or on the internet 'Video'.

Der Film beginnt um acht Uhr und dauert fast zwei Stunden.
The film starts at eight o'clock and lasts almost two hours.
Im Chat schickt ihr ein kurzes Video vom gemeinsamen Kochen.
In the chat, she sends a short video of them cooking together.