Confirm the title actually offers the track
Open the programme on the sending device and inspect its available subtitle and audio choices. Viaplay says multiple spoken-language options appear in the player and title page when offered, with many such choices on children’s content. The presence of subtitles in one language does not establish a matching dub.
Write down the preferred audio and subtitle combination before beginning. For a family film, for example, the adult may want original speech with translated subtitles while a child needs a dub. Decide which requirement the available title can meet before transferring playback to the shared screen.
Make the selection before the cast session
Viaplay documents starting playback on the phone without casting, selecting the desired language through its audio/subtitle control, and then connecting using Cast. To change it during a cast, disconnect first, adjust the choice and reconnect.
This is a sequencing requirement, so repeating the cast connection without changing the sending app’s selection is unlikely to answer the language question. Note the current point in the programme before disconnecting if you need a reference for resuming. This guide does not promise a particular resume behaviour on every device.
Distinguish track choice from caption appearance
A correctly selected subtitle language may still be too small or visually unsuitable on the receiving screen. Treat appearance as a separate issue from which track was chosen. The Viaplay help provides device-specific style routes, and its AirPlay guidance separately says the phone’s styling is not mirrored to Apple TV.
When reporting a problem, state that Chromecast was used, list the track visible before connecting and describe what reached the television. That evidence is more useful than saying all subtitles fail. It separates a missing title language, the required cast sequence and a receiving-screen presentation problem without assuming they have the same fix.
Questions about this guide
How do I change Viaplay language while casting?
The official guide says disconnect, select the desired track in the app, then reconnect.
Does a translated subtitle mean the title also has that dubbed audio?
No. Inspect the separate audio and subtitle choices actually offered for that title.