Listen for the kind of description
Note whether speech describes the scene during gaps in dialogue, or whether the Mac is reading application menus and controls. Those are different audio sources. Apple describes Descriptive Video Service tracks as narrating onscreen action and images between dialogue.
Keep the movie edition and the selected track with the observation. A file can contain several audio versions, and a different edition may offer different choices. Do not infer the available soundtracks solely from another service’s listing of the same title.
Choose from the movie’s actual audio options
Apple places alternate soundtracks under View, Languages and also exposes them through the playback controls’ track menu. Its guide says descriptive tracks are typically marked with DVS in their names. Use the visible list to identify the intended ordinary or descriptive version.
If the movie has no alternate soundtracks, QuickTime does not show a choice for them. A missing selector is therefore relevant evidence. Changing a subtitle language does not necessarily select a different audio recording, even when both languages appear in the same general playback interface.
Verify the intended passage again
After choosing an available soundtrack, replay the same brief passage to compare the narration and dialogue. Keep the speaker route and volume unchanged so the comparison addresses track selection. Confirm that the change produces the accessibility experience the viewer actually wants.
For help, report the macOS version, exact file edition, available track names and whether the unexpected speech belongs to the programme or the interface. If no suitable alternate exists, inspect the media provider’s authorised versions rather than assuming the player can remove narration from an existing recording. These observations distinguish an intentional descriptive track from system speech, caption selection and an unavailable alternate soundtrack.