Identify the temporary choice
mpv documents that many changed settings persist into the next playlist file by default. If an operator adjusted playback for one review sample, decide which values should continue and which should return to their launch baseline.
Reset the intended options
For a targeted launch option, use --reset-on-next-file=fullscreen,speed. If fullscreen or playback speed changes while reviewing one file, this option returns those two settings to their initial values when the next file starts. Those initial values can come from the launch arguments or configuration, as well as built-in defaults. The broader --reset-on-next-file=all attempts to reset as many options as possible; it can also discard useful session choices. Choose the explicit list that matches the review task.
Use two owned samples for a local rehearsal: one that needs the adjustment and one that should use the initial value. Record the value before the transition and after the next file begins. No playlist test was performed for this article; the proposed check must be run on the installed version.
Keep baseline and default distinct
The restored initial value may come from a configuration or launch option rather than the built-in software default. Save that context with the reset policy. This makes the next-file result predictable without suggesting that every session must use factory settings.
Questions answered
Does reset always mean the factory default?
No. The documented initial value can come from configuration or the command line.
Should I always use the all-settings reset?
Choose the smallest scope that matches the review requirement and verify it locally.
Sources & further reading
Official references for the subjects discussed. Service terms and device software can change.