pub fn prepare_load(mpv: &Mpv, subtitle_urls: &[&str]) -> Result<(), String>Expand description
Prepare the next loadfile: these subtitle files will be loaded with it, no
subtitle is shown, and the file’s default audio track plays.
sid/aid set while idle become the options the next file opens with, so
a track chosen for the previous item cannot leak into this one.
TRACES: UR-020, UR-021 | DR-023, DR-024 | UT-275