NEW in v1.73, up to v1.73.6 (March 2026): Some YouTube app HLS videos now offer alternative language tracks (generated by AI dubbing). Language choices will be made in order of preferences set with option -lang (or by environment variable $LANGUAGE, which "-lang" overrides). Format is -lang fr:es:en, where French ("fr") is the first choice, if available, then Spanish ("es"), etc. $LANGUAGE has the
