Helmut Tessarek <tessarek <at> evermeet.cx> writes: > ERROR: libx265 version must be >= 17. > > Kind of strange, since the latest (today's) libx265 has the version: > > #define X265_BUILD 15 It's 23 here. #define X265_BUILD 23 Please consider reading https://ffmpeg.org/contact.html again. Carl Eugen