1dbc5675c1
An identical call exists in ffmpeg.c With POSIX/glibc, stderr is already unbuffered (or line-buffered when a terminal is connected), but not in case of MSVCRT. Explicitly calling setvbuf() like in this commit, makes the Windows runtime behave like POSIX, giving the same “print immediately” behavior. Signed-off-by: softworkz <softworkz@hotmail.com>