set_tty_echo     3898 fftools/ffmpeg.c         set_tty_echo(1);
set_tty_echo     3903 fftools/ffmpeg.c         set_tty_echo(0);
set_tty_echo     3947 fftools/ffmpeg.c             set_tty_echo(1);
set_tty_echo     3952 fftools/ffmpeg.c             set_tty_echo(0);