s->subtitle->set_colour (dcp::Colour (255, 255, 0));
s->subtitle->set_shadow (true);
s->subtitle->set_effect_colour (dcp::Colour (0, 255, 255));
s->subtitle->set_colour (dcp::Colour (255, 255, 0));
s->subtitle->set_shadow (true);
s->subtitle->set_effect_colour (dcp::Colour (0, 255, 255));