auto asset = dynamic_pointer_cast<dcp::MonoPictureAsset> (dcp.cpls().front()->reels().front()->main_picture()->asset());
BOOST_REQUIRE (asset);
auto frame = asset->start_read()->get_frame(index);
auto asset = dynamic_pointer_cast<dcp::MonoPictureAsset> (dcp.cpls().front()->reels().front()->main_picture()->asset());
BOOST_REQUIRE (asset);
auto frame = asset->start_read()->get_frame(index);