for (list<AVPixelFormat>::const_iterator i = pix_fmts.begin(); i != pix_fmts.end(); ++i) {
boost::shared_ptr<Image> foo (new Image (*i, in_size, true));
foo->make_black ();
for (list<AVPixelFormat>::const_iterator i = pix_fmts.begin(); i != pix_fmts.end(); ++i) {
boost::shared_ptr<Image> foo (new Image (*i, in_size, true));
foo->make_black ();