dcpomatic/src/lib/black_content.h, branch 2253-3d-empty

dcpomatic/src/lib/black_content.h, branch 2253-3d-empty DCP-o-matic DCP tools https://git.carlh.net/cgit/dcpomatic/atom?h=2253-3d-empty 2022-05-19T19:35:46Z wip: black pieces; sad part is that Shuffler can't cope with content that doesn't start at the same time. 2022-05-19T19:35:46Z Carl Hetherington cth@carlh.net 2022-05-19T19:35:46Z urn:sha1:8d67ad2e74b6d2c88b52a397a2c2823254ec09fb