/** true to create an A/B comparison DCP, where the left half of the image
is the video without any filters or post-processing, and the right half
has the specified filters and post-processing.
*/
bool _dcp_ab;
/** true to create an A/B comparison DCP, where the left half of the image
is the video without any filters or post-processing, and the right half
has the specified filters and post-processing.
*/
bool _dcp_ab;