 The choice of formats affects the producer's licensing/royalty costs as well as the title's maximum run time, due to differences in compression efficiency.Discs encoded in MPEG-2 video typically limit content producers to around two hours of high-definition content on a single-layer (25 GB) BD-ROM.The more-advanced video formats (VC-1 and MPEG-4 AVC) typically achieve a video run time twice that of MPEG-2, with comparable quality.