I wonder anyone else here having this problem. I rendered out Magix hecv 4K, play fine on MPC-HC x64 and Windoes 10 media player. But when I import that file into VP15 and Vegas freezed. Whats up with that?
Bruce, media players decode on the fly without decompression. Lots of guesswork goes on that we will never see.
Vegas, a nonlinear editor, must decode everything to raw bits first. Lots of bits means lots of time. And lots of resources. Right tool for the right job.