The middle one ("applying different compressions to the same video and comparing the results"). I write streaming video servers. An aspect of the job is contin

The middle one ("applying different compressions to the same video and comparing the results"). I write streaming video servers. An aspect of the job is continuously optimizing parameters and codecs to satisfy PSNR and perceptual video quality test cases across a large library of test files. It's not a fun aspect of the job.