Why is Compressor so slow at exporting HEVC?
I use Compressor to deliver HDR content in HEVC, and I’m confused by exports taking an unreasonable time to finish: for example, a 3-minute-long 4K project took about an hour to export on my top-tier Intel-based iMac.
While Compressor was processing that single job, I was able to export the same project in ProRes 422 (also with Compressor, run in parallel with the HEVC export)—which took no longer than three minutes—and then re-encode it in HEVC using HandBrake—which finished in under two minutes. In HandBrake, I selected the H.265 codec implementation based on Apple’s VideoToolbox framework, and set the same bitrate as in Compressor.
Could someone hint at the reason behind such a huge difference in performance?