You may be happy as ffmpeg has added HAP encoder not long time ago. If you have problems it's because you may be using old and crappy QT engine on PC or your app/player is not really well written. Saying this playing 4K is not that difficult today even with ProRes, Cineform etc ( you can do it from eg. Something like Daniel2 should be better/modern replacement (and sort of free now). So maybe it would be a good time to add this support do the BMD/DaVinci ecosystem and maybe get some Adobe users into switching over. And yet they have not shown any sign of actively implementing it. Just recently Adobe deprecated the support of the up to now widely used implementation as quicktime plugin, since it was 32bit based. This is exemplary need to crossfade a background and foreground with alpha at the same time, or crossfade on two independent 4k screens. There is almost no other codec that sports that fluid playback of four 4k+ streams with bitrates beyond 100Mbit and 50/60fps. HAP is one of the (if not THE) industry standard for codecs for GPU decoded playback of high resolution, high bitrate, high framerate video files in the event industry. I saw this suggested once in this post ( viewtopic.php?f=32&t=72269&p=405308&hilit=HAP#p405308), but thought it might be worth its own topic. I would like to suggest to add HAP codec Support (at least on the delivery page, although decoding HAP wouldn't be bad either).
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