First of all let me say thank you to everyone that’s replied to my post – as soon as I’d written it a family event happened that took me out of the picture which is why I haven’t responded. But: to be clear all the files are coming in from around the world and all are in their final state so determination of how they capture is not possible. These are not pro cinematographers or DITS or post folk, they’re moving image artists (the kind you’d see on sedition art as with my outputs here https://www.seditionart.com/terry-flaxton ) but they all grasp the various resolutions possible – and they all grasp that compression must occur. Like me though (as I just conflated wrappers and containers – and on that with regards HEVC and MP4, I did some experiments for online streaming some while back and discovered that – staring at an early 4k OLED – HEVC needs pushing in terms of samples to get as good at MP4 such that it’s bit rate and file sizes are equivalent by the time unwanted artefacts have gone). Re Display this will be via a 50 inch 4k OLED LG and the audience will be close up. Now I may not be understanding everything – got that – but I come from the front end, camera. So given my grasp of resolution, is – were I shooting I’d set the camera output to as high as possible in terms of un-compressed files, baring in mind that basic analogue to digital compression happens between lens and light sensitive surface – and the pathway behind that through to data collection in a medium. But the task I have is to gather via the internet a set of 12 x 5 minute pieces of work and from the answers you’ve all given me, I’m thinking I shall create an ask for everyone to send me 4k Pro Res files before I go abroad and just go through standard FCP routes of preparing a loop, then adjusting that at best quality via Compressor. And thanks again for responding.