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The "rendering" settings for the H.264 encoder has absolutely nothing to do at all whatsoever with the MPE GPU acceleration settings for the project. The hardware acceleration settings for the H.264 encoder does not use CUDA or OpenCL at all; it uses only the QuickSync feature of certain Intel CPUs with their own integrated Intel HD, UHD or Iris Graphics. However, if you have a qualifying Intel i3, i5 or i7 CPU with integrated graphics but then disable the integrated graphics to allow the discrete GPU to function properly, then QuickSync will also be disabled, resulting in the H.264 encoder setting to default to the "Software only" position.
That error box ... note the time listed? That typically indicates there's a problem with the sequence or the cache/media cache database for that sequence at that point. So you go to that spot on the sequence, and see what's "up". You may need to undo/remove the effect (in this case, probably the Lumetri color work) and re-do. You may need to close PrPro and manually delete everything in the cache files, reboot, launch PrPro and give it a few minutes to rebuild cache files, then try to export.
All right all right.
I have always seen the possibility to export with the hardware encoding on my company's station and now that I just built mine I don't have acces to it.
And when I saw the error while exporting I thought it was linked.
There were Intel CPU's and I am on AMD.
Thank you for you help and your time.
I will try that !