Additionally DNxHD doesn't work period under AMD Threadripper.
Cannot import or export DNxHD on an AMD 1950X. Can only export uncompressed video or horrible MP4 quality or whatever that fairly poor GoPro CineForm codec. DNxHD is fairly decent (when it works under Intel CPUs) and only option as ProRes export is disabled/blocked. Apple makes it expensive in attempt to push customers to their 'average' hardware platforms.
I tried a few random things on internet like disabled SMT (16c/16t), disabling cores down to 4c/4t. Didn't make any difference.
I figured out how to install a moderately old but new enough version of FFMPEG 2.6.8 under CentOS 7.3 and command line transcoded the source AVI (captured from mediaexpress) file into DNxHD compressed MOV and a ProRes compressed MOV.
ProRes will import onto timeline. But even browsing to the folder with the DNxHD MOV file inside the "media" view inside Resolve causes it to immediately crash. Had to move to a separate folder as ProRes *WAS* in same folder as DNxHD MOV file.
All three files open fine (once the required gstreamer support library is installed) from totem (gnome's default media player).
All three files playback (import into and export out of Resolve) fine on my Intel laptop, but I can't hear anything because it's a laptop and Decklink cards require PCIe desktop and Resolve only supports Decklink for audio under Linux.
I still wonder why Resolve is linked against pulseaudio on linux:
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[dx@x399 ~]$ cd /opt/resolve/bin/
[dx@x399 bin]$ ldd resolve | grep pulse
libpulse.so.0 => /lib64/libpulse.so.0 (0x00007f97982bc000)
libpulsecommon-10.0.so => /usr/lib64/pulseaudio/libpulsecommon-10.0.so (0x00007f9794556000)
Perhaps the developers PLAN on adding pulseaudio support but is isn't stable at the moment. -- heck if they only added pulseaudio support into the paid version, that would be good.
--Doug (dx9s)