This is probably more of a Resolve question but I'm aaf ing from Avid so perhaps someone on the L2 has battled this.
I have a macpro mid 2012 cheese grater 12core 2.66GHz, Mac OS 10.12.6 MC 2018.12.1, Resolve 15.4 Studio. I have a GTX-680 in the tower and I have a cyclone microsystems expansion chassis with 2 TitanX GPUs, not flashed for mac but the 680 handles the GUI.
I'm working with Panasonic AVC-Intra 4096_2160 YUV 10bit Rec 709 media attached to USB 3 from a Graid and or a OWC Dual Elite.
I set the timeline setting in Resolve to 4096_2160. I have an Avid branded DNxIO running the latest Avid Desktop software for it. My ultimate goal is to mimic how I use the DNxIO in Avid where I feed an LG OLED 55 inch with HDMI and then take advantage of setting the DNxIO to Single or Dual Linik so spigots 3 and 4 provide an HD downconvert. Then the LG can help in pixel busting and I can use my HD Tek scope and Sony PVM-A250 for color.
In my limited understanding, and please correct me if I'm wrong, I want to set the Resolve timeline setting to 4096_2160 to maintain all the pixel goodness of my original media. Then because I want to feed UHD to my LG monitor I set the video monitoring to 3840_2160 and set the image scaling to HD. This works but I don't have my LG at home to test the HDMI output. The problem is playback performance in the Resolve color tab won't playback at 203.976. This is with no color correction done at all just a source side LUT var35 to Rec 709. If I switch to the edit tab I can get 23.976 playback.
If I instead leave the timeline at 4096_2160 and set video monitoring to HD I then get a postage stamp out of the spigots 3 and 4. I can resolve the postage stamp by setting image scaling to match timeline. In this configuration I get full playback speed. But in this configuration given I have set the video monitoring to HD I assume the HDMI out of the DNxIO will now be HD and not UHD.
Can anyone shed some light on the heirarchy of timeline settings, video monitoring and image scaling? I think perhaps the nature of the DNxIO internal downconvert to spigots 3 and 4 when in dual or single link mode may contribute to the postage stamp behavior. I have found no parameters in the Video Desktop software to address this internal downconvert. I only learned about it by a response to one of my old threads on how to use it with Avid Symphony.
I'm a little surprised at the lower performance in the UHD monitor mode given I have two TitanX GPUs and a GTX-680. I experiemented with forcing the GPUs to Cuda, Open CL and manually assigning them. It seemed just leaving the setting to Auto provide as a performance as any other permutation. I would think with all that GPU setting video monitoring to UHD shouldn't keep it from playing at 23.976. If the performance issue was based on my source drive throughput I would think that would happen no matter what settings I choose, but given it only happens with UHD monitoring I have to feel like it's a processing issue. I realize as I add color grade nodes and noise reduction performance will probably suffer until things cache or whatever happens.\
Any suggestions welcome. I'm in Resolve classes again for the next two weeks but we don't always get into the nitty gritty hardware stuff.
John Moore Barking Trout Productions Studio City, CA bigfish@pacbell.net
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Posted by: John Moore <bigfish@pacbell.net>
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