Beta 6 - no longer control Optical Flow per clip

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Jeff Smart

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Beta 6 - no longer control Optical Flow per clip

PostMon Jul 09, 2018 3:39 pm

Hi DR Team,

Just noticed a New Bug crept into DR15b6 (version 15.0.0B.065 for mac macOS:10.13.5):

I recall in DR14 and possible earlier DR15betas we could selectively override the Edit_tab->Inspector->Retime_Process setting "per selected clip" rather than inherit the File->Project Settings->Retime_Process setting.

Now we always inherit the Project settings and ignore the Edit-tab->Retime_Process setting. ie Project_Settings->Retime_Process defaults to Nearest, so select clip and set Edit_tab->Inspector->Retime_process=Optical_Flow and the result process is still Nearest (no Optical Flow frame smoothing).

I also noticed in the same DR15b6_mac while using Optical Flow/Enhanced_Better that it still exhibits repeatable visible artifacts around frame edges, ie a green leaf was zooming out of frame, exited view, than flickered back into the frame edge for one frame, than gone again when it really shouldn't appear in the frame anymore. Standard_Fast does not have this edge particular problem.

Thank you Uli, Sorry not enough details how to create the problem.
I rechecked our projects that showed the problem and found this problem happens when your clip is a Compound clip in the timeline, a source clip works as expected. A typical workflow for us is Stabilise & denoise the original clip than turn it into a Compound clip before we retime it to 50% or so for slower motion, and selectively apply Optical Flow to this Compound clip. Without the Compound clip process the retime+OF appears to happens before the Stab which frequently looks not as good.

Trust this helps.
Last edited by Jeff Smart on Tue Jul 10, 2018 3:47 am, edited 1 time in total.
DR Studio 18.1.4 on 16GB M1 MacMini macOS v3.3.1
34" 5K Ultrawide MSI PS341WU P3 GUI monitor
TB3 -> SW RAID 4 x NVMe @ 5,700MBs
TB3 -> DeckLink Mini Monitor 4K -> 43" Philips HDR1000 wg monitor.
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Uli Plank

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Re: Beta 6 - no longer control Optical Flow per clip

PostMon Jul 09, 2018 4:20 pm

Doesn't happen on the Mac here, I can still set the method individually.
But I can confirm that Enhanced/better is not always better, you have to experiment based on the characteristics of the motion.
My disaster protection: export a .drp file to a physically separated storage regularly.
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Jeff Smart

  • Posts: 27
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  • Location: Malaysia

Re: Beta 6 - no longer control Optical Flow per clip

PostMon Jul 16, 2018 5:04 pm

Thank you Uli,
Sorry not enough details how to create the problem.

I rechecked our projects that showed the problem and found this problem happens when your clip is a Compound clip in the timeline, a source clip works as expected. A typical workflow for us is Stabilise & denoise the original clip than turn it into a Compound clip before we retime it to 50% or so for slower motion, and selectively apply Optical Flow to this Compound clip. Without the Compound clip process the retime+OF appears to happens before the Stab which frequently looks not as good.
DR Studio 18.1.4 on 16GB M1 MacMini macOS v3.3.1
34" 5K Ultrawide MSI PS341WU P3 GUI monitor
TB3 -> SW RAID 4 x NVMe @ 5,700MBs
TB3 -> DeckLink Mini Monitor 4K -> 43" Philips HDR1000 wg monitor.

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