HDRX Very slow renders

[Robino_J]

Playing back / Rendering is very slow with HDRX footage. This is with Dragon 6K footage using iMac Pro.

When disabling HDRX (using just A Frame, no blending) playback at full debayer is around 15fps, when using blending it drops below 0 fps.

When rendering it freezes, then it processes a bunch of frames in a burst and freezes again, then another burst etc. Same R3D without HDRX renders in 8min, with HDRX takes 2 hours +

Is this normal?

 

[Peter Chamberlain]

Which Resolve version?

 

[Robino_J]

Which Resolve version?

DaVinci Resolve 15 Studio Public Beta 5

It was also happening using previous Resolve 15 Betas. Unsure about Resolve 14.

 

[Robino_J]

I made a screen capture video showing you the issue.

Password: resolve

The 5.13sec test clip in the video with HDRX OFF takes 17sec to render and with HDRX ON it takes 1.57min.

Here’s a breakdown of the video so you don’t have to watch the full 4min video..

00:00-00:08 - Scrubbing through timeline at quarter resolution with HDRX OFF (perfect)
00:08-00:20 - Showing Camera Raw / RED Settings
00:28-00:35 - HDRX OFF playback in realtime (at Quarter Res)
00:40-01:17 - Rendering test clip with HDRX OFF (17sec for rendering)
01:21-01:23 - Switching HDRX ON
01:28-01:39 - Scrubbing through timeline at quarter resolution and Playback with HDRX ON (Playback at around 15Fps which makes sense)
01:44-03:57 - Rendering test clip with HDRX ON (1.57min for rendering)
03:03-03:27 - Showing Resolve Preferences (Did that while rendering.. note that it doesn’t affect render time to go in Preferences)

You will notice the "hangs" and short burst of frames I mentioned in my initial post during render with HDRX ON.

Thanks for looking into this

 

[Robino_J]

Installed Resolve 14.1 to check if that was happening in prior versions and it is but the freeze between bursts are shorter.

Anyone ever rendered HDRX footage in Resolve? How does it go for you, same results or is it an issue on my end?

 

[Michael Tiemann]

Installed Resolve 14.1 to check if that was happening in prior versions and it is but the freeze between bursts are shorter.

Anyone ever rendered HDRX footage in Resolve? How does it go for you, same results or is it an issue on my end?

I've never had that problem. I've only ever seen a 2x slowdown in frame rate while rendering (using my RR-X for decoding). I've used Resolve since version 8 (now on 15b5). But I haven't tried any HDRx footage lately--this is just from memory.

 

[Robino_J]

If anyone wants to help test this - I made a small 2 sec clip that you can download by clicking the link below the picture.



https://wetransfer.com/downloads/9dd5277739879f3b28595f98ea2d3e4720180806172820/720b9b418885efa72fb6ed8391f2d18020180806172820/d87fa0

My results are:

*All renders are FULL DEBAYER / PRORES 422HQ / 1080P

- REDCINEX (HDRX OFF, A FRAME ONLY) = 5.6sec
- REDCINEX (HDRX ON, SIMPLE BLEND) = 10.3sec
- RESOLVE 15 BETA 8 (HDRX OFF, A FRAME ONLY) = 4sec
- RESOLVE 15 BETA 8 (HDRX ON, SIMPLE BLEND) = 33sec

My hardware specs are:

iMac Pro 10 Cores
64GB Ram
Pegasus R8