Rough Playback

DaVinci Resolve

Rough Playback

Posted by Perry Trest on July 30, 2011 at 11:45 pm

While awaiting the arrival of the full version of Resolve, I am testing with Resolve Lite.
Using a ProRes422HQ 1920×1080 23.98fps as source, Resolve is playing back in fits.
With no grade applied, the sound and picture start and stop abruptly during playback.
Am I missing a playback setting?
How do I determine if the Quadro 4000 is being utilized by Resolve?
Thanks in advance for any trouble shooting tips.

Perry Trest
POSTDIGITAL, Inc.

MacPro 8-core 2.8Ghz
8GB RAM
Slot 1 = GT120
Slot 2 = Quadro 4000
Slot 3 = DeckLink SDI
Slot 4 = Nitris DX
Internal 6TB 4-Drive software RAID-0

Perry Trest replied 14 years, 9 months ago 4 Members · 5 Replies
5 Replies

Rohit Gupta
July 31, 2011 at 2:25 am

Hi,

If you are using OSX 10.6.8, please remember to install the Q4000 driver for OSX, and also install CUDA 4.0.19/4.0.21.

For the 2008 Mac Pro, you can set the video monitoring to 8-bit to get better playback.

Regards,
Rohit
Jake Blackstone
July 31, 2011 at 3:04 am

You may also see, if you can playback you prores QT file by itself. You may have a drive that is too slow or it may be to fragmented.
Perry Trest
July 31, 2011 at 3:17 pm

Ah yes, I remember reading about the 2008 MacPro requiring 8-bit playback settings. I’ll give that a shot on Monday.

Even though playback was choppy I did a rough grade and rendered out a uncompressed 10-bit QuickTime. Both the ProRes and uncompressed QTs play back beautifully in QuickTime Player. I’m using an internal 4-drive software RAID-0 so I doubt that drive speed is an issue. The BlackMagic Speed Test redlines at around 430mb/s read/write on this RAID.

Can you cats tell me how to verify that Resolve is indeed utilizing the Quadro 4000? It appears in the system profile, so I know the MacPro sees it.

Perry Trest
POSTDIGITAL, Inc.

MacPro 8-core 2.8Ghz
8GB RAM
Slot 1 = GT120
Slot 2 = Quadro 4000
Slot 3 = DeckLink SDI
Slot 4 = Nitris DX
Internal 6TB 4-Drive software RAID-0
Spencer Tweed
August 1, 2011 at 2:21 am

As Rohit said, did you install the drivers?
Perry Trest
August 1, 2011 at 3:26 pm

I installed the latest drivers and switched the playback settings to 8bit and everything appears to be working well. Thank you guys for your help!

Perry Trest
POSTDIGITAL, Inc.

MacPro 8-core 2.8Ghz
8GB RAM
Slot 1 = GT120
Slot 2 = Quadro 4000
Slot 3 = DeckLink SDI
Slot 4 = Nitris DX
Internal 6TB 4-Drive software RAID-0

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