- Posts: 7
- Joined: Mon Dec 19, 2016 5:11 pm
- Location: Athens, Greece
I had a strange problem occur today,
I graded a TVC with mixed footage (Alexa 2K Prores444 Anamorphic, Sony A7SII Mp4 at 1080p,720p at various frame rates and DJI 4K footage) on my main workstation which is a Windows Machine.
The client requested Prores4444 and Prores422HQ files as deliverables both rendered flat and as individual clips with 25frame handles. (I know Prores4444 is overkill for the DJI and A7SII footage but this is what they wanted.) This is very common for almost every commercial I grade lately.
All footage exists on a big Storage Server with 10Gb Ethernet and can be accessed from all my workstations.
To do the prores exports I used an iMac. Everything went fine and reasonably fast.
Afterwards I placed the flat Prores files on the top video layer of my timeline on my Windows machine to compare them.
Everything was exactly the same on my external reference monitor and also on internal resolve scopes and external (scopebox); except for the Sony A7SII footage which had lifted blacks.
I immediately thought it was a levels interpretation problem. After some investigation I realised that levels where interpreted differently on Windows than on the Mac but only for the A7SII footage.
On windows Resolve clip attributes for A7SII clips where set to Auto (Which was the same as setting it manually on video) and when opening the same project on Mac Resolve (when set to auto or video) black levels where lifted both on the scopes and on the external monitor.
I then tried setting the levels for those clips at Full on my Windows Resolve and compared that with the Mac Resolve set both at auto and video and they looked exactly the same. I did that in the media pool on the original ungraded clips.
Then I tried setting it to Full on the Mac and resulted on blacks that where even more lifted.
To deliver the project with correct blacks (and highlights) I manually switched the levels to Full on all A7SII clips and re graded them and then on my iMac I changed the attributes back to video.
Then the renders where correct. Problem solved.
I don’t understand though why this is happening.
Seems to be A7SII specific although I haven’t yet tried with other h264-avc encoded footage. I will and post results.
Have anybody had that occur on a similar situation? Does anybody have an explanation on why this is happening?
Both machines are running Resolve 12.5.5.
I graded a TVC with mixed footage (Alexa 2K Prores444 Anamorphic, Sony A7SII Mp4 at 1080p,720p at various frame rates and DJI 4K footage) on my main workstation which is a Windows Machine.
The client requested Prores4444 and Prores422HQ files as deliverables both rendered flat and as individual clips with 25frame handles. (I know Prores4444 is overkill for the DJI and A7SII footage but this is what they wanted.) This is very common for almost every commercial I grade lately.
All footage exists on a big Storage Server with 10Gb Ethernet and can be accessed from all my workstations.
To do the prores exports I used an iMac. Everything went fine and reasonably fast.
Afterwards I placed the flat Prores files on the top video layer of my timeline on my Windows machine to compare them.
Everything was exactly the same on my external reference monitor and also on internal resolve scopes and external (scopebox); except for the Sony A7SII footage which had lifted blacks.
I immediately thought it was a levels interpretation problem. After some investigation I realised that levels where interpreted differently on Windows than on the Mac but only for the A7SII footage.
On windows Resolve clip attributes for A7SII clips where set to Auto (Which was the same as setting it manually on video) and when opening the same project on Mac Resolve (when set to auto or video) black levels where lifted both on the scopes and on the external monitor.
I then tried setting the levels for those clips at Full on my Windows Resolve and compared that with the Mac Resolve set both at auto and video and they looked exactly the same. I did that in the media pool on the original ungraded clips.
Then I tried setting it to Full on the Mac and resulted on blacks that where even more lifted.
To deliver the project with correct blacks (and highlights) I manually switched the levels to Full on all A7SII clips and re graded them and then on my iMac I changed the attributes back to video.
Then the renders where correct. Problem solved.
I don’t understand though why this is happening.
Seems to be A7SII specific although I haven’t yet tried with other h264-avc encoded footage. I will and post results.
Have anybody had that occur on a similar situation? Does anybody have an explanation on why this is happening?
Both machines are running Resolve 12.5.5.
Windows 10 PRO X64 (19044)
Dual Xeon E5-2698v3 @2.30Ghz
128GB ECC Memory
Nvidia RTX 3090 FE
DaVinci Resolve Studio 17.4.2
Decklink Studio 4K 6G
Desktop Video 12.2
Nvidia Studio driver 472.47
Dual Xeon E5-2698v3 @2.30Ghz
128GB ECC Memory
Nvidia RTX 3090 FE
DaVinci Resolve Studio 17.4.2
Decklink Studio 4K 6G
Desktop Video 12.2
Nvidia Studio driver 472.47