Blackmagic Forum

on v11 I was getting 44 - 48 fps 4K DCI 50p ProRes 4444 on a iMac 4GHz 32gig Ram.
same machine, with v12 only 30 - 34 fps no correction.
well, you cannot have everything

I think trying to play back 4K on an iMac winds up as excessive expectations. I bet it might work if you played it at half-res or quarter-res.

To me, iMacs are not ideal for heavy-duty editing or color. They can work for VFX and sound, provided you have lots of very fast external storage and tons of RAM.

untildawn wrote:on v11 I was getting 44 - 48 fps 4K DCI 50p ProRes 4444 on a iMac 4GHz 32gig Ram.
same machine, with v12 only 30 - 34 fps no correction...

That is strange that 12 is appearing to be slower than 11. Just speculating, since everyone is seeing performance improvements with the Resolve 12 public beta, that something else may have changed... Something else using the machine at the same time, the memory or media storage getting full or busy at the time?

The new Configuration Guide does indicate that 4K will run on that iMac with 4GB of GPU VRAM. But I don't understand how how we're seeing 44-48 fps on 4K DCI in Resolve 11. Are you sure you were not using proxies on the Resolve 11 test? Don't mean to sound stupid, but when the results are surprising, I just suspect some other factor has come into play.


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Marc Wielage wrote:I think trying to play back 4K on an iMac winds up as excessive expectations. I bet it might work if you played it at half-res or quarter-res.

4K 50P fluid playback isn´t even possible on desktop level. V11 after caching was at least playing up to 48fps.

rick.lang wrote:

untildawn wrote:on v11 I was getting 44 - 48 fps 4K DCI 50p ProRes 4444 on a iMac 4GHz 32gig Ram.
same machine, with v12 only 30 - 34 fps no correction...

That is strange that 12 is appearing to be slower than 11. Just speculating, since everyone is seeing performance improvements with the Resolve 12 public beta, that something else may have changed... Something else using the machine at the same time, the memory or media storage getting full or busy at the time?

It is a huge performance improvement comparing to 11 no doubt here. I just wanted to point out that 4K lost some fps performance.
BTW all posts reporting about performance boost are speaking about 1080p Timeline.

rick.lang wrote:The new Configuration Guide does indicate that 4K will run on that iMac with 4GB of GPU VRAM. But I don't understand how how we're seeing 44-48 fps on 4K DCI in Resolve 11. Are you sure you were not using proxies on the Resolve 11 test?

Even with proxies, if 11 plays them back with up to 48fps and 12 with only 34fps there is a difference.

rick.lang wrote:Don't mean to sound stupid, but when the results are surprising, I just suspect some other factor has come into play.

I turned iMac on, opened my 4K 50p project on Davinci 11, played it back and I got 44 -48 fps of cashed ProRes 4444. I quit DaVinci, installed V12, reopened the same project, I got 30 - 34 fps. I thought, hm? perhaps a reboot would be not bad . I did that and again same result. All this result are from color room with no correction applied to them.
On editing room I get the same framerate of 30 to 34 fps, but when choose "Show all video frames" I only get a playback of 25-26 fps.