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stephane257202055car
Participant
August 19, 2022
Question

DNxHR encoding quite slow

  • August 19, 2022
  • 1 reply
  • 413 views

Hi,

 

I converted a DNxHR 444 12 bits to a DNxHR HQX. Same resolution, same fps. It tooks 7 minutes with a 3080Ti (cuda enabled).

 

Then I tried to encode from the same file to the same location with DaVinci Resolve Studio and it tooks less than 2 minutes.

 

It seems DNxHR is the only codec where DaVinci Studio is really faster than Premiere Pro / Media Encoder. Is there a reason ? Am I missing something ?

 

Thank you

This topic has been closed for replies.

1 reply

S
stephane257202055carAuthor
Participant
August 24, 2022

FYI, the answer from blackmagic : DNxHR is hardware accelerated with DaVinci Resolve Studio. 

ChWard
Community Manager
ChWardCommunity Manager
Community Manager
August 24, 2022

Hi, thanks a lot for reporting this back to us. Whilst I take a look into the issue. Which AME version have you experienced the poor performance with and was it better in older versions? Also do you experience faster encoding times directly out of Premiere?

Best,

Christopher

S
stephane257202055carAuthor
Participant
August 24, 2022

Hi WardC,

 

I'm not saying Adobe Media Encoder has a "poor performance". For example, the h264/h265 encoding is terrific.  IMHO, it outperforms DaVinci. And the GPU is very usefull.

 

But the DNxHR export do not use my 3080Ti (not more than 10/11%). First, I was on Premiere Pro and the export was quite slow. When I tried the same settings on DaVinci, I was astonished by the speed (the GPU was about 50% loaded). That's why I gave it a try with Media Encoder... first 2021 (at home), then 2022 (at the postprod facility).

 

Blackmagic explains DNxHR is accelerated by the GPU. It sounds right to me. So, the question is, does Premiere Pro/Media Encoder use the GPU to encode/decode DNxHR files ? It seems not, which can explain these performance. 

 

Regards,

Stephane

 

ps : I'm wondering if ProRes is affected too...

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