this post was submitted on 26 Feb 2025
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AV1

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submitted 3 weeks ago* (last edited 3 weeks ago) by [email protected] to c/[email protected]
 

My CPU is an AMD 5600X. My test video is 1080p 30fps, I'm trying to bring it down to 480p using AV1.

This is my first time playing with AV1. I bought an A310 to play around with because I read that the hardware encoder was faster than software, albeit lower quality and slightly larger.

Quality isn't important to me, I have 700gb of 480i video that was saved at 1080p and inefficiently encoded, I want to reduce its size dramatically.

I'm using handbrake on Windows, and I chose AV1 SVT at first, and I average about 150fps, sometimes 120 sometimes 180. My CPU sits at 100%.

But if I choose AV1 Intel QSV, I average only about 40fps. And the GPU sits at 68%.

What am I missing? Thanks in advance

Edit: I found a thread from a year ago saying that encoding performance dropped after driver 4887, so I rolled way way back to 4885 from October 2023, and my performance almost doubled to 70-80 fps. But this is still far worse than SVT on CPU alone.

I read about a bug where the whole card can only be utilized if running two jobs simultaneously, so I tried this. The second job runs much slower, about 10-20fps. But that does bring me closer to 90-100fps combined, sometimes 🤷‍♂️

Something has got to be wrong, or maybe I'm expecting too much performance for the job I'm doing? I don't have any special filters set up. You'd think encoding 1080 to 480 would be lightning fast.

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[–] [email protected] 2 points 3 weeks ago (1 children)

Ignore the yammering about QSV being the wrong encoder, it isn’t. Try setting “lowpower=0” in the ”More Settings” box, although I do not know if that works on windows or just linux.

If you have the means to, I would encourage you to test on linux, as others have suggested, as it could help you determine if it is a software problem or if those are the right numbers for that gpu.

[–] [email protected] 2 points 1 week ago

Thanks for the suggestions! Low power=0 didn't work for me. But booting up a Linux Mint live environment did the trick! Average 280fps! This is much closer to what I expected. Thanks!

Though the CPU use is still 70% across all cores, which seems high? It's definitely using the card though, because if I switch to SVT they get absolutely pegged, and the fps is around 130 (for this specific test file).

Normal?