[Nightly] Low Power QuickSync Hardware encoder

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wyup
Posts: 1
Joined: Mon Feb 15, 2021 3:24 pm

[Nightly] Low Power QuickSync Hardware encoder

Post by wyup »

Hello,

What does this additional option do for QuickSync encoder?
Is it a lower power than standard? Less performant? Both are hardware accelerated, aren't they?
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Rodeo
HandBrake Team
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Joined: Tue Mar 03, 2009 8:55 pm

Re: [Nightly] Low Power QuickSync Hardware encoder

Post by Rodeo »

I don't know all the details, but I'm pretty sure it's "low power" as in power == electricity…
musicvid
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Posts: 3981
Joined: Sat Jun 27, 2009 1:19 am

Re: [Nightly] Low Power QuickSync Hardware encoder

Post by musicvid »

I'm pretty sure it's an optimization for the low power Intel CPUs, such as my 65W i5 8250.
It runs about the same benchmarks as an i7 4th Gen, but with less consumption under load.
gmb
Bright Spark User
Posts: 348
Joined: Thu Mar 28, 2013 12:49 pm

Re: [Nightly] Low Power QuickSync Hardware encoder

Post by gmb »

low power means fixed function, so it only uses the fixed function unit for encoding which uses less power. Without FF/lower power it's a hybrid, it can use some GPU resources like execution units, in this mode there is more flexibility/quality but also uses more power.

Up to Gen9 graphics (Skylake-Cometlake) Intel only supports Hybrid for h265 encoding, Gen11 (Icelake) is Intels first fully FF h265 solution but didn't support bframes+bpyramid. Iris Xe (Tigerlake) fixed function added bframes+bpyramid.
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