[NVEnc Encoding] Strange quality slider

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Hanbrakeur
Regular User
Posts: 82
Joined: Mon Jun 30, 2014 10:39 pm

[NVEnc Encoding] Strange quality slider

Post by Hanbrakeur »

Hello everybody,

Unlike the x264/x265 codecs that have an Encoder Preset Slider that goes from UltraFast to Placebo, the "H264 (NVIDIA NVenc)" slider is in this order :
- High Quality
- High Performance
- Fast
- Medium
- Slow
- Default

Does "High Quality" equal "Slowest" and "High Performance" equal "Faster" ? In this case it would be useful for us NVidia users to rename these presets to make them more clear. Thanks :wink:

PS : I know that hardware encoding doesn't give great results, I just use it to quickly transcode a video to a format readable by Sony Vegas without any quality requirement.
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s55
HandBrake Team
Posts: 9900
Joined: Sun Dec 24, 2006 1:05 pm

Re: [NVEnc Encoding] Strange quality slider

Post by s55 »

HQ and HP are very likely identical to Slow and Fast. This is just how Nvidia presents the presets.

They've got a newer preset system that's more akin to x264 that we plan to implement next year sometime that's a little less confusing.

That said, the presets are not identical to x264 since the NVEnc encoder only supports a small subset of the features that x264 does for example. So don't assuming at RF20 @ Medium will be the same as x264. It'll be very different
Hanbrakeur
Regular User
Posts: 82
Joined: Mon Jun 30, 2014 10:39 pm

Re: [NVEnc Encoding] Strange quality slider

Post by Hanbrakeur »

That's clear. Thanks for your quick answer s55 :wink:
dr0
Posts: 5
Joined: Mon Dec 21, 2020 11:52 pm

Re: [NVEnc Encoding] Strange quality slider

Post by dr0 »

s55 wrote: Thu Dec 24, 2020 2:47 pm HQ and HP are very likely identical to Slow and Fast. This is just how Nvidia presents the presets.
Which one is the best quality-wise among these? Does this mean that medium is actually better that slow? Or are they all more or less the same?
Hanbrakeur
Regular User
Posts: 82
Joined: Mon Jun 30, 2014 10:39 pm

Re: [NVEnc Encoding] Strange quality slider

Post by Hanbrakeur »

Hi dr0, if I understand s55 (correct me if I'm wrong), he meant that HQ is identical to Slow and HP identical Fast, so the actual quality Slider is more or less this :
- Fast = High Performance
- Medium
- Slow = High Quality
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s55
HandBrake Team
Posts: 9900
Joined: Sun Dec 24, 2006 1:05 pm

Re: [NVEnc Encoding] Strange quality slider

Post by s55 »

That's basically how it behaves on my system (older 1060)
dr0
Posts: 5
Joined: Mon Dec 21, 2020 11:52 pm

Re: [NVEnc Encoding] Strange quality slider

Post by dr0 »

Okay, thanks for the explanation.
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