Very bitrate using HEVC nvenc CQP

Joet73

Hi,

I am using Vegas pro 17 with the latest voukoder 4.1 and connector 0.7.0.

I compared the output between Voukoder and nvencc64 right out of Vegas with the same video, resolution 2704x1520 - 30p

Exactely the same parameters: CQP 23, Preset medium, Advanced option exactly the same as well.

Voukoder is giving a video srtream bitrate of 2160kb/s.

Nvencc is giving a video stream bitrate of 70.9Mb/s.

Bitrate from Mediainfo.

Obviously, Voukoder output is of a very low quality, Nvencc one very close to the original.

Why so much difference using the same CQP?

Vouk

CQ=23 is a pretty bad value and I'd expect a bad result with it (I'd recommend a value of 15). That would also explain the low bitrate. 70Mbps is waaaay to high for 2704x1520@30fps with CQ=23.

I strongly assume Voukoder is producing the correct result here.

fifonik

The same CQ value have different meanings for different encoders.

So you should not expect that visual image quality with the same CQ value would be the same for different encoders.

MyPOV

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