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Rendering with CPU outputs smaller file than with GPU?

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Andrew Phillips
Rendering with CPU outputs smaller file than with GPU?
on Dec 28, 2015 at 6:12:07 am

Vegas 13 on a Intel Core i7-4790K at 4.0Gz

I have a small test clip I am rendering with "Sony AVC (Internet 1920x1080-30p template)", and the first render with CPU only has a slightly lower bitrate than GPU render and file size is 41,285. If I simply change the same template to GPU render, it comes out slightly higher bitrate and 47,908 and as expected renders faster.

Can someone give me the technical on how this would change the output file quality? I thought it would only change the time it took to render and a bit stoopafied over it. Mostly curious and hoping I always remember to set GPU in my templates.


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Graham Bernard
Re: ndering with CPU outputs smaller file than with GPU?
on Dec 28, 2015 at 8:05:11 am

Wow! That's worthy of a direct posting to SONY. That's truly an awesome revelation.

Thanks for sharing. I'm going to be doing some comparative renders.

* Grazie

Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge


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Graham Bernard
Re: Rendering with CPU outputs smaller file than with GPU?
on Dec 28, 2015 at 9:12:38 am

Some figures from MediaInfo:
GPU 51 secs Render Time
Bit rate mode : Variable
Bit rate : 15.4 Mbps
Maximum bit rate : 16.0 Mbps

CPU 56 secs Render Time
Bit rate mode : Variable
Bit rate : 13.9 Mbps
Maximum bit rate : 16.0 Mbps


And here with BitRate Viewer:

GPU


And now CPU
Firstly there appears to be a difference. Secondly, would I notice a difference? But in any event, there IS a difference and in my part of the World, there shouldn't be.

Interesting, thanks for sharing.

* Grazie

Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge


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