GPU Accellaration (CUDA) not working with H264 1080P Exports

[Abdul_Majid]

When I export to H264 1080p, my GPU monitor is showing no signs of activity and it is taking approximately 10 hours for my 90 minute timeline to render through.

When I export the same timeline to H264 720P, my GPU monitor shows significant activity and my 90 minute timeline renders in less than an hour.

I have the GTX 1070 graphics card. I don't think it is the graphics card at fault because I used to get the same problem when I used to use the supported GTX 570 card.

I have tried this in Premier Pro CC (2017). I have also tried exporting through Media Encoder but I get the same performance problem.

Any ideas or suggestions welcomed.

[Abdul_Majid]

note:

when I export to h264 1080P

     Graphics Monitor: Little or No Activity - getting the odd fluctuation from 0 to 1%

     CPU Monitor: 90-100%

     Time taken to export: approx 10 hours

When I export to h264 720P

     Graphics Monitor: 30-40% Activity

     CPU Monitor: <80%

     Time taken to export: approx 50 minutes

[R Neil Haugen · Accepted solution]

The GPU isn't necessarily used much in a "straight" export, such as if that's a 1080 sequence to a 1080 export. However, the GPU is used for resizing on export. This could be the reason you're getting this behavior.

Yea, odd, but ... sigh.

Neil

[Abdul_Majid]

That's a very good answer - spot on!!!

Does that mean GPU only good for resizing projects? That has to be a bug, surely(?).

I tested by changing my Sequence frame size from 1080P to 720P and then attempted to export to 1080P from the 720P sequence - now I can see plenty of GPU activity. By doing this, am I getting any real benefit in terms of the time taken to export?

[Abdul_Majid]

note: I can get increased GPU activity by simply changing my sequence "Frames Per Second" from 25fps to 50fps and then exporting to 25fps. So, it looks like the project sequence setting has to be different to the export settings - only then you are likely to see GPU activity during export. Is this a valid assumption? Surely this has to be a bug(?).

[R Neil Haugen]

The GPU is not used for simple re-encoding work ... that's a CPU job. Note, they don't do the same kinds of math processing. There are a list of things that are GPU-accelerated, and they do keep expanding it. Primarily, it's involved with things that either change frame-size/rate and color/tonal changes. So Warp Stabilizer, Lumetri, a number of other effects are built around a GPU if available.

But "simple" encoding isn't. And this isn't a bug ... it's the way the various processes work. They are trying to get more things ported out to use the GPU when possible as we go along.

Neil

[kevinjjjack]

I'm getting 600 hours to export a 2 hour 1080 video. The original file is 4k 10 bit ...

[Averdahl]

Enough space on the disk?

Any disk with less that 10% free space is more or less unusable and will cause issues like this.

Solved: Re: 5 Days to export a 4k 9 hour video, is this no... - Page 2 - Adobe Support Community - 1...

[Andy 1968]

GPU acceleration and GPU encoding and decoding are not the same thing. I think the GTX 1070 can use GPU encoding and decoding which can help render times for H.264. If you have a supported Intel based CPU you can comapre the GPU to the CPU for encoding and decoding. If you watch the video below I can make the GPU work hard or the CPU work hard. My renders time can very depending how I have things setup.