Which processor to encode x265 4K ?

[Asmodian]

Fast/slow/slower?

CRF 21 is not bad with x265. I use lower for x264 but with x265 below that usually results in bitrates near where I would also get transparent encodes using x264. However, I think a CPU benchmark should use slower not fast. Hardware encoding is good enough today that unless you are using slower+ a Turing GPU encode is probably a better option.

[microchip8]

Originally Posted by Asmodian

Fast/slow/slower?

CRF 21 is not bad with x265. I use lower for x264 but with x265 below that usually results in bitrates near where I would also get transparent encodes using x264. However, I think a CPU benchmark should use slower not fast. Hardware encoding is good enough today that unless you are using slower+ a Turing GPU encode is probably a better option.

Custom settings that have features from both slow and slower preset

[blublub]

Originally Posted by Asmodian

Fast/slow/slower?

CRF 21 is not bad with x265. I use lower for x264 but with x265 below that usually results in bitrates near where I would also get transparent encodes using x264. However, I think a CPU benchmark should use slower not fast. Hardware encoding is good enough today that unless you are using slower+ a Turing GPU encode is probably a better option.

I haven't tried GPU encoding for ages. Is it really good looking now?

I will see what I can bench test over the weekend.

From my perspective it doesn't matter what presets are used for a benchmark.
Consistency is important to compare CPUs

[RanmaCanada]

Originally Posted by Atak_Snajpera

Because this benchmark uses samples containing a lot of motion and details!
crowd_run_1080p50.yuv
ducks_take_off_1080p50.yuv
in_to_tree_1080p50.yuv
old_town_cross_1080p50.yuv
park_joy_1080p50.yuv

Looks at this as worse case scenario.

Besides, You are probably encoding at cropped 1920x800 resolution instead of full 1920x1080.

This benchmark shows you what you can expect from CPU A vs CPU B. For example. Should I buy Ryzen 3950x or Intel core i9 10980xe. Do not look at raw numbers because it does not make sense.

PS. 2700x gets 28 fps in my benchmark so be more precise next time ,ok?

I said 2700, not 2700x

[Atak_Snajpera]

Originally Posted by RanmaCanada

I said 2700, not 2700x

According to this graph you should get 24+ FPS then



Indeed huge error from my side ...

[RanmaCanada]

Which I do see with an updated version of x265. Still no where near what I get in real world situations, hence the request for slow and lower presets as that is what the majority of us who encode would be using. Depending on material at slow I see 4-7 fps, and on slower I'm lucky if I get 2, but usually hang around 1.3-1.5 fps. This is for 1080p content. For 4k, on slow I'm lucky if I hit 1fps.

[blublub]

Hi

Ok. Here is one result:

Tears of Steel 4K, x265 preset slow: 6,32fps

Software: RipBot with HEVC encoder version 3.2+34-8e6db24c1517

settings:

x265_x64.exe" --colorprim bt709 --transfer bt709 --colormatrix bt709 --crf 18 --fps 24  --min-keyint 24 --keyint 240 --frames 17616 --sar 1:1 --profile main10 --output-depth 10 --preset slow  --ctu 64 --merange 57

@Atak_Snapjera:
I tried to download your benchmark but the download site kept generating one "key" after another but never presented the download link

[RanmaCanada]

Thank you!

[Atak_Snajpera]

Originally Posted by blublub

Hi

Ok. Here is one result:

Tears of Steel 4K, x265 preset slow: 6,32fps

Software: RipBot with HEVC encoder version 3.2+34-8e6db24c1517

settings:

x265_x64.exe" --colorprim bt709 --transfer bt709 --colormatrix bt709 --crf 18 --fps 24  --min-keyint 24 --keyint 240 --frames 17616 --sar 1:1 --profile main10 --output-depth 10 --preset slow  --ctu 64 --merange 57

@Atak_Snapjera:
I tried to download your benchmark but the download site kept generating one "key" after another but never presented the download link

Important question. Was CPU usage at 100%

[blublub]

No, but close. Since I used the preset slower it was around 80 to 85%. On medium it is around 65

[Atak_Snajpera]

Originally Posted by blublub

No, but close. Since I used the preset slower it was around 80 to 85%. On medium it is around 65

Try again with active Distributed Encoding mode
Use these settings




Flat 100% CPU usage guaranteed!

[blublub]

Hi, I have trouble getting it to encode. I disabled all NICs despite one, disabled FW and Uninstaller AV but the encode still won't start.

[blublub]

OK, I did get distributed encoding to start correctly.

CPU load was mostly between 80 and 90%. That is still an increase of 10 to 15% in cpu load but no matter what I can't get it constantly close to 100%.

I have no clue what the issue here is.
I run the complete encode on a NVME Samsung Pro SSD, so that can't be it.
From what I know from encoding it shouldn't be limited by memory speed and I have quad channel 2933 with more than 50 gb/s, so I guess that's not it either.

May be its a bottleneck within the CPU, i.e AVX capacity.
I don't know, but from what I am seeing here it kinda does not make sense to buy a CPU with more than 24, for encoding at the moment.

[Atak_Snajpera]

Have you tried with 3rd server?

[blublub]

Not yet.
1 encode with the settings has a 60 to 80% usage. Since a 2nd instances only marginally improves the usage I doubt a 3rd encode will, there seems to be some sort of bottleneck.

[Atak_Snajpera]

run my benchmark and see if you get at least similar fps like in my data base.

[blublub]

Can u post an alternate download link?
I already tried to download it 2 days ago but the website did not generate a link.

[Atak_Snajpera]

Maybe you should disable adblock? Change/update browser? Works fine here. Just checked.

[blublub]

K, I'll try tonight

[blublub]

Originally Posted by Atak_Snajpera

run my benchmark and see if you get at least similar fps like in my data base.

Score is 108