cpu working at 40% when encoding x265 on Megui

[zanzar]

ain't it suppose to work on 90~100 % for faster encoding?

[sneaker]

What CPU do you have?
What are your x265 settings?
What is your AviSynth script?
What is your source file? (MediaInfo)
How many fps?

There are multiple potential bottlenecks.

[jagabo]

filtering?

[zanzar]

What CPU do you have?
What are your x265 settings?
What is your AviSynth script?
What is your source file? (MediaInfo)
How many fps?

There are multiple potential bottlenecks.

settings : program --crf 14.9 --output "output" "input" (nothing special)

script

Mpeg2Source("D:\VIDEO_TS.d2v", CPU2="ooooxx")
TFM().TDecimate(Mode=1)
ColorMatrix(mode="rec.601->rec.709")
ColorYUV(cont_y=-5, cont_u=0, cont_v=0,gamma_y=-20)
Santiag(2,2)
McTemporalDenoise(settings="medium")
Hysteria(strength=5.0, maxchg=25, lowthresh=26, highthresh=20)
nnedi3_rpow2(2, cshift="spline16resize", fwidth=960, fheight=720)
Hysteria(strength=8.0, maxchg=32, lowthresh=9)
Dehalo_alpha(rx=3, ry=3, darkstr=0.3, brightstr=0.3)
Blur(0.5)

source : dvd NTSC files

i get 3.1 fps

[jagabo]

McTemporalDenoise() is the bottleneck if you are using single threaded AviSynth.

[zanzar]

McTemporalDenoise() is the bottleneck if you are using single threaded AviSynth.

can you explain what do you mean by "single thread"?

its just the "default" version from their site

[jagabo]

You need a multithreaded build of AviSynth if you want multithreading.

http://forum.doom9.org/showthread.php?t=148782

You'll also need to add MT commands to your script.

SetMtMode(5,4) # mode 5 for Mpeg2Source, 4 threads -- more or less depending on CPU and script
Mpeg2Source(...)
SetMtMode(2) # mode 2 for the rest of the script
RestOfScript()

But not all filters work with multithreaded AviSynth. I'm not sure if MeGUI supports it either.

[hello_hello]

Or instead of multithreaded Avisynth you can run two encodes at a time.

For single encoding jobs with x264 I'd make a copy of the script and add Trim() to the end of each so each script encodes half the video, then run them simultaneously. To ensure you can join the output files with MKVMergeGUI, it requires --stitchable in the x264 command line. I don't know if x265 has or requires such an option to append video. Anyone know?

[hello_hello]

But not all filters work with multithreaded AviSynth. I'm not sure if MeGUI supports it either.

It does as long as you tell MeGUI to use the "installed" Avisynth rather than it's portable version. Of course the installed Avisynth has to be a multithreaded version and MeGUI won't add the multithreading stuff to a script for you, but you can add it yourself or create an AviSynth script template that includes the required MT stuff.

[vhelp]

I don't know if x265 has or requires such an option to append video. Anyone know?

It was a while back when I tried it, and it did work back then: for x265, you have to encode the video as "raw" and don't specify mkv as a container. encode those clips as raw and then append them together as one, then rewrap in mkv later. You can use dos copy command or ffmpeg, etc., to append two or more files, same specs, into one file.

To encode a raw is simple. just specify .h265 to the filename for the encode. ie, "video1.h265" "video2.h265" and append via dos, copy video1.h265 + video2.h265 video.h265, and then use whatever you prefer to rewrap them, ie, ffmpeg -i video.h265 -vcodec copy -o video.mkv