Does X264 support 2CPU?

[jeffhuge]

I have a 2CPU xeon(3gX2+1g ram),I choosing the thread to 2 in megui.But it seems no acceleration when encoding but the usage of cpu is around 75% instead of 100% on my 1CPU computer.

any suggestion?
thx
jeff

[foxyshadis]

Yes, it does. But avisynth is primarily singlethreaded and likely bogs performance down; take a look at the MT avisynth thread (http://forum.doom9.org/showthread.php?t=94996) for something that should help immensely.

[ArcticFox]

Does anyone have any performance figures using x264, i couldnt find any worthwhile benchmarks, im picking up an Athlon64 X2 today and wouldnt mind seeing what performance id be getting over my single core Athlon64.

[Sharktooth]

x264 is multithreaded and supports up to 4 CPUs.
using multithreaded avisyth will speed things up too.
both combined could reach a gain of about 70% on true dual core CPUs.

[ArcticFox]

wow, i wasnt expecting that much performance gain.

[Dreassica]

If one would just use avisource to load a lossless file through avs into megui, would avs still bog down multithreads encoding of x364? Or would i still need to use MT in avs?

[Sharktooth]

with SMP/multicore CPUs you should always get better performances with MT avs.

[Dreassica]

So also for simple avs scripts using just avisource?

[Sharktooth]

you better ask in the avisynth forum for detailed answers.

[akupenguin]

x264cli runs avisynth in a separate thread, so multithreaded avisynth is needed only if your script is slower than one of the encoder threads.

[ArcticFox]

Is there anything special i need to do then because im struggling to see any encoding benefits over my single core cpu using this x2 to encode in MeGUI using Avisynth

Because at the minute im test encoding a 1080i to 720p using Nwgats High Profile 6 Ref profile and im getting 2fps.

[Sharktooth]

have you set --thread-input and --threads=auto ?

[ArcticFox]

in the commandline its saying --threads 2 --thread-input

[Sharktooth]

can you post your complete commandline and the whole avisynth script?

[ArcticFox]

Loadplugin("D:\Encoding\hdtv plugins\DGDecode.dll")
Loadplugin("D:\Encoding\hdtv plugins\TIVTC.dll")
mpeg2source("movie.d2v")
TFM()
TDecimate()
crop(2,144,1916,790)
LanczosResize(1280,528)

x264.exe --bitrate 5515 --ref 3 --no-fast-pskip --bframes 3 --b-pyramid --bime --weightb --trellis 1 --analyse all --8x8dct --threads 2 --thread-input --progress --no-psnr --output "" ""