AviSynth GPU Acceleration

[jseo13579]

As I've done some research, I found AviSynth has several filters that allow the usage of GPU acceleration for faster processing. My pc is capable of using NVIDIA Corporation (GeForce GTX 970M) and I'm looking for a way to use it when I process my videos on VirtualDub. However, there is no webpage that talks about using that filter. I believe it's LoadPlugin("D:\AviSynth\plugins\DGAVCDecode.dll")
Video = DGAVCDecode_AVCSource(Video, dga=?, i420=?, deblock=?) filter. I'm not really sure if that's the right one and I have no idea what dga, i420, and deblock are about. Does anyone know?

[poisondeathray]

It's DGDecNV. Not free

DGSource("video.dgi")

http://rationalqm.us/dgdecnv/dgdecnv.html

DGDecodeNV has other post processing filters that can run on GPU



Or, newer versions of lsmash can do it too for the source filter itself , and are finally stable for GPU

e.g for AVC in MP4

LSmashVideoSource("video.mp4", decoder="h264_cuvid")

or

for non MP4/MOV containers

LWLibavVideoSource("video.mkv", decoder="h264_cuvid")

Lsmash is only the source filter. No other filters/processing

[jagabo]

Keep in mind that the source filter isn't a bottleneck in most instances. So it usually won't make a big difference in overall processing speed. It can make a difference if you're using very little filtering and a very fast encoder (like NVEnc).

[KarMa]

I personally use my AMD card (RX 460) with LAV Filters for video decoding with Avisynth by first using either Directshowsource or DSS2 as the source filter. Then I use the program Win7DSFilterTweaker_6.3 to set LAV Filters as the default decoder for whatever format my card supports (H.264 HEVC). Win7DSFilterTweaker_6.3 only works with Windows 7, so I'm not sure how to do what it does in Windows 10. This should work the same with a Nvidia Card.

I mostly only use this setup when I want a really fast encode. GPU decoding is also more error prone. Also need to setup LAV Filters ahead of time and make sure it is using your GPU to decode.

[somespirit]

Keep in mind that the source filter isn't a bottleneck in most instances. So it usually won't make a big difference in overall processing speed. It can make a difference if you're using very little filtering and a very fast encoder (like NVEnc).

i have 20-25% increasing in encode speed when i use GPU decoding of source .......if you have source file with big bitrate the speed boost (when encoding) will be more ......