Performance difference in CCE between VFAPI and AVISynth to frameserve for CCE

[pingles]

I was wondering if anybody had any first-hand experience in a change?

I'm currently using VFAPI w/ CCE 2.50, on an Athlon XP 2000+ Processor, 512MB RAM on Windows XP. Currently, its processing (without any filters) at 1.077x real-time. The input to VFAPI is a DVD2AVI 1.77.3 d2v project file.

I've heard that using AviSynth improves the performance, but when I tested it earlier (after finally getting it working) it seemed to keep performance somewhere around the 1.1x mark (not a huge gain!).

Does HDD speed limit performance? It's too late to change it now, but I'll try setting the output for CCE to a different drive to see if that improves things.

[bb]

What's your source? If it's uncompressed or Huffyuv compressed AVI, then HDD speed can be a limiting factor because of the huge amounts of data to be transferred.

AviSynth is faster because you can frameserve without color space conversion (VFAPI converts to RGB). With AviSynth 2.0x you can stay in YUV2 color space, with the new AviSynth 2.5 (still work in progress), you can even stay in YV12 (which is great for DVD sources).

bb