[求助]关于graphedit的问题

最近用graphedit分解MKV,视频和音频分离

脚本如下：
LoadPlugin("Vsfilter")
LoadPlugin("D:\Program Files\AviSynth 2.5\plugins\DirectShowSource.dll")
video=Directshowsource("01video.GRF",fps=23.976).textsub("001-2.ssa")
audio=Directshowsource("01audio.GRF")
AudioDub(video,audio)


结果返回错误如下：

Directshowsource:could not open as video or audio.

video returned:"Directshowsource:couldn't open GRF file.01video.GRF:文件格式错误"
audio returned:"Directshowsource:couldn't open GRF file.01video.GRF:文件格式错误"

请问是什么原因啊

graphedit 版本9.04.78.0000-build 041201

LoadPlugin("VSFilter.dll")
DirectShowsource("01video.GRF",video=true,audio=false,fps=23.976)
AudioDub(DirectShowsource("01audio.GRF",video=false,audio=true))
TextSub("001-2.ssa")