No audio when frame-serving to CCE

[MLT]

I'm using the following avisynth script in order to encode an mpeg2 file in CCE SP:

LoadPlugin("C:\Program Files\AviSynth 2.5\plugins\MPEGdecoder.dll")

mpegsource("C:\DVDA Files\cce test file.mpg")

The result is an mpg file without audio. The cce "Mode" settings are set to MPEG-2, System. Even whne I use Elementary, the demuxed audio file is just silence.

Do I need a special mpeg audio plugin for the avisynth script?

[Boulder]

I wonder if MPEGSource even imports audio from the mpg file. There are dedicated plugins for that, MPASource and NicAudio come to my mind first. You need to load the audio track in the script and then use AudioDub.