KillAudio
From Avisynth wiki
AviSynth+
Up-to-date documentation: https://avisynthplus.readthedocs.io
KillAudio(clip)
KillVideo(clip)
Removes the audio or video from a clip completely. Can be used, if the destination does not accept an audio or video source, or if AviSynth crashes when processing audio or video from a clip.
KillAudio() can be called at any time to remove audio, and may be chained:
DeleteFrame(KillAudio(DirectShowSource(clip)), 100)
