VHS to digital via OBS or SLOBS with DEINTERLACING+VP9

Hello! How I can convert VHS (PAL) to MP4(H264) via OBS or SLOBS with deinterlace filter? Avidemux (for example) have exellent deinterlace filters, but I would like to use it in OBS or SLOBS. Do I need any mod or script for deinterlace? And how I can record in OBS or SLOBS using VP9 and OPUS? Why I can do it in Avidemux and can not do in in SLOBS and OBS?