[HELP] Video have different time and audio desync after conversion

[Lemenus]

I'm trying to compress stream capture into smaller size file but have some troubles with it. After conversion from TS AVC to MP4 AV1 video time becomes shorter and at some point it's audio begin to desync. I assume it's because it's in a vaiable frame rate mode, while Hybrid mistakenly assumes that it's in 30 CFR, and i dunno how to change it or enforce vsync (i heard that it helps in such cases)