.m4s & .mpd video conversion ?

Hi,

I don't know much about these formats but I have some of those from steam replays and I couldn't export those using Steam directly so I had to find another method, I'm currently struggling to export those and couldn't convert to .mp4 using FFmpeg even though I can read my video from .mpd file in VLC. I was wondering if we could possibly have this conversion be done in VERT ?

Thanks