ffmpeg

@echo off

set "ffmpeg_bin=[location]"
set "out_path=[location]"
cd /D "[location]"

for %%f in (*.mkv) do (
echo %%~f
%ffmpeg_bin% -n -ss 00:11:00 -i "%%~f" -frames 1 "%out_path%\%%~nf-thumb.jpg"
)