[Foreigner]

linkRed,
С помощью mediainfo:

Код:

@echo off
setlocal

for %%i in (*.avi) do call:1 "%%i"
goto:eof

:1

for /f %%i in (' "mediainfo --Inform=Audio;%%BitRate%% %1" ') do if %%i gtr 200000 (

    mkvmerge.exe -o "%~n1".mkv %1

)