for %%a in ("*.webm") do ffmpeg.exe -i "%%a" -vcodec h264 -acodec aac -strict -2 "converted\%%~na.mp4"
for %%a in ("*.mkv") do ffmpeg.exe -i "%%a" -vcodec h264 -acodec aac -strict -2 "converted\%%~na.mp4"
for %%a in ("*.mov") do ffmpeg.exe -i "%%a" -vcodec h264 -acodec aac -strict -2 "converted\%%~na.mp4"
for %%a in ("*.avi") do ffmpeg.exe -i "%%a" -vcodec h264 -acodec aac -strict -2 "converted\%%~na.mp4"