thank you PeterT.. it works
You can have a try to use Brorsoft Video Converter for Mac. I have used it for almost one year and it works well for me. I can recognize various common videos, such as MTS, MXF, AVI, MP4,MOV, FLV and so on. Good Luck!
I used to use Faasoft RMVB to AVI Converter for Mac or Windows to convert RMVB to AVI, MP4, MOV, WMV, FLV, etc. Happy with it.
Why not try iDealshare VideoGo which can batch convert RMVB to AVI, WMV, MPG, ASF, SWF, H.265, FLV, MP4, MOV etc on Mac or Windows computer
You can use Avdshare Video Converter to convert RMVB to AVI, to MP4, to MWV, to MKV, to FLV, to MOV, to AVCHD, to MPEG, to MPG, etc.