How to convert the Dual Language RMVB to 1 Language AVI

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Hi,tvb now,tvbnow,bttvb! v& k: j5 J- i7 O5 `5 T) B

4 l2 H6 J, a' s) R6 X; G% Utvb now,tvbnow,bttvbAnyone know what software can I use to convert the 2 language RMVB to 1 language AVI?/ z1 K$ C$ |2 X4 s3 W

4 A, ?# a. a8 T0 R  sThank you very much