How to convert the Dual Language RMVB to 1 Language AVI

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Hi,TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。: C! m. M+ j, t/ u8 H* C
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Anyone know what software can I use to convert the 2 language RMVB to 1 language AVI?公仔箱論壇  W! z5 z, z6 k2 z& E
TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。( C5 x  N0 C1 @" z
Thank you very much