With the format factory conversion, choose the CD-ROM device-DVD to video file, choose avi or rmvb as the format, and you can choose dubbing (audio stream) and subtitle language. You can choose Mandarin in the audio stream. If you are not sure which track is Mandarin, you can choose one first, switch to a test, and then choose another number if it is incorrect.

See the attached figure, click the thumbnail to enlarge.