From the official website http://www.doremisoft.net/DVD-to-MKV-Converter-Mac/ you can download Doremisoft DVD to MKV Converter for Mac.

 

Click DVD Load to find and open the DVD folder from your hard disc or DVD-ROM, select the VIDEO-TS folder and then click Open button.
In the pop-up window of DVD Loader, displaying all the loaded files, you can use the left click or right click menu options to choose the video files you wish to convert,then click OK.
Tips: You can change the subtitle and audio track for the selected files,but it depends on your source files.

 

 

Click the Triangle Icon for Profile item to open the drop-down list and set the output format for files, and click ... symbol to set an output directory to save the converted files.
Choose if merge the selected files into one file or not by clicking Merge button.
If you don't need any specific effects,just click the Start button to convert the videos.
After conversion finished,click Open to view the converted files in Destination item.

 

 

Select a video file you wish to trim, then click Clip. In the Clip dialog box,watch the video by clicking Play in Preview Monitor, and click and these two buttons to trim a video clip. Alternatively, you can drag the triangle cursor on timeline to set the start time and end time.

 

 

Would you want to crop away the unwanted contents, such as subtitles or black bars?
Click Edit, in the pop-up widow, there are two option tabs, Crop and Effect.
Just directly drag the dotted frame to crop the video,and besides you can reverse the video as X-Reverse of Y-Reverse.
In the Effect panle, you can make effects for the video with contrast,saturation,etc. for your video.

 

 

Output settings are mainly forcus on Video and Audio settings.You can change some references for your videos,and if you are not sure about the settings, just leave the Default model for the output files.