With powerful DVD Ripper for Mac, you can rip DVDs to AVI, MKV, WMV and various other formats including MPEG, MP4, DivX, H.264/AVC, FLV, MOV, 3GP, MP3, WAV, AC3, M4A on Mac OS X (Leopard and Snow Leopard)
Der's a lot of free video converters on d internet. 1 very use full syt is www.CNET.com den search d word free video converters. am using xilisoft video converter.
Hi, here, I think you may make a mistake to distinguish the video converer and the DVD ripper/converter, most of the common video converter can not accpet dvd disc or file, if you hope to convert dvd to mkv, you need a related dvd ripper or converter and then you can do that. Just use the search engine like yahoo, you will find a lot of DVD to MKV converter which can help you convert DVD to MKV, I find my one WonderFox DVD Ripper is through this way, so it may help you. If you need one directly, you can also try the WonderFox DVD Ripper: http://www.videoconverterfactory.com/dvd-ripper/
In a word, I hope your problem will be solved.