Many of my friends use iDealshare VideoGo to convert DVR to AVI.

Today, I just have a try and find it really works perfect.

It can convert DVR to AVI, MP4, WMV, MOV, 3GP, FLV, MKV, WTV, DV, RMVB, ASF, WebM, and etc video format.

It even convert DVR to MP3, WAV, M4A audio format.

More exciting, it features editing features like trim, merge, crop, increase audio volume, split, rotate and etc.

Now I like to share this step by step guide here: http://www.idealshare.net/video-converter/dvr-converter.html

Hope it also helps for you.

You may try iDealshare VideoGo which can batch convert FLV to MP4, AVI, MPEG, WMV,  MOV, iPod, iPad, iPhone etc on Mac or Windows computer