Refer the H264 encoder user guide under ti_tools/codecs/REL.500.V.H264AVC.E.IVAHD.02.00.xx.00\500.V.H264AVC.E.IVAHD.02.00\IVAHD_001\Docs for slice coding configuration.
You can also check these posts for slice coding configuration. SOme of the posts are ezssdk related but codec configuration applies to dvrrdk as well
http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/274152.aspx
http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/p/278942/975913.aspx#975913
http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/280685.aspx
http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/p/313279/1090497.aspx#1090497