mythcenter kernel: ivtv0 warning: ENC: DMA still Pending while s
topping capture!
mythcenter kernel: ivtv0 warning: ENC: (0) DMA Error 0x0000000b
mythcenter kernel: ivtv0 warning: ENC: (1) DMA Error 0x0000000b
mythcenter kernel: ivtv0 warning: ENC: (2) DMA Error 0x0000000b 
mythcenter kernel: ivtv0 warning: ENC: REG_DMAXFER 2 wait failed
mythcenter kernel: ivtv0 warning: ENC: DMA still Pending while s
topping capture!

I wonder if compiling 0.7.2 would help this, I offer this excerpt form the 0.7.1 changelogs, I am currently running 0.7.0-cvs the default from an KP R5D1 install:
0.7.1 stable release
	- Add getopt support to test/vbi. Add new timeout option.
	- Fix South African broadcast frequency table.
	- Detect and workaround DMA offsets that can be introduced by
	  a DMA error.
	- Sliced VBI always uses PIO, never DMA.