What issues do you speak of?
The main downer about 1156 is its lack of pcie lanes. The best you can get is 16x/4x and 8x/8x/4x. Keep in mind however that a 5870 only loses 2% frames average from an 8x slot. This should be irrelevant to you though.
For an encoding system i'd take a look at my apps. If you can use the 6 cores the 1055T is definitely worth it. If not the i5 is going to be faster by a significant margin.