All shows that are pushed to a TiVo, regardless of codec, are blocked by the Stream.
We need someone who has a cable system that broadcasts in H.264 to test if codec is really an issue or not. (there are a few broadcasting a few channels in H.264)
As I mentioned in another thread all H.264 is NOT alike. So even though a program may be in H.264 on the TiVo does not mean it can be passed through directly to the iPad. It'll likely have to go through the same transcoding process as MPEG-2. However it'll obviously require a different decoder to function so it may not be configured to handle that yet.
Developer for VideoReDo