Black screen while using x264 with AVC Intra 100

Hey,
I've got Premiere Pro CS6 and I've started testing the use of x264 with Dxtory. The problem I face is that the footage is incompatible with every sequence preset (as far as I know) apart from AVC Intra 100 (AVC Intra 100 1080p 30fps is the one I'm trying to use). However when I use this preset all that the preview gives me is a black screen wheras the audio is playing perfectly. This isn't urgent as it's always possible to just convert the footage to MP4 with Handbrake however not being able to use this codec would be a shame, especially since I've seen others using it without any problems at all.
Thanks,
Lawrie

I'm not familiar with x264 or Dxtory, but a search of the forum for "x264" and "black" led to this thread: http://forums.adobe.com/message/4733946#4733946.
Which leads me to ask: what is the extension of the file? A little research on Dxtory leads me to suspect that it's an .avi. According to the thread above, Premiere does not support x264 content in an AVI wrapper.

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