Encoding empty pictures

[Ixal]

For a test I need a empty yuv picture encoded into H.264 but both the x264 or the JM reference encoder produce very small files which the decoder I use can't read (even if its just an I picture) for some reason.

Is there a way to disable some functions which gets applied in such a special case? Maybe my decoder can read those pictures then.
Specifically I try to encode a single picture with 4x4 Blocks and as few optional functions as possible at the lowest level.

[Manao]

What macroblock types does your decoder support ? A completely uniform picture will most probably be encoded as intra 16x16, with different prediction types.

[Ixal]

Technically the decoder supports all types of MBs. The only thing it can't do is frame reordering.

But somehow the decoder has problems with uniform pictures. Whenever I try to decode them I get a parser error while "normal" pictures will decode fine.
Thats why I'm asking if there is some kind of special algorithm used for these kind of pictures.

[Manao]

No, there isn't. There must be a bug in your parser.