Does Theora Decoder in libavcodec (FFMPEG V0.5) support YUV422 YUV444 modes?

Does Theora Decoder in libavcodec (FFMPEG V0.5) support YUV422 YUV444 modes? I am working on theora decoder in ffmpeg V0.5. When i try to decode a 422 or 444 ogg/ogv bit stream using ffmpeg, the output yuv is junk. When i checked the ffmpeg source code, i saw that a pixel format is hardcoded to PIX_FMT_YUV420P.
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