MPEG1 encoding artifacts

I don't suppose Andrew Stevens is still involved with the project, is he?  (As if I have any right to ask. :-)  The latest mpeg2enc seems to generate a lot of artifacts when I try to use it to make VideoCD-grade video.  Attached to this letter is a JPEG with an example.  (The DVD-grade video I made at the same time looks perfect.)

I have a 160k clip.yuv.bz2 file that can be used to reproduce the problem, plus the shell script that produced the clip.

Alternately, does anyone know what path should be followed to learn the mpeg2enc code to the point where one can actively develop it?  The last time I looked at it, I couldn't make heads or tails of anything, but I'm probably missing lots of necessary background info.

Steven Boswell

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