Transcoding MPEG4 only if GMC or QPel

Is it possible to transcode MPEG4 (Xvid) video only if it uses GMC (Global motion compensation) or Qpel (Quarter-pixel motion compensation)? MediaInfo considers that "Advanced Simple@L5", but adding a levelGreaterThan="4.2" test for vCodec="mpeg4" results in all MPEG4 files being transcoded. The web page on transcoding says levelGreaterThan is only for H264. Is there any other test I could use?

I know I could remux it into a different container which always gets transcoded or maybe use ftypNotIn, but I would prefer a solution that doesn't require altering of files.

[zip]

level matching only works for h264, not mpeg4 part 2 (divx)