#1 Subband length checking.

[Yufei Yuan]

In DownConverter::dodownconvert():

The loops for handling trailing edge generates a seg
fault when the columns of a subband is too short. This
bug showes up when a QCIF sequence is encoded.

So subband length checking should be imposed in
downconvert.cpp

Attached is the patched file.

Rgds,
Yufei

[Yufei Yuan]

[Yufei Yuan]

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[Thomas Davies]

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Thanks. It might be easier to just reduce the number of
downconversions used for small pictures (it's only an
encoder-side thing to get motion vectors by doing the
estimation first on smaller pictures). I'll have to think about it!

Thanks,

Thomas