#10 Cropping at odd boundaries causes bogus stripes

[Pa3PyX]

Looks like cropping at anything other than a multiple of 8
pixels height causes discolored stripes to appear at the
top of the picture. Possible fix: do all decoding first, and
post-processing then.

[Pa3PyX]

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(this is FlaskMPEG 0.7.8.39)