YV12 Overlay blitting problem

I’m trying to draw a simple surface with YUV Overlay (with SDL 1.2.6).

The source enclosed should draw some rectangles but it only draw some
begining pixels.

Is there a bug with YUV in SDL 1.2.6 or am I doing something wrong?


PS: I compiled ffmpeg and ffplay does the same thing on my machine (using
VESA fbcon)._________________________________________________________________
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