Recording Video: Strange interleave after capture
 

I have the Pinacle PCTV.

I capture with the 352x576 (PAL) resolution to get both fields (forced with preview in VirtDub). Then when i look to the result I have very good quality on the begin of movie, but after a litle time somethings strange happends with one of the fields. It looks that one of the fields are shifted to the right. Whats is going wrong and what can I do to fix it ?

-----------------..... Field A
.....----------------- Field B
-----------------..... Field A
.....----------------- Field B
-----------------..... Field A
.....----------------- Field B





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