[MPlayer-dev-eng] [PATCH] fixing vf_sab

[Alexander Strange]

Currently -vf sab always crashes, because it calls sws_getContext with  
no scaling algorithm in the flags.
This used to work, since it's unscaled, but broke with:

------------------------------------------------------------------------
r27317 | michael | 2008-07-17 18:01:18 -0400 (Thu, 17 Jul 2008) | 2  
lines

Ensure that exactly one scaler algo is used.

and apparently I'm the only one who ever uses sab.
Attached patch fixes it; since it's unscaled, the algorithm flag is  
ignored anyway, but SWS_POINT seemed most correct.

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