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wat. fix weird crash after libs were updated

--- a/frame.c

+++ b/frame.c

@@ -7,19 +7,23 @@

 {

 	Frame *f;

+	assert(w > 2 && h > 2);

+	assert(ystride > 2 && uvstride > 2);

+	assert(yuv[0] != nil && yuv[1] != nil && yuv[2] != nil);

+

 	if((f = malloc(sizeof(*f) + (ystride+uvstride)*h)) == nil)

 		return nil;

 	f->w = w;

 	f->h = h;

+	f->ystride = ystride;

+	f->uvstride = uvstride;

 	f->yuv[0] = f->data;

+	f->yuv[1] = f->yuv[0] + ystride*h;

+	f->yuv[2] = f->yuv[1] + uvstride*h/2;

 	memmove(f->yuv[0], yuv[0], ystride*h);

-	f->yuv[1] = f->data + ystride*h;

 	memmove(f->yuv[1], yuv[1], uvstride*h/2);

-	f->yuv[2] = f->data + ystride*h + uvstride*h/2;

 	memmove(f->yuv[2], yuv[2], uvstride*h/2);

-	f->ystride = ystride;

-	f->uvstride = uvstride;

 	return f;

 }