Due to a typo in videogen.c, the regression test videos were not as

complex as originally planned.
Typo fixed (the background moves less linear now) and regression test
results updated.

Originally committed as revision 19478 to svn://svn.ffmpeg.org/ffmpeg/trunk

tests/videogen.c

@@ -222,7 +222,7 @@ static void gen_image(int num, int w, int h)
     for(y=0;y<h;y++) {
         for(x=0;x<w;x++) {
             x1 = (x << FRAC_BITS) + dx;
-            y1 = (y << FRAC_BITS) + dx;
+            y1 = (y << FRAC_BITS) + dy;
             r = ((y1 * 7) >> FRAC_BITS) & 0xff;
             g = (((x1 + y1) * 9) >> FRAC_BITS) & 0xff;
             b = ((x1 * 5) >> FRAC_BITS) & 0xff;