Make config_props() show conversion information before to create the

swscale context.

This makes eventual warnings issued in case of swscale context
creation failure to be shown after the conversion information rather
than before, which is slightly less confusing.

Originally committed as revision 23056 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavfilter/vf_scale.c

@@ -128,10 +128,6 @@ static int config_props(AVFilterLink *outlink)
     outlink->h = h;
 
     /* TODO: make algorithm configurable */
-    scale->sws = sws_getContext(inlink ->w, inlink ->h, inlink ->format,
-                                outlink->w, outlink->h, outlink->format,
-                                scale->flags, NULL, NULL, NULL);
-
     av_log(ctx, AV_LOG_INFO, "w:%d h:%d fmt:%s -> w:%d h:%d fmt:%s flags:%0x\n",
            inlink ->w, inlink ->h, av_pix_fmt_descriptors[ inlink->format].name,
            outlink->w, outlink->h, av_pix_fmt_descriptors[outlink->format].name,
@@ -139,6 +135,10 @@ static int config_props(AVFilterLink *outlink)
 
     scale->input_is_pal = av_pix_fmt_descriptors[inlink->format].flags & PIX_FMT_PAL;
 
+    scale->sws = sws_getContext(inlink ->w, inlink ->h, inlink ->format,
+                                outlink->w, outlink->h, outlink->format,
+                                scale->flags, NULL, NULL, NULL);
+
     return !scale->sws;
 }