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.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@23056 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

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;
 }