avfilter/crop: avoid premature eval error

Width and height expressions can refer to each other. Width is
evaluated twice to allow for reference to output height. So we
should not error out upon failure of first evaluation of width.

diff --git a/libavfilter/vf_crop.c b/libavfilter/vf_crop.c
index d6b4feb5136e2cd9c0ca625ba8e06bf9567da998..9bf4077c5d2c70321caef41dece77691871e249c 100644 (file)
--- a/libavfilter/vf_crop.c
+++ b/libavfilter/vf_crop.c
@@ -174,10 +174,9 @@ static int config_input(AVFilterLink *link)
         s->vsub = pix_desc->log2_chroma_h;
     }
 
-    if ((ret = av_expr_parse_and_eval(&res, (expr = s->w_expr),
-                                      var_names, s->var_values,
-                                      NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
-        goto fail_expr;
+    av_expr_parse_and_eval(&res, (expr = s->w_expr),
+                           var_names, s->var_values,
+                           NULL, NULL, NULL, NULL, NULL, 0, ctx);
     s->var_values[VAR_OUT_W] = s->var_values[VAR_OW] = res;
     if ((ret = av_expr_parse_and_eval(&res, (expr = s->h_expr),
                                       var_names, s->var_values,