Issue a more general message when the function which sets an option

fails.

It may fail not only because of an invalid value for the option, but
also for other reasons, e.g. memory problems etc.

Originally committed as revision 22738 to svn://svn.ffmpeg.org/ffmpeg/trunk

cmdutils.c

@@ -170,7 +170,7 @@ unknown_opt:
                 *po->u.float_arg = parse_number_or_die(opt, arg, OPT_FLOAT, -1.0/0.0, 1.0/0.0);
             } else if (po->flags & OPT_FUNC2) {
                 if (po->u.func2_arg(opt, arg) < 0) {
-                    fprintf(stderr, "%s: invalid value '%s' for option '%s'\n", argv[0], arg, opt);
+                    fprintf(stderr, "%s: failed to set value '%s' for option '%s'\n", argv[0], arg, opt);
                     exit(1);
                 }
             } else {