lavfi/aselect: switch to an AVOptions-based system.

doc/filters.texi

@@ -6376,7 +6376,7 @@ This filter accepts the following options:
 
 @table @option
 
-@item expr
+@item expr, e
 An expression, which is evaluated for each input frame. If the expression is
 evaluated to a non-zero value, the frame is selected and passed to the output,
 otherwise it is discarded.

libavfilter/avfilter.c

@@ -766,6 +766,7 @@ int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque
         !strcmp(filter->filter->name, "unsharp"  ) ||
 //         !strcmp(filter->filter->name, "scale"      ) ||
         !strcmp(filter->filter->name, "select") ||
+        !strcmp(filter->filter->name, "aselect"  ) ||
         !strcmp(filter->filter->name, "volume"   ) ||
         !strcmp(filter->filter->name, "yadif"    ) ||
         0

libavfilter/f_select.c

@@ -388,8 +388,6 @@ static int query_formats(AVFilterContext *ctx)
     return 0;
 }
 
-static const char *const shorthand[] = { "expr", NULL };
-
 #if CONFIG_ASELECT_FILTER
 
 #define OFFSET(x) offsetof(SelectContext, x)
@@ -445,7 +443,6 @@ AVFilter avfilter_af_aselect = {
     .inputs    = avfilter_af_aselect_inputs,
     .outputs   = avfilter_af_aselect_outputs,
     .priv_class = &aselect_class,
-    .shorthand  = shorthand,
 };
 #endif /* CONFIG_ASELECT_FILTER */