@param filter_ctx put here a pointer to the created filter context
on success, NULL on failure
@param filter the filter to create an instance of
@param inst_name Name to give to the new instance. Can be NULL for none.
@return >= 0 in case of success, a negative error code otherwise
@deprecated use avfilter_graph_alloc_filter() instead
Create a filter instance.
@param filter_ctx put here a pointer to the created filter context on success, NULL on failure @param filter the filter to create an instance of @param inst_name Name to give to the new instance. Can be NULL for none. @return >= 0 in case of success, a negative error code otherwise @deprecated use avfilter_graph_alloc_filter() instead