Create and add a filter instance into an existing graph.
The filter instance is created from the filter filt and inited
with the parameters args and opaque.
In case of success put in *filt_ctx the pointer to the created
filter instance, otherwise set *filt_ctx to NULL.
@param name the instance name to give to the created filter instance
@param graph_ctx the filter graph
@return a negative AVERROR error code in case of failure, a non
negative value otherwise
Create and add a filter instance into an existing graph. The filter instance is created from the filter filt and inited with the parameters args and opaque.
In case of success put in *filt_ctx the pointer to the created filter instance, otherwise set *filt_ctx to NULL.
@param name the instance name to give to the created filter instance @param graph_ctx the filter graph @return a negative AVERROR error code in case of failure, a non negative value otherwise