Iterate over all registered filters.
@param opaque a pointer where libavfilter will store the iteration state. Must point to NULL to start the iteration.
@return the next registered filter or NULL when the iteration is finished
See Implementation
Iterate over all registered filters.
@param opaque a pointer where libavfilter will store the iteration state. Must point to NULL to start the iteration.
@return the next registered filter or NULL when the iteration is finished