* commit '48a5adab':
  lavfi: add avfilter_init_str() to replace avfilter_init_filter().

avfilter_graph_create_filter() opaque is still passed to avfilter_init_filter()
which continues to pass it to init_opaque as its still used in the buffer sinks
the sinks should be changed and the opaque passing removed
Merged-by: Michael Niedermayer <michaelni@gmx.at>