ff_ffplay: merge: e874772f70908ad5b1754c0373a35bec08fad547

Merge commit '21180b73239c6360aa28496d4879713b7ba4a8e5'

* commit '21180b73239c6360aa28496d4879713b7ba4a8e5':
  avplay: Factorize code for adding filters to the filter pipeline

Conflicts:
ffplay.c

See: 08c51e12b1c3f3e3e68e33eb46be7131df5b3682
Merged-by: NMichael Niedermayer <michaelni@gmx.at>