At the core and vout, you now have 2 variables:
 - deinterlace: on/off/auto (off is default). It let you say if you
 want to deinterlace or not.
 - deinterlace-mode: discard, blend, ... (blend is default). It let you
 specify the mode used when deinterlacing is equal to on/auto.

 The mode auto is not yet supported and simply default to on.