[x265] Issue #557: Expected final file size among encoding stats (multicoreware/x265)

[Elio Blanca]

New issue 557: Expected final file size among encoding stats
https://bitbucket.org/multicoreware/x265/issues/557/expected-final-file-size-among-encoding

Elio Blanca:

With this patch the encoder statistics also show the expected file size based on the current bitrate.

\(May be easily adapted to previous x265-3.3\)

Sorry for sending this using an ancient way of contribution but mercurial is just not my cup of tea.