proresenc: alpha coding support
lavfi/vignette: remove extra semi-colon.
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  proresenc: alpha coding support

Merged-by: Michael Niedermayer <michaelni@gmx.at>
jpeg2000dec: print more detailed cdx/y debug info

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
jpeg2000dec: fix indention

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>