BT.709 coefficients were gathered from the first two parts of BT.709 to BT.2020 conversion guide in ARIB STD-B62 (Pt. 1, Chapter 6.2.2). They were additionally confirmed by manually calculating values.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Avoid a compile-time dependency of the pad filter on libavcodec. Originally committed as revision 23940 to svn://svn.ffmpeg.org/ffmpeg/trunk