Fix "knwon" typo and add a check in tools/patcheck

Signed-off-by: Paul B Mahol <onemda@gmail.com>
au: use ff_raw_write_packet()
mpegpsenc: restructure SCR handling

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
mpegpsenc: Fix SCR handling for DVD

This makes the initial SCR equal 0

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
mpegpsenc: move preload recalculation to where its needed

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
mpegpsenc: show first SCR/DTS at debug level

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
mpegpsenc: avoid shifting dts/pts

Only shift if needed to avoid negative scr when requested
or for dvd.

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