h264_parser: Fix order of operations

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
h264_parser: Use ff_h264_reset_sei()

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
vf_fieldorder: log when processing is skipped

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
fate: add fieldorder filter test

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>