lavc/flashsv2enc: Fix encoding resolution error message.
avfilter/vf_interlace: more accurate pts calculation

Signed-off-by: Aleksey Vasenev <margtu-fivt@ya.ru>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/vf_tinterlace: fix frame rate

Signed-off-by: Aleksey Vasenev <margtu-fivt@ya.ru>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>