avcodec/mjpegdec: fix rounding of chroma_height

Fixes green line at the bottom
Fixes Ticket3913

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/ebur128: rework channel weighting definition code

Should fix CID1194399 (Bad bit shift operation)
avformat/mpegts: fix spelling error

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