COLOR_FUNC       1996 libavfilter/vf_waveform.c COLOR_FUNC(column,        1, 0)
COLOR_FUNC       1997 libavfilter/vf_waveform.c COLOR_FUNC(row_mirror,    0, 1)
COLOR_FUNC       1998 libavfilter/vf_waveform.c COLOR_FUNC(row,           0, 0)