Useful to only display lows/mids/highs.
768734a avfilter/vf_vectorscope: add threshold option
doc/filters.texi | 14 +++++++
libavfilter/vf_vectorscope.c | 84 ++++++++++++++++++++++++++++++++++++++++--
2 files changed, 95 insertions(+), 3 deletions(-)