avfilter: add colorhold filter

Multimedia / FFmpeg - Paul B Mahol [gmail.com] - 11 May 2019 18:16 EDT

Fixes #7671.

59fb8cae5e avfilter: add colorhold filter
Changelog | 1 +
doc/filters.texi | 18 ++++++++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/version.h | 2 +-
libavfilter/vf_colorkey.c | 84 ++++++++++++++++++++++++++++++++++++++++++++++-
6 files changed, 105 insertions(+), 2 deletions(-)

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