Report audiovisual metrics via libavfilter

Current versions

Revision: 1

qcli requires the following formulae to be installed:
pkg-config 0.29.2 Manage compile and link flags for libraries
qwt 6.1.3_4 Qt Widgets for Technical Applications
qt 5.10.1 Cross-platform application and UI framework
ffmpeg 3.4.2 Play, record, convert, and stream audio and video

Recent formula history

Zhiming Wang qcli: revision for ffmpeg
Dominyk Tiller qcli: use assert_predicate
ilovezfs qcli 0.9
Dave Rice qcli 0.8 (new formula)

Formula code at GitHub