v5

$ git log v4..v5 --oneline
924d4de bump to v5
dc9d9af add --version flag
195a6bd add support for passing RGBA colors
b6b9736 Add support for processing multiple files at once
739fc6d make the metadata margin customizable via --metadata-margin flag. close #8
549001e handle videos without an audio stream. close #5
85a2db4 handle special case where avg_framerate happens to be 0/0. close #9
f1716d3 actually use the -A flag
e70c66d Add -a (accurate capture mode) flag for capturing frames in accurate mode using ffmpeg.
b770a3c fix missing arch package dependencies