[encode-audio] Use ./* so names with dashes won't become options.
See https://github.com/koalaman/shellcheck/wiki/SC2035 for more details.
[encode-compile] Removed unneeded cats and quotes to prevent globbing and word splitting.
[encode-compile] Changed single-quotes for double-quotes, removed antiquidated expr.
Expressions won't expand in single quotes, so double quotes are needed.
[encode-merge] Use ./* so names with dashes won't become options.
[encode-video] Use bash arithmetic in place of deprecated expr.
[encode-video-parallel] Use 'crf' variable for crf value
Merge pull request #2 from breed808/script_fixes

Script fixes