Ffmpeg-normalize

* Format setup.py.

* Switch progress to external lib.

* Remove support for older versions.

* Adjusted handling of FFMPEG_PATH for binaries available via $PATH (149)

* adjusted handling of FFMPEG_PATH for binaries available via $PATH

fixes 147

* adjusted use of %s to {} to match style

* documented the feature

* condensed error message as other lines are longer

* Fix JSON output for multiple files.

* Update badge URL.

* Update README.md (142)

* Update README.md

Added example of verifying levels

Fixes 141

* shorten example, add link to wiki page

* Error if no ffmpeg exec exists.

* Add stalebot.

* Fixing stdin corruption caused by new subprocess (138)

* Update issue template.

* Create FUNDING.yml.

* Fix usage, addresses 132.

* Manually specify usage string, fixes 132.

* Fix local import for tests.

* Add extra input options.