fixed ffmpeg errors and added cli

bin/lib/ffmpeg/tox.ini

@@ -0,0 +1,24 @@
+# Tox (https://tox.readthedocs.io/) is a tool for running tests
+# in multiple virtualenvs. This configuration file will run the
+# test suite on all supported python versions. To use it, "pip install tox"
+# and then run "tox" from this directory.
+
+[tox]
+envlist = py27, py35, py36, py37, py38, py39, py310
+
+[gh-actions]
+python =
+    2.7: py27
+    3.5: py35
+    3.6: py36
+    3.7: py37
+    3.8: py38
+    3.9: py39
+    3.10: py310
+
+[testenv]
+commands = py.test -vv
+deps =
+    future
+    pytest
+    pytest-mock