No cropdetect filter?

[bvitaliyg]

Hey there, and thank you for this great project!

While using it for video crop detection, I've discovered that filter 'cropdetect' doesn't seem the be available. Can you please make it available in the next release?

I coudn't find the ffmpeg binaries that has to be built-in into the package. How do I need to to find them?

P.S. The code snippet in the README.md ("Read an audio file") doesn't appear to be a valid code anymore.