How to install the ffmpeg library for PHP applications created by ffmpeg-heroku?

I have been playing around with heroku deployment applications recently, and now I encounter a problem. My application needs to use the ffmpeg library. How can I install the ffmpeg library for the php application created by heroku?

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I have been playing around with heroku deployment applications recently, and now I encounter a problem. My application needs to use the ffmpeg library. How can I install the ffmpeg library for the php application created by heroku?

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