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I do not know exactly what is the ffmpeg Python package, but the genuine ffmpeg program is written in C, so i bet that the ffmpeg Python package is only an interface of the latter, see https://github.com/jiashaokun/ffmpeg. So you should install the ffmpeg from the distro by adding something like RUN apt-get apt-get install -y ffmpeg somewhere in you dockerfile.
 Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.
 
                
                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.