$ ldd /usr/bin/ffmpeg | grep libav
	libavdevice.so.57 => /usr/lib/x86_64-linux-gnu/libavdevice.so.57 (0x00007f898ffc6000)
	libavfilter.so.6 => /usr/lib/x86_64-linux-gnu/libavfilter.so.6 (0x00007f898fb63000)
	libavformat.so.57 => /usr/lib/x86_64-linux-gnu/libavformat.so.57 (0x00007f898f728000)
	libavcodec.so.57 => /usr/lib/x86_64-linux-gnu/libavcodec.so.57 (0x00007f898e158000)
	libavresample.so.3 => /usr/lib/x86_64-linux-gnu/libavresample.so.3 (0x00007f898df37000)
	libavutil.so.55 => /usr/lib/x86_64-linux-gnu/libavutil.so.55 (0x00007f898d5e4000)
	libavc1394.so.0 => /usr/lib/x86_64-linux-gnu/libavc1394.so.0 (0x00007f8989c28000)