Record and playback function not functioning in bigbluebutton installed in ubuntu server

1. I have removed all previous files created by ffmpeg installation, from Ubuntu server, using the commands,
(a) sudo apt-get autoremove $(dpkg -l | grep ffmpeg | awk '{print $2}' | tr '\n' ' ')
b) sudo apt-get --purge remove $(dpkg -l | grep ffmpeg | awk '{print $2}' | tr '\n' ' ').

2. I have again installed ffmpeg, using commands;
(a) chmod 755 install-ffmpeg.sh
(b) ./install-ffmpeg.sh

Then the result is as follows:

make: *** No rule to make target '/tests/Makefile'. Stop.

checkinstall 1.6.2, Copyright 2009 Felipe Eduardo Sanchez Diaz Duran
This software is released under the GNU GPL.

***********************************************
****** Debian package creation selected ******
***********************************************

This package will be built according to these values:

0 - Maintainer:
1 - Summary:
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12 - Conflicts
13 - Replaces

Enter a number to change any of them or press ENTER to continue:

Installing with make install...

======================== Installation results =========================
Makefile:2: config.mak: No such file or directory
Makefile:58: /common.mak: No such file or directory
Makefile:98: /libavutil/Makefile: No such file or directory
Makefile:98: /library.mak: No such file or directory
Makefile:100: /doc/Makefile: No such file or directory
Makefile:183: /tests/Makefile: No such file or directory
make: *** No rule to make target '/tests/Makefile'. Stop.

**** Installation failed. Aborting package creation.

Cleaning up...OK

Bye.