I'm on Ubuntu Wily.
sudo apt-get install libavcodec56
yields:
Package libavcodec56 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
libavcodec-extra-56
That's fine and dandy until trying to install that package:
Package libavcodec-extra-56 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
libavcodec56
Here is my sources.list
, stripped of whitespace and comments:
deb http://us.archive.ubuntu.com/ubuntu/ wily main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ wily main restricted universe multiverse
deb http://us.archive.ubuntu.com/ubuntu/ wily-security main restricted universe multiverse
deb http://us.archive.ubuntu.com/ubuntu/ wily-updates main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ wily-security main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ wily-updates main restricted universe multiverse
deb http://archive.canonical.com/ubuntu wily partner
deb-src http://archive.canonical.com/ubuntu wily partner
apt-cache policy libavcodec*
. Install the latest "candidate" version. – Jos Apr 06 '16 at 17:31