Why are these Debian v8 (Jessie)'s packages not needed since yesterday?

[Ant]

Hello.

...
Hit http://archive.debian.org jessie-backports/non-free i386 Packages
Reading package lists... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... The following packages were automatically installed and are no longer required:
i965-va-driver:i386 libgsm1:i386 libmp3lame0:i386 libopenjpeg5:i386
libschroedinger-1.0-0:i386 libspeex1:i386 libspeexdsp1:i386 libtheora0:i386
libva1:i386 libvdpau1:i386 libx264-142:i386 libxvidcore4:i386 va-driver-all:i386
vdpau-va-driver:i386
Use 'apt-get autoremove' to remove them.
Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

Why are these Debian v8 (Jessie)'s packages not needed since yesterday? :/

Thank you for reading and hopefully answering soon. :)

[Johann Beretta]

Post by Ant
Hello.

<snip>

Post by Ant
Why are these Debian v8 (Jessie)'s packages not needed since yesterday? :/
Thank you for reading and hopefully answering soon. :)

Generally it's because they have been superseded by different packages.
This can be the case of a different package having absorbed them,
perhaps there was a fork in the code and debian has incorporated the new
project, or it could be any number of other things. You can usually
drill in to the package in Aptitude and read the maintainer's notes
and/or see what packages have replaced them.