On Thu, 23 Jun 2016, Max Ludwig wrote:
> Hi,
>
> https://backports.debian.org/Instructions/ says:
>
> All backports are deactivated by default (i.e. the packages are pinned to
> 100 by using ButAutomaticUpgrades: yes in the Release files. If you want to
> install something from backports run:
> apt-get -t jessie-backports install "package"
>
> This seems to be wrong or at least unclear because apt-get install ffmpeg
> works just fine even though it's in jessie's backports.
It is perfectly right. It only works by accident if a package isn't available
in stable.
And in fact, even if a package isn't available in stable, installing like this may fail due to Depends/Breaks/Conflicts that need to pull in dependencies from backports; apt will often refuse to select these solutions without selecting -t jessie-backports.