Debian Jessie Multimedia
Written by ⓘⓓⓔⓝⓣⓛⓤⓓ - -

Playing any audio files comes natively with the platform. Watching a video recorded from your phone is easy once the video has been downloaded to the computer where Jessie is installed.
Some DVDs are directly playable and some of them require libdvcss which is not provided on debian repositories because of legal stuff but it can be downloaded as a debian package from videolan.
Flash video playing is not pre-installed. There is a way to install Flash but more and more websites use HTML5 video tag to provide video content. This makes Flash quit useless. But anyway it can still be installed if you add "non-free" repository to your package repository configuration. There are plenty of sites to show you how to do that ...
There are some websites that propose videos on .mp4 format. This working very well with a default install in Iceweasel. The solution is simply to install ffmpeg plugin for gstreamer :
sudo apt install gstreamer0.10-ffmpegI don't have a blue-ray drive so I can't tell how well blue-ray is working on Debian Jessie ...
Perhaps there are some other tricks for an advanced usage of multimedia that I'm not aware of !