Ok, a instalação deste corrigiu o problema:
sudo apt install gstreamer1.0-vaapi
Eu achei que tinha instalado todos os codecs "proprietários" agora, clicando duas vezes em alguns dos meus vídeos, e Totem me pedindo para instalar pacotes. No entanto, há um tipo de vídeos que não me pedem para instalar pacotes e não estão sendo reproduzidos pelo Totem (eles costumavam trabalhar em versões anteriores do Ubuntu, não lembro como), eles simplesmente dão o erro Internal data stream error , e nada será impresso no console se eu executar o totem dele.
Então, como instalar codecs flv para o Totem no Ubuntu 16.04 LTS?
Eu tentei o seguinte:
$ sudo apt install gstreamer1.0-*
No entanto, esse erro é exibido:
Building dependency tree
Reading state information... Done
Note, selecting 'gstreamer1.0-plugins-ugly-amr' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-videosink' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-alsa' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-plugins-ugly-dbg' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-plugins-ugly-doc' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-plugins-base-apps' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-hybris:i386' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-tools' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-plugins-good' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-qapt' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-espeak' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-nice' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-videosource' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-crystalhd' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-fluendo-mp3' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-plugins-bad' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-plugins-base' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-audiosource' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-plugins-bad-videoparsers' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-plugins-really-bad' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-clutter' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-pulseaudio' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-pocketsphinx' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-plugins-bad-dbg' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-plugins-bad-doc' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-visualization' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-plugins-bad-faad' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-lame' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-x' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-vaapi-doc' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-libav' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-plugins-base-dbg' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-plugins-good-dbg' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-plugins-base-doc' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-plugins-good-doc' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-dvswitch' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-clutter-3.0' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-vaapi' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-libav-dbg' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-packagekit' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-ffmpeg' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-plugins-ugly' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-doc' for glob 'gstreamer1.0-*'
Note, selecting 'gstreamer1.0-audiosink' for glob 'gstreamer1.0-*'
gstreamer1.0-clutter-3.0 is already the newest version (3.0.18-1).
gstreamer1.0-clutter-3.0 set to manually installed.
gstreamer1.0-plugins-ugly is already the newest version (1.8.0-1ubuntu1).
gstreamer1.0-plugins-ugly-amr is already the newest version (1.8.0-1ubuntu1).
gstreamer1.0-plugins-ugly-amr set to manually installed.
gstreamer1.0-plugins-base is already the newest version (1.8.1-1ubuntu0.1).
gstreamer1.0-plugins-base set to manually installed.
gstreamer1.0-libav is already the newest version (1.8.1-1~ubuntu1).
gstreamer1.0-pulseaudio is already the newest version (1.8.1-1ubuntu0.1).
gstreamer1.0-pulseaudio set to manually installed.
gstreamer1.0-tools is already the newest version (1.8.1-1~ubuntu1).
gstreamer1.0-tools set to manually installed.
gstreamer1.0-plugins-base-apps is already the newest version (1.8.1-1ubuntu0.1).
gstreamer1.0-plugins-base-apps set to manually installed.
gstreamer1.0-plugins-good is already the newest version (1.8.1-1ubuntu0.1).
gstreamer1.0-plugins-good set to manually installed.
gstreamer1.0-x is already the newest version (1.8.1-1ubuntu0.1).
gstreamer1.0-x set to manually installed.
gstreamer1.0-alsa is already the newest version (1.8.1-1ubuntu0.1).
gstreamer1.0-alsa set to manually installed.
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
gstreamer1.0-hybris:i386 : Depends: libgstreamer-plugins-bad1.0-0:i386 (>= 1.8.0) but it is not going to be installed
Depends: libgstreamer-plugins-bad1.0-0:i386 (< 1.8.1) but it is not going to be installed
Depends: libgstreamer-plugins-base1.0-0:i386 (>= 1.0.0) but it is not going to be installed
Depends: libgstreamer1.0-0:i386 (>= 1.4.0) but it is not going to be installed
Depends: libmedia1:i386 but it is not going to be installed
gstreamer1.0-libav-dbg : Depends: gstreamer1.0-libav (= 1.8.0-1) but 1.8.1-1~ubuntu1 is to be installed
gstreamer1.0-plugins-base-dbg : Depends: gstreamer1.0-alsa (= 1.8.0-1ubuntu1) but 1.8.1-1ubuntu0.1 is to be installed
Depends: gstreamer1.0-plugins-base (= 1.8.0-1ubuntu1) but 1.8.1-1ubuntu0.1 is to be installed
Depends: gstreamer1.0-x (= 1.8.0-1ubuntu1) but 1.8.1-1ubuntu0.1 is to be installed
Depends: libgstreamer-plugins-base1.0-0 (= 1.8.0-1ubuntu1) but 1.8.1-1ubuntu0.1 is to be installed
gstreamer1.0-plugins-good-dbg : Depends: gstreamer1.0-plugins-good (= 1.8.0-1ubuntu1) but 1.8.1-1ubuntu0.1 is to be installed
Depends: gstreamer1.0-pulseaudio (= 1.8.0-1ubuntu1) but 1.8.1-1ubuntu0.1 is to be installed
gstreamer1.0-vaapi : Depends: libva-drm1 (>= 1.1.0) but it is not going to be installed
Depends: libva-wayland1 (>= 1.3.0) but it is not going to be installed
Depends: libva-x11-1 (>= 1.0.3) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
Obrigado
Ok, a instalação deste corrigiu o problema:
sudo apt install gstreamer1.0-vaapi