Graphics, sound and multimedia • No QtMultimedia backends found

Code:

(venv) alpha@pi:~/PuniPi $ python mediaplayer.py No QtMultimedia backends found. Only QMediaDevices, QAudioDevice, QSoundEffect, QAudioSink, and QAudioSource are available.Failed to initialize QMediaPlayer "Not available"Failed to create QVideoSink "Not available"

Code:

sudo apt-get install libavformat58 libavcodec58 libavutil56 libswresample3Hit:1 http://deb.debian.org/debian bookworm InReleaseHit:2 http://deb.debian.org/debian-security bookworm-security InReleaseGet:3 http://deb.debian.org/debian bookworm-updates InRelease [55.4 kB]Get:4 http://deb.debian.org/debian bullseye-backports InRelease [49.0 kB]Hit:5 http://archive.raspberrypi.com/debian bookworm InReleaseFetched 104 kB in 1s (144 kB/s)Reading package lists... DoneReading package lists... DoneBuilding dependency tree... DoneReading state information... DoneSome packages could not be installed. This may mean that you haverequested an impossible situation or if you are using the unstabledistribution that some required packages have not yet been createdor been moved out of Incoming.The following information may help to resolve the situation:The following packages have unmet dependencies: libavcodec58 : Depends: libaom0 (>= 1.0.0) but it is not installable                Depends: libcodec2-0.9 (>= 0.9.2) but it is not installable                Depends: libdav1d4 (>= 0.2.1) but it is not installable                Depends: libvpx6 (>= 1.6.0) but it is not installable                Depends: libwebp6 (>= 0.5.1) but it is not installable                Depends: libx264-160 (>= 2:0.160.3011+gitcde9a93) but it is not installable                Depends: libx265-192 (>= 3.2) but it is not installable libavformat58 : Depends: libsrt1.4-gnutls (>= 1.4.2) but it is not installableE: Unable to correct problems, you have held broken packages.