Show notifications when playing Local Files on Linux

[LaggyKar]

Spotify shows a desktop notification when it starts playing a new track. However, this only gets shown for streamed tracks, not when it starts playing a local file. At least on Linux.

[LaggyKar]

System info:

Operating System: openSUSE Leap 15.5
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Kernel Version: 5.14.21-150500.55.12-default (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 1700X Eight-Core Processor
Memory: 62.7 Gibyte of RAM
Graphics Processor: NVIDIA GeForce GT 1030/PCIe/SSE2

It's possible that https://community.spotify.com/t5/Idea-Submissions/Show-local-file-cover-art-via-MPRIS/idi-p/5624092 is related to this (if the notifications fail to show up due to issues with the icon). Another issue that may be related is that local file cover art doesn't get used for playlist/folder cover art. So if you've got a playlist with only local files, it just gets a generic playlist icon.

[LaggyKar]

System log from when I started playing a local track:

aug 25 10:57:45 raven plasmashell[32233]: [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f89888bf800] stream 0, timescale not set
aug 25 10:57:45 raven plasmashell[32233]: [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f89888bf800] Could not find codec parameters for stream 1 (Video: mjpeg, none): unspecified size
aug 25 10:57:45 raven plasmashell[32233]: Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
aug 25 10:57:47 raven xdg-desktop-por[3012]: Backend call failed: No such object path '/org/freedesktop/portal/desktop'
aug 25 10:57:47 raven plasmashell[17663]: 10:57:47.048 › Error: user interaction failed
aug 25 10:57:47 raven plasmashell[32233]: [aac @ 0x7f89890f7500] Multiple frames in a packet.
aug 25 10:57:47 raven plasmashell[32233]: [aac @ 0x7f89890f7500] Gain control is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
aug 25 10:57:47 raven plasmashell[32233]: [aac @ 0x7f89890f7500] channel element 0.0 is not allocated
aug 25 10:57:47 raven plasmashell[31063]: kde.dataengine.mpris: "org.mpris.MediaPlayer2.spotify" has an invalid URL for the mpris:artUrl entry of the "Metadata" property