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[Alessandro Astone <2111560@xxxxxxxxxxxxxxxxxx>]

This seems to work fine on my Ubuntu 25.04

Are you able to extract the cover art with, for example, this ffmpeg command?
$ ffmpeg -i <input file>.m4a -an -vcodec copy <output file>.png

And what does Ubuntu's default thumbnailer say about it?
$ /usr/bin/totem-video-thumbnailer -v <input file>.m4a <output file>.png

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https://bugs.launchpad.net/bugs/2111560

Title:
  Nautilus does not show embedded album art thumbnails for .m4a files

Status in nautilus package in Ubuntu:
  New

Bug description:
  In Nautilus on Ubuntu 24.04, .mp3 files with embedded album art
  correctly show their covers as thumbnails. However, .m4a files -
  despite also having embedded artwork - do not show thumbnails at all.

  This seems inconsistent, as .m4a is a widely supported format and the
  cover art is confirmed to be embedded (checked with ffmpeg). The same
  .m4a file displays correctly on Android and Windows.

  Steps to reproduce:
  1. Use an .m4a file with embedded cover art.
  2. Place it in a folder and open it in Nautilus.
  3. Thumbnail is missing, while a similar .mp3 shows the cover.

  Expected:
  Nautilus should display the cover image embedded in the .m4a file as a thumbnail, just like it does for .mp3.

  Tested on:
  - Ubuntu 24.04
  - Nautilus 46.2

  Thank you!

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