It seems https://developer1.toradex.com have been down few days now, this breaks the Yocto building. Workround is to edit recipe tdx-reference-multimedia-image.bb and remove package “media-files”. After this Yocto Qt demo app do not launch correctly, I can see “No such file or directory” error message.
WARNING: media-files-1.0-r0 do_fetch: Failed to fetch URL https://developer1.toradex.com/files/toradex-dev/uploads/media/Colibri/AddSW/Linux/ReleaseTest/media-files-1.0.tar.xz, attempting MIRRORS if available