There have been a couple of questions on playing VCDs in Linux, like this one - but many years have passed since then.
I'm trying to play a VCD on Devuan 3 Beowulf (~= Debian 10 Buster without systemd). I can mount the disk; but MPV won't recognize it, and if I try "Open Disc" using VLC (the VideoLan player), I get the error message:
Your input can't be opened:
VLC is unable to open the MRL 'vcd:///media/cdrom0'. Check the log for details.
I don't know why it's failing, plus - since when does VLC have a log?