vcd:

[1] VLC command-line help - VideoLAN Wiki (2017-10-10 19:17:15 +09:00) <https://wiki.videolan.org/VLC_command-line_help/>

vcd://[device] VCD device

[2] MPlayer - The Movie Player (2018-04-18 05:15:11 +09:00) <http://www.mplayerhq.hu/DOCS/HTML/en/MPlayer.html#vcd>

The Syntax for a standard Video CD (VCD) is as follows:
mplayer vcd://<track> [-cdrom-device <device>]
Example:
mplayer vcd://2 -cdrom-device /dev/hdc