try
mplayer -ao alsa:device=iec958
there are two digital out (spdif and hdmi)
Node 0x1b [Pin Complex] wcaps 0x40030d: Stereo Digital Amp-Out
Control: name="IEC958 Playback Volume", index=0, device=0
ControlAmp: chs=3, dir=Out, idx=0, ofs=0
Amp-Out caps: ofs=0x27, nsteps=0x27, stepsize=0x05, mute=1
Amp-Out vals: [0x00 0x00]
Pincap 0x00000010: OUT
Pin Default 0x0145f1a0: [Jack] SPDIF Out at Ext Rear
Conn = Optical, Color = Other
DefAssociation = 0xa, Sequence = 0x0
Misc = NO_PRESENCE
Pin-ctls: 0x40: OUT
Connection: 1
0x02
Node 0x1d [Pin Complex] wcaps 0x40030d: Stereo Digital Amp-Out
Control: name="HDMI Playback Volume", index=0, device=0
ControlAmp: chs=3, dir=Out, idx=0, ofs=0
Amp-Out caps: ofs=0x27, nsteps=0x27, stepsize=0x05, mute=1
Amp-Out vals: [0x27 0x27]
Pincap 0x00000010: OUT
Pin Default 0x1856f1b0: [Jack] Digital Out at Int HDMI
Conn = Digital, Color = Other
DefAssociation = 0xb, Sequence = 0x0
Misc = NO_PRESENCE
Pin-ctls: 0x40: OUT
Connection: 1
0x0b
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https://bugs.launchpad.net/bugs/1040283
Title:
Alsa does not allow connections either directly or from pulseaudio.
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