[MacPorts] #60966: mpv @0.32.0: fails to play: Assertion failed: (group_index >= 0)

[MacPorts]

#60966: mpv @0.32.0: fails to play: Assertion failed: (group_index >= 0)
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  Reporter:  mrkapqa  |      Owner:  Ionic
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  mpv      |
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Comment (by i0ntempest):

 You need to install mpv with +debug and with the source code retained in
 the build dir (stop macports from cleaning after installing using
 {{{-k}}}), then run lldb to get a stack trace to submit to the devs.
 {{{lldb /opt/local/bin/mpv}}} to initialize lldb, then inside lldb type
 {{{run /path/to/your/file}}} to trigger the crash, then {{{bt all}}} gives
 you the stack trace. Submit this to your issue and hopefully they'll take
 a look.

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Ticket URL: <https://trac.macports.org/ticket/60966#comment:7>
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