-msglevel all=level:module=level:...
    Control verbosity directly for each module.  The 'all' module changes the verbosity of all the modules not explicitly speci-fied on the command line.  See '-msglevel help' for a list of all modules.
    NOTE: Some messages are printed before the command line is parsed and are therefore not affected by -msglevel.   To  control these messages you have to use the MPLAYER_VERBOSE environment variable, see its description below for details.
              Available levels:
                 -1   complete silence
                  0   fatal messages only
                  1   error messages
                  2   warning messages
                  3   short hints
                  4   informational messages
                  5   status messages (default)
                  6   verbose messages
                  7   debug level 2
                  8   debug level 3
                  9   debug level 4
根據man的指示!!
有問題問man果然是正確的XDD
 
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