[MPlayer-users] correct syntax for combining filters

The Wanderer wanderer at fastmail.fm
Thu Apr 15 19:48:23 EEST 2021

On 2021-04-15 at 10:08, Christian wrote:

> Hi all,
> I´m looking for the right way to combine filters in *mplayer*.
> I want to achieve the following:
> I´d like to play a .wav-file with the *equalizer*-option set and the 
> *higher-speed*-option (plus: *not altering the pitch* when playing
> faster).
> Man-pages say:
> -af <filter1[=parameter1:parameter2:...],filter2,...>
>                Setup a chain of audio filters.
> Seems that´s what I´m looking for.

Notice the comma in the above, before 'filter2'.

> This command however doesn´t work:
> mplayer -af scaletempo=scale=1.2:speed=pitch -srate 44100 -af 
> lavcresample=44100 -af equalizer=0:0:0:0:0:0:0:0:7:7 test.wav
> I.e.: the equalizer option does work (audio is much crisper) but it´s 
> all played back at normal speed (not with the factor of "1.2").
> Could anybody help me with the correct syntax?

I haven't tried this myself, and don't have much experience with using
filters, but I'd suggest you see what you get from:

mplayer -af
-srate 44100 test.wav

My guess is that each time you specified the '-af' option, it was
overriding the value you set with the previous time, so that in the end
only the equalizer filter was being applied.

   The Wanderer

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all
progress depends on the unreasonable man.         -- George Bernard Shaw

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