Re: correct syntax for combining filters

The Wanderer <[email protected]> Thu, 15 Apr 2021 12:48:23 -0400

Newsgroups	gmane.comp.video.mplayer.user
Organization	This space intentionally left blank.
Message-ID	<[email protected]>

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
scaletempo=scale=1.2:speed=pitch,lavcresample=44100,equalizer=0:0:0:0:0:0:0:0:7:7
-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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