[MPlayer-users] Mplayer makes small popping/static sound when speed_set is used

[Dominique Michel]

Le Sun, 16 Jul 2023 18:48:34 -0400,
Brad Hermanson <apeitheo at gmail.com> a écrit :

> Reimar,
> 
> This is the mplayer command I'm using:
> 
> mplayer -slave -osdlevel 0 -ao pulse -softvol -softvol-max 100
> -hr-mp3-seek -quiet -input file="pipe" -noconfig all -af
> equalizer=0:0:0:0:0:0:0:0:0:0,volnorm

Did you try it with -ao alsa or with -ao jack?

In fvwm-crystal, I use '-ao jack,alsa' and never get this issue. As
pulseaudio is not installed into my system, I cannot help you more.
> 
> It also loads the scaletempo filter with speed=pitch or speed=tempo
> sometimes depending on what that particular media is locked with. The
> clicking seems to happen regardless of what I use on -af.
> 
> By default, the "j" and "k" keys cause playback speed and pitch to
> lower or raise by echo'ing (it's just bash script) speed_set commands
> that would be equivalent to adjustments in, for example, semitones.
> 
> I got the idea in the mplayer man page:
> 
> "Add  `speed_mult  0.9438743126816935´  and  `speed_mult
>  1.059463094352953´ to your input.conf to step by musical semi-tones."
> 
> My program just calculates the correct numbers to adjust by anything,
> 12-EDO (semitone) and beyond. Default is currently 60-EDO.
> 
> If I'm understanding ChatGPT and you correctly, I wouldn't want the
> sample rate to stay the same, since the desired effect, by default,
> is to lower or raise pitch/speed. I'm not sure about anything beyond
> that since I don't know the technical aspect of sound. The clicking
> sound is only a minor issue for me and I've just accepted it, though
> it would probably prevent my program from being used professionally.
> 
> I suppose depending on the scaletempo setting it wouldn't click, but
> the desired effect by default is changing playback speed and pitch.
> 
> Thanks for the help.
> 
> On Sun, Jul 16, 2023 at 4:50 PM Reimar Döffinger
> <Reimar.Doeffinger at gmx.de> wrote:
> 
> >
> >  
> > > On 16 Jul 2023, at 04:34, Brad Hermanson <apeitheo at gmail.com>
> > > wrote:
> > >
> > > Over the past two years I've developed a command-line front-end
> > > to  
> > MPlayer  
> > > called Aletheia that features front-and-center pitch controls
> > > using music intervals (e.g. 1/12 of an interval for a semitone,
> > > but works with any EDO), and it utilizes speed_set to adjust.
> > > Everything works great;  
> > however,  
> > > there is a slight clicking/popping/static sound on a speed_set
> > > change.  
> >
> > speed_set reinitializes the audio filter chain to adjust to the new
> > sample rate.
> > If you give an example of the exact filter chain (or better full
> > command line)
> > and audio output you are using, there's a better chance someone can
> > take a look
> > and tell you what goes on.
> > Maybe you are doing things in a way that results in a sample rate
> > change in the audio output: then the behaviour would be
> > unsurprising. Maybe you are already using a resampler to ensure the
> > final rate stays the same,
> > in that case maybe there's just some logic missing to prevent the
> > rest of the
> > filter chain from being re-initialized etc.
> >
> > Best regards,
> > Reimar
> > _______________________________________________
> > MPlayer-users mailing list
> > MPlayer-users at mplayerhq.hu
> > https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users
> >  
> 
> On Sun, Jul 16, 2023 at 4:50 PM Reimar Döffinger
> <Reimar.Doeffinger at gmx.de> wrote:
> 
> >
> >  
> > > On 16 Jul 2023, at 04:34, Brad Hermanson <apeitheo at gmail.com>
> > > wrote:
> > >
> > > Over the past two years I've developed a command-line front-end
> > > to  
> > MPlayer  
> > > called Aletheia that features front-and-center pitch controls
> > > using music intervals (e.g. 1/12 of an interval for a semitone,
> > > but works with any EDO), and it utilizes speed_set to adjust.
> > > Everything works great;  
> > however,  
> > > there is a slight clicking/popping/static sound on a speed_set
> > > change.  
> >
> > speed_set reinitializes the audio filter chain to adjust to the new
> > sample rate.
> > If you give an example of the exact filter chain (or better full
> > command line)
> > and audio output you are using, there's a better chance someone can
> > take a look
> > and tell you what goes on.
> > Maybe you are doing things in a way that results in a sample rate
> > change in the audio output: then the behaviour would be
> > unsurprising. Maybe you are already using a resampler to ensure the
> > final rate stays the same,
> > in that case maybe there's just some logic missing to prevent the
> > rest of the
> > filter chain from being re-initialized etc.
> >
> > Best regards,
> > Reimar
> > _______________________________________________
> > MPlayer-users mailing list
> > MPlayer-users at mplayerhq.hu
> > https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users
> >  
> _______________________________________________
> MPlayer-users mailing list
> MPlayer-users at mplayerhq.hu
> https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users