[FFmpeg-user] asubboost and asupercut

[Paul B Mahol]

On Fri, Nov 27, 2020 at 10:40 PM Michael Koch <astroelectronic at t-online.de>
wrote:

> Am 27.11.2020 um 20:50 schrieb Paul B Mahol:
> > On Fri, Nov 27, 2020 at 8:24 PM Michael Koch <
> astroelectronic at t-online.de>
> > wrote:
> >
> >> Am 27.11.2020 um 19:25 schrieb Paul B Mahol:
> >>> On Fri, Nov 27, 2020 at 7:09 PM Michael Koch <
> >> astroelectronic at t-online.de>
> >>> wrote:
> >>>
> >>>> Hello,
> >>>>
> >>>> I have a few questions about the asubboost and asupercut filters.
> >>>>
> >>>> -- In asubboost it's not yet clear how the block diagram of the filter
> >>>> looks like. Especially the "decay" and "feedback" options are unclear.
> >>>> What's the input of the the delay line? Before or after the low pass
> >>>> filter? Where does the feedback go to? Before or after the lowpass
> >>>> filter? I have attached a sketch of a possible block diagram, but it's
> >>>> only a wild guess.
> >>>>
> >>> This filter just adds delayed sub frequencies set by cut off frequency
> >> back
> >>> to output. Decay sets decay of old sub echo in buffer and feedback sets
> >> how
> >>> much
> >>> new sub frequencies are added to the delay buffer.
> >> Sorry, I didn't understand it. I think this filter could be explained
> >> much better with a block diagram.
> >>
> >>
> >>>> -- Is it correct that the "slope" parameter effectively changes the
> >>>> cutoff frequency, but doesn't change the steepness (dB / octave) of
> the
> >>>> filter?
> >>>>
> >>> It changes steepness, not cutoff.
> >> What's the unit of the "slope" option?
> >>
> >>
> > 1 / octave, can be set as dB unit, eg. -20dB, 0dB or 1 is max value.
> >
> > Use mentioned mpv command for the reason, as it displays curve.
>
> The command does not work on my computer. I did download mpv.exe and run
> the command line. mpv exits immediately, no output, no error message.
> When I run mpv without any options, then a mpv window opens.
>

Make sure you run it inside power shell or cmd.exe and make sure you tried
mpv.com too.


>
> Michael
>
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