Re: [Audacity-devel] Dynamic Compressor Effect

[James C. <jam...@gm...>]

Hi Max.

The previous update I had on this was about the long latency.
Disabling realtime preview is sort of OK, but something seems wrong.
A one minute latency is colossal.  That points to something underlying
wrong.

Also 3.0.1 has now become very very much a maintenance release for
addressing the 3.0.0 unitary project issues.  Paul would love to get some
structural
changes in that improve independence between pieces of code, and I am
saying no.
We'd also like to get portaudio and FFmpeg library updates in, and I am
saying no.

It is pretty clear that the release after 3.0.1 is going to be quite soon,
so as RM
I'm sorry to have to say that your compressor will have to sit out for
3.0.1.

3.0.1 is due to actually release on 17th April, so it's a further delay of
about 3
weeks for you in seeing progress on your compressor getting in to Audacity.

Is there a good reason for the very long latency?

--James.




On Sat, 27 Mar 2021 at 07:56, Max Maisel <mm...@po...> wrote:

> Hi all,
>
> I've polished my Dynamic Compressor effect and think it is ready now
> for inclusion.
>
> Since my last mail (see
> https://sourceforge.net/p/audacity/mailman/message/37109016/ for the
> initial message), I mainly reworked the user interface accoring to your
> feedback and fixed several bugs.
>
> The effect is basically realtime capable but for now realtime preview
> is disabled after some discussion with Steve because there are
> currently some limitations in the RealtimeEffectManager which cause
> bad user experience due to high processing latency in the effect at
> some settings.
>
> Main probleme here is, that the RealtimeEffectManager gives the effect
> a small block, e.g. 256 samples, and expects the same amount of samples
> in return. So if an effect like my compressor has a high processing
> latency, there can be an initial silence for over one minute which the
> users will think is a bug. Any changes made to the effect settings will
> only take effect after this long time as well.
>
> A possible solution would be latency compensation in the
> RealtimeEffectManager so that the effect can request the required
> amount of samples in advance at the beginning or when the user changes
> settings. The silence at the beginning can then be discarded so that
> users do not notice it. But this is out of scope of the compressor
> effect changes.
>
> The lastest revision including CI builds can be found in my pull
> request at https://github.com/audacity/audacity/pull/676.
>
> The latest documentation for the effect is can be found at
> https://alphamanual.audacityteam.org/man/Dynamic_Compressor.
>
> I'm looking forward to further feedback and integration.
>
> Max
>
>
>
>
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