[Kdenlive-devel] Questions about audio effects

Hugh Tebby hugh.tebby at gmail.com
Thu Sep 2 11:41:46 UTC 2010

I was wrong, it wasn't the 1197 plugin that was used ;)
I tested adding a new equalizer and it seems to work fine. I should send a
patch this week-end if I have an internet connection. I'll try to also add
more detailed or precise descriptions of audio effects.

By the way I had to make some code modifications in initEffects.cpp, and it
seems a bit "hackish", having to activate the effect manually in the code,
along with the parameters that were already specified in the xml file. There
are also 4 ladspa effects that aren't treated the same way (nearly but not
quite...), like the current equalizer effect for instance.

I suppose there is a reason for this (maybe something to do with jack ?),
but it looks like this bit of code could be cleaned up and automated.

2010/9/2 Hugh Tebby <hugh.tebby at gmail.com>

> Hi Dan,
> I've just moved in a new flat, and have no internet access at home for a
> few days. I'll hopefully have it back by this week-end.
> Just one thing : you said to use the mbeq 1197 ladspa plugin for the
> equalizer in order to get more frequencies, but from what I remember it's
> already that plugin that is used. I quickly tried to add new sliders in the
> xml file (and modified a related piece of code) with no success, only the
> three first sliders had an effect. I'll check again, maybe I got the plugin
> name wrong or something.
> Cheers,
> Hugh
> 2010/9/1 Dan Dennedy <dan at dennedy.org>
> On Wed, Sep 1, 2010 at 12:31 AM, Dan Dennedy <dan at dennedy.org> wrote:
>> >>>> - Gain: expecting dB instead of %, should be under "audio correction"
>> >>>> folder
>> >
>> > The underlying mlt filter does accept a dB value, but I just had to
>> > commit a change to let it accept negative values for db. However, if
>> > we change it, then existing projects will have insane dB values
>> > without doing some document conversion stuff, for which I think we are
>> > out-of-time (I do not know anything about that).
>> I was just editing normalise to use dB when I realized MLT requires
>> that you suffix the value with "dB" otherwise it is interpreted as
>> float (%), but Kdenlive effects XML system has no way to add that
>> suffix. (It has a suffix it can display as a label in UI, but that is
>> not added to the value passed to MLT.)
>> --
>> +-DRD-+
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