[Kdenlive-devel] Questions about audio effects

[Till Theato]

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On 05/30/2010 06:18 PM, Hugh Tebby wrote:
> Hi everyone,
> 
> I thought would look into the effects list in order to give more detailed
> information about the effects and maybe reorganize things a little, see what
> effects work, which ones don't etc.
> 
> I went through all the SOX and LADSPA audio effects, and here are a few
> conclusions :
> - Many effects have either no effect or clearly don't work correctly
> - There are duplicates betwwen SOX, LADSPA and 'native' effects
> 
> So here are a few questions :
> - If we remove the duplicate effects, which should be kept ? LADSPA or SOX ?
> - Should all effects that don't seem to work correctly be disabled ? Should
> the xml file actually be removed or put into a "not_working" folder ?
> 
> Also, I can't quite understand how the Kdenlive interface connect to the
> effects. For the LADSPA, for instance, the Equalizer effect has three inputs
> (logain, midgain and higain), but the actual LADSPA effect (mbeq_1197) has
> 15 possible frequencies, and running 'analyseplugin mbeq_1197' gives me :
> 
> Plugin Name: "Multiband EQ"
> Plugin Label: "mbeq"
> Plugin Unique ID: 1197
> Maker: "Steve Harris <steve at plugin.org.uk>"
> Copyright: "GPL"
> Must Run Real-Time: No
> Has activate() Function: Yes
> Has deativate() Function: No
> Has run_adding() Function: Yes
> Environment: Normal or Hard Real-Time
> Ports:  "50Hz gain (low shelving)" input, control, -70 to 30, default 0
>         "100Hz gain" input, control, -70 to 30, default 0
>         "156Hz gain" input, control, -70 to 30, default 0
>         "220Hz gain" input, control, -70 to 30, default 0
>         "311Hz gain" input, control, -70 to 30, default 0
>         "440Hz gain" input, control, -70 to 30, default 0
>         "622Hz gain" input, control, -70 to 30, default 0
>         "880Hz gain" input, control, -70 to 30, default 0
>         "1250Hz gain" input, control, -70 to 30, default 0
>         "1750Hz gain" input, control, -70 to 30, default 0
>         "2500Hz gain" input, control, -70 to 30, default 0
>         "3500Hz gain" input, control, -70 to 30, default 0
>         "5000Hz gain" input, control, -70 to 30, default 0
>         "10000Hz gain" input, control, -70 to 30, default 0
>         "20000Hz gain" input, control, -70 to 30, default 0
>         "Input" input, audio
>         "Output" output, audio
>         "latency" output, control
> 
> So I suppose the "logain", "midgain" and "higain" must be specified
> somewhere, but i can find no documentation about it.
> 

The LADSPA effects are hardcoded into Kdenlive.
Take a look at initeffects.cpp

regards ttill
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