[Cin] Easy Way To Visualize An Audio Track

[Andrew Randrianasulu]

В сообщении от Wednesday 20 February 2019 00:43:19 Phyllis Smith написал(а):
> Ben:
> > I'm wondering if there is an easy way I can use an effect or similar
> > function to display the waveform of an audio track in the compositor
> > output (and final render).
>
> The ffmpeg plugins that I "think" might get you what you want are all
> commented out in {your cinelerra path}/bin/ffmpeg/
> plugin.opts file.  When I uncomment these to test, they all come up with
> "Input/output error" and am assuming that this is because the required data
> is not available at the time needed.  I will have to ask GG to be sure
> though or to see if there is a workaround using a pre-Opts file, and he is
> unavailable right now.
>
> If you want to test this yourself you can do so by modifying the
> plugin.opts file in the cinelerra bin ffmpeg directory and uincommenting
> and removing the #-s at the end of the line for ahistogram...showcqt... or
> whatever.  Then delete Cinelerra_plugins in your $HOME/.bcast5 directory so
> that the plugins are reloaded.  Start Cin from a window to see the messages
> instead of an application icon.    gg/Phyllis

Aren't those plugins somewhat special? In sense they _consume_ audio data (and 
thus their input  must be attached to audio track) yet they _produce_ video 
(image) data, so their output must be connected (somehow) to video track?

>
> ------------------  Error messages I get in Cin-GG
> ----------------------------
> PluginFFilter::new_ffilter(ahistogram)
>   err: Input/output error
> PluginFFilter::new_ffilter(aphasemeter)
>   err: Operation not permitted
> PluginFFilter::new_ffilter(showcqt)
>   err: Input/output error
> PluginFFilter::new_ffilter(showfreqs)
>   err: Input/output error
> PluginFFilter::new_ffilter(showspectrum)
>   err: Input/output error
> PluginFFilter::new_ffilter(showspectrumpic)
>   err: Input/output error
> PluginFFilter::new_ffilter(showvolume)
>   err: Input/output error
> PluginFFilter::new_ffilter(showwaves)
>   err: Input/output error
> PluginFFilter::new_ffilter(showwavespic)
>   err: Input/output error