libVLC and AudioBarGraph filter

[ampi]

Hi,

I'm using libVLC in a .NET application (C#) and it works like a charm!
Now I want to use the audiobargraph filter but it doesn't work.

I'm using libVLC this way :

VlcInstance class

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internal IntPtr Handle; public VlcInstance() { List<string> vlcArgs = new List<string>(); vlcArgs.Add("--audio-filter=audiobargraph_a"); vlcArgs.Add("--audiobargraph_a-bargraph=1"); vlcArgs.Add("--sub-source=audiobargraph_v"); this.Handle = LibVlc.libvlc_new(vlcArgs.Count, vlcArgs.ToArray()); if (this.Handle == IntPtr.Zero) throw new VlcException(); }

VlcMediaPlayer class

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internal IntPtr Handle; public VlcMediaPlayer(VlcInstance instance) { if (instance.Handle != IntPtr.Zero) this.Handle = LibVlc.libvlc_media_player_new(instance.Handle); if (Handle == IntPtr.Zero) throw new VlcException(); } private IntPtr _pDrawable; public IntPtr Drawable { get { return _pDrawable; } set { if (Handle != IntPtr.Zero) { LibVlc.libvlc_media_player_set_hwnd(Handle, value); _pDrawable = value; } else throw new VlcException(); } } public VlcMedia Media { get { IntPtr media = LibVlc.libvlc_media_player_get_media(Handle); if (media == IntPtr.Zero) return null; return new VlcMedia(media); } set { LibVlc.libvlc_media_player_set_media(Handle, value.Handle); } }

VlcMedia class

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internal IntPtr Handle; public VlcMedia(VlcInstance instance) { this.Handle = LibVlc.libvlc_media_new_as_node(instance.Handle, "mediaName"); if (Handle == IntPtr.Zero) throw new VlcException(); }

Application class

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using (VlcMedia media = new VlcMedia(_vlcInstance, url)) { if (_vlcPlayer == null) _vlcPlayer = new VlcMediaPlayer(media); else _vlcPlayer.Media = media; } _vlcPlayer.Drawable = PreviewPictureBox.Handle; _vlcPlayer.Play();

The audio meter is present but not showing audio levels:



I've started vlc with the same args and it works flawlessly:

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vlc "rtp://@239.239.239.239:51416" --audio-filter=audiobargraph_a --audiobargraph_a-bargraph=1 --sub-source=audiobargraph_v

Am I doing something wrong? Is it possible to use audiobargraph in libVLC? If not, anybody got a workaround to integrate audiobargraph in .NET application?

Many thanks,
ampi.

[Rémi Denis-Courmont]

1) N/A. 2) Not so far.

[Jean-Baptiste Kempf]

Did you check the log to see if both modules were loaded?

[zoidber_isid]

Hi all. I'm working too in the audiobargraph over a video using libVLC. I have the same issue than ampi (using C++ instead of C#) and I'm developing with libVLC 2.2.0. I've read a thousand threads looking for the way to show audiobar using libvlc and no one showed me the light.
Is there any improvement in libVLC that allows me to show correctly the audiobargraph?

Regards from Discworld's fan.

[Jean-Baptiste Kempf]

It's not tested, but it should not be hard to fix, tbh.

[AppStar]

Any update on this? I have a similar problem where I can't enable the AudiooBarGraph in the Windows Universal VLC app. I'm using the same parameters in the PlaybackService.Initialize method but can only see a scale without audio bars just like the original post.

Ultimately I'd like to subscribe to or monitor the audio level to perform an action when a certain level is reached. This probably needs fixed before I can even attempt that.

[Jean-Baptiste Kempf]

So far, you cannot act on audiobargraph detection.

[mklimo]

Hi,
i am wondering if this is still an issue. I am trying to add audiobargraph using libvlc but only thing i get is empty scale without audio bars. I tried multiple libvlc versions including 3.0.0 nightlies.

[Jean-Baptiste Kempf]

Hi,
i am wondering if this is still an issue. I am trying to add audiobargraph using libvlc but only thing i get is empty scale without audio bars. I tried multiple libvlc versions including 3.0.0 nightlies.

It might have not been tested enough, tbh. Does it work with VLC desktop?

[mklimo]

Yes, its working flawlessly with almost all desktop VLC versions
Sorry for late response.

[Jean-Baptiste Kempf]

Yes, its working flawlessly with almost all desktop VLC versions
Sorry for late response.

That's weird. It could be that the sub-source is not loaded, but I don't see why.

[cube45]

Hello,
This is a follow-up of the issue posted here : https://github.com/ZeBobo5/Vlc.DotNet/issues/33

I just made some tests and saw that I have a lot of

[0000028a1df1c040] main subpicture warning: original picture size is undefined

(using vlc-3.0.0) in the logs

Here is the full log : https://pastebin.com/1njhqbM0

Is there an associated trac issue already?