The VideoLAN Forums

Posted: **27 Apr 2022 18:47**

We're developing a Karaoke software here and we are using VLC lib to play videos. well, the last part of software is change the Pitch of video, i'm tried it:

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	 viewpoint = vlcPlayer.mediaPlayer().video().newViewpoint();
         viewpoint.setPitch(2);
         viewpoint.setYaw(0);
         viewpoint.setRoll(0);
         viewpoint.setFov(80.0f);
         vlcPlayer.mediaPlayer().video().updateViewpoint(viewpoint, true);

but don't be effect, i was see at windows vlc player that we need enable pitch adjust to do it, but how can i change it ?
i'm using 4.7.1 lib version.
help me please. thank's.

Posted: **27 Apr 2022 18:51**

There is no library version 4.7.1. The latest release as of today is 3.0.17.4.

Posted: **27 Apr 2022 19:04**

i'm using java, follow the two last logs release.
18th March, 2022 - vlcj 4.7.2 released, minor bugfix release relating to embedded media list player component
4th April, 2021 - vlcj 4.7.1 released, some trivial low-impact changes

and follow the dependency from java

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<dependency>
    <groupId>uk.co.caprica</groupId>
    <artifactId>vlcj</artifactId>
    <version>4.7.1</version>
</dependency>

The software is almost ready, just have this requirement to finish.

Posted: **28 Apr 2022 04:46**

Try this code https://github.com/caprica/vlcj-example ... tTest.java, then you'll be able to find out what's incorrect with yours.

Posted: **29 Apr 2022 02:58**

hello, thanks for your awser, i was already see this code and i cut this part:

Code: Select all

viewpoint = vlcPlayer.mediaPlayer().video().newViewpoint();
         viewpoint.setPitch(2);
         viewpoint.setYaw(0);
         viewpoint.setRoll(0);
         viewpoint.setFov(80.0f);
         vlcPlayer.mediaPlayer().video().updateViewpoint(viewpoint, true);

but don't be effect, maybe being missing something. what do you think ?

Posted: **29 Apr 2022 09:32**

Hi, is it a 360 karaoke player or do you want to change the pitch of audio instead ?

360 will only work with media that have the correct metadata tagging.

Posted: **29 Apr 2022 16:09**

Hi friend, it's not a 360 Karaoke, i'm just need to change the audio pitch from the normal media.
Look, we have in english a lot synonym word, i'm searching synonym right now from pitch and i have "tone" "hue" "pitch" etc... i'm looking into the class this words to finally found how change the TONE/PITCH of AUDIO. (i know that is not hue) let get next word.

this code bellow show the ModuleDescription of scaletempo_pitch Audio pitch changer Pitch Shifter, now i'm looking how to use Audio Filters.

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	List<ModuleDescription> audioFilters = vlcPlayer.mediaPlayerFactory().application().audioFilters();
                   
         for(int i = 0; i < audioFilters.size(); i ++ ) {
              dump(i, audioFilters.get(i));
          }
          
        private static void dump(int i, ModuleDescription moduleDescription) {
        	System.out.printf(FORMAT_PATTERN, String.valueOf(i + 1), moduleDescription.name(), moduleDescription.shortName(), moduleDescription.longName(), formatHelp(moduleDescription.help()));
        }
         
        private static String formatHelp(String help) {
        	return help != null ? help.replaceAll("\\n", " ") : "";
        }

i think i need somethink like a Audio Filter to change the pitch, someone know audio filter ?

Thank's.

Posted: **06 May 2022 15:23**

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         viewpoint.setPitch(2);

Then this is completely unrelated indeed, this will change the 360 video viewpoint (or audio spatialization viewpoint) so it doesn't change the pitch of the audio at all.

scaletempo_pitch is the correct way to go, but there's no supported public API right now, and the option is not supported at the libvlc instance nor libvlc media level. In short, you're out of luck with libvlc for now. :/

Posted: **12 May 2022 23:36**

Hello, ok i'm understood, meantime i keep searching and i found the FilterTest class that show all filters is enable to use as follow the code:

Code: Select all

public class FilterTest {

    private static final String FORMAT_PATTERN = "%3s %-24s %-24s %-80s %s\n";

    public static void main(String[] args) throws Exception {
        MediaPlayerFactory factory = new MediaPlayerFactory();

        List<ModuleDescription> audioFilters = factory.application().audioFilters();
        List<ModuleDescription> videoFilters = factory.application().videoFilters();

        System.out.println("Audio Filters:");
        System.out.println();

        System.out.printf(FORMAT_PATTERN, "#", "Name", "Short Name", "Long Name", "Help");
        System.out.printf(FORMAT_PATTERN, "=", "====", "==========", "=========", "====");
        for(int i = 0; i < audioFilters.size(); i ++ ) {
            dump(i, audioFilters.get(i));
        }

        System.out.println();

        System.out.println("Video Filters:");
        System.out.println();

        System.out.printf(FORMAT_PATTERN, "#", "Name", "Short Name", "Long Name", "Help");
        System.out.printf(FORMAT_PATTERN, "=", "====", "==========", "=========", "====");
        for(int i = 0; i < videoFilters.size(); i ++ ) {
            dump(i, videoFilters.get(i));
        }
    }

    private static void dump(int i, ModuleDescription moduleDescription) {
        System.out.printf(FORMAT_PATTERN, String.valueOf(i + 1), moduleDescription.name(), moduleDescription.shortName(), moduleDescription.longName(), formatHelp(moduleDescription.help()));
    }

    private static String formatHelp(String help) {
        return help != null ? help.replaceAll("\\n", " ") : "";
    }
}

when we run this class we got this return:

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Audio Filters:

  # Name                     Short Name               Long Name                                                                        Help
  = ====                     ==========               =========                                                                        ====
  1 stereo_widen             Stereo Enhancer          Simple stereo widening effect                                                    This filter enhances the stereo effect by suppressing mono (signal common to both channels) and by delaying the signal of left into right and vice versa, thereby widening the stereo effect.
  2 spatializer              Spatializer              Audio Spatializer                                                                
  3 spatialaudio             Binauralizer             Ambisonics renderer and binauralizer                                             
  4 scaletempo               Scaletempo               Audio tempo scaler synched with rate                                             
  5 scaletempo_pitch         Audio pitch changer      Pitch Shifter

The audio filter number #5 is scaletempo_pitch Audio pitch changer Pitch Shifter, someone know how can i apply this AudioFilter at Audio ? Thank very much.

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