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Posted: **13 Feb 2017 09:47**

Hello！
I am trying to set gain value by the "libvlc_media_add_option" api, unfortunately there is no effect.
But the comand line works, "cvlc --audio-filter=gain file:///media/psf/Home/Documents/personal/music/thingsyoudtknow.mp3 --gain=0"
Did I miss something?

Code: Select all

    inst = libvlc_new(0, NULL);                                            
    m = libvlc_media_new_location (inst, "file:///media/psf/Home/Documents/personal/music/test/thingsyoudontknow.mp3");
    libvlc_media_add_option(m, "audio-filter=gain");
    libvlc_media_add_option(m, "gain=0");

    mp = libvlc_media_player_new_from_media(m);
    libvlc_media_player_play(mp);

besides, my vlc version is "VLC media player 2.1.6 Rincewind".
Thanks in advance.

Posted: **14 Feb 2017 16:24**

According to this link: http://www.videolan.org/developers/vlc/ ... defcad3e6f

..."We recommend using libvlc_media_new_path() instead when dealing with local files."

I don't know if that will make any difference for your problem, of course.

Posted: **14 Feb 2017 16:29**

...also...

I couldn't find the details for "audio-filter=gain". Are you sure this is a media option and not an instance option?

Posted: **15 Feb 2017 04:25**

According to this link: http://www.videolan.org/developers/vlc/ ... defcad3e6f

..."We recommend using libvlc_media_new_path() instead when dealing with local files."

I don't know if that will make any difference for your problem, of course.

Thanks for your reply

. I tried libvlc_media_new_path with absolute path, there is no difference.

Posted: **15 Feb 2017 04:37**

...also...

I couldn't find the details for "audio-filter=gain". Are you sure this is a media option and not an instance option?

I'm not sure

I find this option from the audio section in "vlc -H".
Hi, brother, my goal is making music sound the same loudness. Firstly I got the music file's loudness level by mp3gain.
But I can't modify the music file, so I need to tell vlc how much gain should be applied when playing the music file.
Could you give me some clue about which API can achieve this?
thanks.

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setting gain value has no effect

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