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  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
    You may also (...)

  • Contribute to a better visual interface

    13 avril 2011

    MediaSPIP is based on a system of themes and templates. Templates define the placement of information on the page, and can be adapted to a wide range of uses. Themes define the overall graphic appearance of the site.
    Anyone can submit a new graphic theme or template and make it available to the MediaSPIP community.

  • Ajouter notes et légendes aux images

    7 février 2011, par

    Pour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
    Une fois le plugin activé, vous pouvez le configurer dans l’espace de configuration afin de modifier les droits de création / modification et de suppression des notes. Par défaut seuls les administrateurs du site peuvent ajouter des notes aux images.
    Modification lors de l’ajout d’un média
    Lors de l’ajout d’un média de type "image" un nouveau bouton apparait au dessus de la prévisualisation (...)

Sur d’autres sites (6895)

  • Adjust volume of both input mp3 files while merging using ffmpeg

    18 septembre 2016, par Ali Akram

    I am using the following command to merge two audio files (mp3) into one output.mp3

    -i /sdcard/NNR/input1.mp3 -i /sdcard/NNR/input2.mp3 
    
    -filter_complex amerge -ac 2 -c:a libmp3lame 
    
    -q:a 4 /sdcard/NNR/output.mp3

    Kindly suggest me how to adjust volume level of both input files to some specific level.

    I have found the following filter variable but don’t exactly know how to adjust into my command.

    ffmpeg -i a.mp3 -i b.mp3 
    
   -filter_complex "[0:a]volume=.25[A];[1:a][A]amerge[out]" 
    
   -map [out] -c:a pcm_s16le out.wav

    Any help will be much appreciated.Thanks

  • ffmpeg how to shorten volume range

    10 juillet 2021, par 敬錞 潘

    I use this command below to get volume information

    


    ffmpeg -i {fileName} -af  "volumedetect" -f null -


    


    and get result below :

    


    [Parsed_volumedetect_0 @ 000001b4f9675ec0] mean_volume: -25.1 dB
[Parsed_volumedetect_0 @ 000001b4f9675ec0] max_volume: -4.0 dB
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_4db: 12
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_5db: 72
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_6db: 293
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_7db: 808
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_8db: 2276
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_9db: 5885
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_10db: 13146
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_11db: 26627


    


    I want to shorten volume range to half range like this below

    


    [Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_6db: ...
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_7db: ...
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_8db: ...
[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_9db: ...


    


    How to do it by ffmpeg command ?

    


    Update1 :

    


    filename.mp3 volume detect is below :

    


    [Parsed_volumedetect_0 @ 00000192cd9adcc0] max_volume: -0.3 dB
[Parsed_volumedetect_0 @ 00000192cd9adcc0] histogram_0db: 32
[Parsed_volumedetect_0 @ 00000192cd9adcc0] histogram_1db: 333
[Parsed_volumedetect_0 @ 00000192cd9adcc0] histogram_2db: 1216
[Parsed_volumedetect_0 @ 00000192cd9adcc0] histogram_3db: 3490
[Parsed_volumedetect_0 @ 00000192cd9adcc0] histogram_4db: 8829
[Parsed_volumedetect_0 @ 00000192cd9adcc0] histogram_5db: 19873


    


    after execute command

    


    ffmpeg -i filename.mp3 -af filename_output.mp3


    


    filename_output.mp3 volume detect is below :

    


    [Parsed_volumedetect_0 @ 0000017af506dd00] max_volume: -0.4 dB
[Parsed_volumedetect_0 @ 0000017af506dd00] histogram_0db: 13
[Parsed_volumedetect_0 @ 0000017af506dd00] histogram_1db: 226
[Parsed_volumedetect_0 @ 0000017af506dd00] histogram_2db: 906
[Parsed_volumedetect_0 @ 0000017af506dd00] histogram_3db: 2688
[Parsed_volumedetect_0 @ 0000017af506dd00] histogram_4db: 7202
[Parsed_volumedetect_0 @ 0000017af506dd00] histogram_5db: 16473


    


    There is no big changes, if I want to shorten more volume range , how to do ?

    


  • How to extract video's file loudness (or volume) information using FFMPEG ?

    31 juillet 2013, par Oberdan Nunes

    We need to extract the loudness information for every second from a video file in order to produce a graphical representation of loudness changes during the video progress.
    I'm trying to use FFMPEG with audio filter but I get stucked in how to extract the loudness information for every second (or frame) and then export this information to some report file.

    I've read something about volume detection, but anything about loudness. But if at least I could do the same with volume detection, it would be a good begining.

    Thanks in advance.

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