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  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

  • Participer à sa traduction

    10 avril 2011

    Vous pouvez nous aider à améliorer les locutions utilisées dans le logiciel ou à traduire celui-ci dans n’importe qu’elle nouvelle langue permettant sa diffusion à de nouvelles communautés linguistiques.
    Pour ce faire, on utilise l’interface de traduction de SPIP où l’ensemble des modules de langue de MediaSPIP sont à disposition. ll vous suffit de vous inscrire sur la liste de discussion des traducteurs pour demander plus d’informations.
    Actuellement MediaSPIP n’est disponible qu’en français et (...)

  • 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 (...)

Sur d’autres sites (13389)

  • Generating grey nosie with FFmpeg

    5 mars, par Azat Khabibulin

    I have the following sound configuration :

    


    sub-bass:     -inf dBFS
low bass:     -inf dBFS
bass:         -inf dBFS
high bass:    -inf dBFS
low mids:     0 dBFS
mids:         0 dBFS
high mids:    -inf dBFS
low treble:   -inf dBFS
treble:       -inf dBFS
high treble:  -inf dBFS


    


    If you wonder what is it, you can listen to this sound here.

    


    I'd like to create an audio file provided this sound configuration. FFmpeg filters seem like a good fit, but are not a strict requirement. It may be any command-line tool that handles this kind of task well.

    


    The problem is that I don't really have necessary background in audio theory. I cannot choose the right FFmpeg filter (other than to make a generic white noise), I do not know how to filter frequencies in FFmpeg, I cannot even convert this particular lexicon ("bass", "mids", etc.) into specific numeric frequencies.

    


  • Multiple sounds + watermark overlay not working with ffmpeg

    9 avril 2022, par Dady

    I have a problem with an ffmpeg command.

    


    I want to add the same sound several times in the final video and then add a watermark above.

    


    When I do the full command, it doesn't work correctly because the sound is only played once (the first reference) :

    


    


    ffmpeg -i "assets/frame%05d.png" -i "assets/sound.mp3" -loop 1 -i
"assets/watermark.png" -filter_complex
"[1:a]adelay=1000|1000[s1] ;[1:a]adelay=3000|3000[s2] ;[s1][s2]amix=2[a] ;[0:v][2:v]overlay=shortest=1[outv]"
-map "[outv]" -map "[a]" -c:v libx264 -pix_fmt yuv420p -preset ultrafast -y "result.mp4"

    


    


    When I don't add the watermark, it works correctly :

    


    


    ffmpeg -i "assets/frame%05d.png" -i "assets/sound.mp3" -filter_complex
"[1:a]adelay=1000|1000[s1] ;[1:a]adelay=3000|3000[s2] ;[s1][s2]amix=2[a]"
-map 0:v -map "[a]" -c:v libx264 -pix_fmt yuv420p -preset ultrafast -y "result.mp4"

    


    


  • ffmpeg unique frames only

    5 novembre 2013, par William

    I have a video sequence (MPEG1) of 30 fps that is decoded in two ways :

    • opencv_ffmpeg returns 30 images per second, but only 5 of them are unique, while all others are clones of the unique ones.

    • proprietary players (MediaPlayer) returns only the 5 unique frames and "holds" them for (1/5) sec each.

    Is there a way to grab only the unique frames that the coder knows and not the total amount the ffmpeg decoder produces to fulfill the fps rate ?

    I'm developing a tracker and my tracker is forced to run 6 times slower and do many mistakes due to these "cloned frames".

    Does anyone know any technical term to the problem ? Unfortunately, ffmpeg is a black box for an opencv user and the documentation is sparse.

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