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Autres articles (109)

  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

  • Le profil des utilisateurs

    12 avril 2011, par

    Chaque utilisateur dispose d’une page de profil lui permettant de modifier ses informations personnelle. Dans le menu de haut de page par défaut, un élément de menu est automatiquement créé à l’initialisation de MediaSPIP, visible uniquement si le visiteur est identifié sur le site.
    L’utilisateur a accès à la modification de profil depuis sa page auteur, un lien dans la navigation "Modifier votre profil" est (...)

  • Les sons

    15 mai 2013, par

Sur d’autres sites (12033)

  • Create VHS Hi-Fi type (20Hz-20kHz) WAV file, from a 48kHz source FFmpeg [closed]

    27 août 2023, par Taymur Roshan

    I've been experimenting with using FFmpeg to convert modern high-quality audio (44.1, 48 & 96kHz etc.)into analogue type audio which are the old fashions Hi-Fi sounds like the 20 kHz frequency sampling signals https://en.wikipedia.org/wiki/VHS#Hi-Fi_audio_system.

    


    But since I already figured out of how to simply convert high frequency (source 48kHz) to low frequently (output 20kHz) using the '-ar' filter :

    


    ffmpeg -i "source.webm" -c:a pcm_s16le -ar 20000 "output.wav"


    


    However what I would like to know is that how can I make a genuine "flat full-range frequency response" 20 Hz to 20 kHz ?

    


    That would mean first downmix to 20kHz and also remove the first 20Hz out of the audio.

    


  • Evolution #3962 : Générer des JPEG progressifs

    18 juin 2017, par Michel Bystranowski

    Mmm, ça a l’air un peu plus compliqué qu’au premier abord effectivement. J’ai trouvé cet article qui compare le taux de compression et recommande de ne le faire que pour les fichiers de plus de 10k, sous peine d’obtenir des fichiers plus gros (https://yuiblog.com/blog/2008/12/05/imageopt-4/). Du coup il faudrait s’arranger pour ne cibler que les gros JPEGs.

    Par côté compatibilité des navigateurs ça semble ok pour tous les navigateurs récents (https://en.wikipedia.org/wiki/Comparison_of_layout_engines_%28graphics%29#JPEG_support).

  • Stream and control a playlist to RTMP

    20 décembre 2016, par Eight

    I’m currently trying to stream a playlist of files from ffmpeg to an RTMP server.
    I’ve managed to get a single file to be streamed correctly, and (I think) a playlist by using :

    "concat:file1.pm4|file2.mp4|file3.mp4"

    I then tried to use the concatenation method from a txt file they explain here :
    https://trac.ffmpeg.org/wiki/Concatenate

    And was able to get it to work. However I seem to have some problems with controlling it. For example, I have no idea if it is possible to tell ffmpeg to skip this file and play the next one in the list, or to pause the stream at all. I already tested editing the txt file while it is streaming, but that didn’t seem to affect what was already streaming at all.

    Any idea how I can control my stream from the console ? My end goal would be to make the control into a full web interface later, but I’m not even sure if ffmpeg is my best option to do this.

    Any help with ffmpeg or any other options to do this would be greatly appreciated.

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