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Autres articles (82)

  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
    Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
    Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
    Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
    All uploaded files are stored online in their original format, so you can (...)

  • MediaSPIP Player : problèmes potentiels

    22 février 2011, par

    Le lecteur ne fonctionne pas sur Internet Explorer
    Sur Internet Explorer (8 et 7 au moins), le plugin utilise le lecteur Flash flowplayer pour lire vidéos et son. Si le lecteur ne semble pas fonctionner, cela peut venir de la configuration du mod_deflate d’Apache.
    Si dans la configuration de ce module Apache vous avez une ligne qui ressemble à la suivante, essayez de la supprimer ou de la commenter pour voir si le lecteur fonctionne correctement : /** * GeSHi (C) 2004 - 2007 Nigel McNie, (...)

  • Supporting all media types

    13 avril 2011, par

    Unlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)

Sur d’autres sites (5882)

  • encode YUV420 frame to VP9

    21 novembre 2018, par User800222

    As title,

    I’m pulling frames from a IP camera. I converted the input raw data to YUV420 format, and would like to encode YUV420 to VP9, and save frames as .webm format. Would I be able to do that ? Or should I input a BGR444 format for encoding ?

    BTW, to set up the parameters for encoding vp9. Is the av_dict_set() the right function for setting parameters ?

    Ex : (http://wiki.webmproject.org/ffmpeg/vp9-encoding-guide)

    av_dict_set(&opt, "crf"    , "23", 0);
    
av_dict_set(&opt, "speed"  , "4" , 0);
    
av_dict_set(&opt, "threads", "8" , 0);
    
av_dict_set(&opt, "pass"   , "1" , 0);
    
av_dict_set(&opt, "b:v", "1400k", 0);

    Edit : The wiki uses 2 pass for setting parameters, would I be able to do in with 1 pass ?

    Edit2 : Blow code seems to be working, wonder how can I bring the size of the videos (vp9) down ? Currently, I have similar size as using h264 encoder.

        av_dict_set(&opt, "crf"    ,        "45", 0);  
    
    av_dict_set(&opt, "speed"  ,        "8" , 0); 
    
    av_dict_set(&opt, "quality",        "realtime", 0);
    
    av_dict_set(&opt, "threads",        "8" , 0);
    
    av_dict_set(&opt, "tile-columns",   "3", 0);
    
    av_dict_set(&opt, "frame-parallel", "1", 0);
    
    av_dict_set(&opt, "row-mt",         "1", 0);

    Update1 :
    YUV420P can be encoded as VP9 !

  • Create a looped video with countdown

    13 décembre 2016, par Enrico Deleo

    Something maybe challenging here :
    I want to stream (via rtmp) a video with a fixed image and a countdown applied on it. I know I can create a slideshow with even audio background with ffmtp (http://trac.ffmpeg.org/wiki/Create%20a%20video%20slideshow%20from%20images) but I’m wondering if I can loop it AND apply an overlay with the countdown to a given date.

    Any ideas ?

  • Is it possible to change volume with no reencode with ffmpeg ?

    30 juin 2023, par John Smith

    I just had this question because I used the following command with ffmpeg :

    



    ffmpeg -i input.wav -filter:a "volume=0.2" output.wav


    



    Following the documentation here : https://trac.ffmpeg.org/wiki/AudioVolume

    



    However, when I created the new file, the output was half the size of the input and the bitrate of the audio track was reduced as well.

    



    So my questions are :

    



      

    1. Is the bitrate supposed to decrease with decreasing and increasing volume like so ?

      2. 


    2. Is it possible to change volume without reencoding with ffmpeg ?

      3. 


    


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