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  • Qu’est ce qu’un éditorial

    21 juin 2013, par

    Ecrivez votre de point de vue dans un article. Celui-ci sera rangé dans une rubrique prévue à cet effet.
    Un éditorial est un article de type texte uniquement. Il a pour objectif de ranger les points de vue dans une rubrique dédiée. Un seul éditorial est placé à la une en page d’accueil. Pour consulter les précédents, consultez la rubrique dédiée.
    Vous pouvez personnaliser le formulaire de création d’un éditorial.
    Formulaire de création d’un éditorial Dans le cas d’un document de type éditorial, les (...)

  • List of compatible distributions

    26 avril 2011, par

    The table below is the list of Linux distributions compatible with the automated installation script of MediaSPIP. Distribution nameVersion nameVersion number Debian Squeeze 6.x.x Debian Weezy 7.x.x Debian Jessie 8.x.x Ubuntu The Precise Pangolin 12.04 LTS Ubuntu The Trusty Tahr 14.04
    If you want to help us improve this list, you can provide us access to a machine whose distribution is not mentioned above or send the necessary fixes to add (...)

  • Les images

    15 mai 2013

Sur d’autres sites (8086)

  • How to use hardware accelearation with ffmpeg

    25 avril 2014, par ixSci

    I need to have ffmpeg decode my video(e.g. h264) using hardware acceleration. I’m using the usual way of decoding frames : read packet -> decode frame. And I’d like to have ffmpeg speed up decoding. So I’ve built it with --enable-vaapi and --enable-hwaccel=h264. But I don’t really know what should I do next. I’ve tried to use avcodec_find_decoder_by_name("h264_vaapi") but it returns nullptr.
    Anyway, I might want to use others API and not just VA API. How one is supposed to speed up ffmpeg decoding ?

    P.S. I didn’t find any examples on Internet which uses ffmpeg with hwaccel.

  • Problems getting real width and height of videos

    1er mai 2022, par Eduardo

    I'm having a problem when I upload videos. The thing is that I record my videos with my cellphone in vertical way and when I download them to my computer or pass them through whatsapp they still look vertical, I can still watch them in vertical way as I recorded them, but when I try to upload them on my website using PHP and FFMPEG I always get horizontal resolutions.

    


    I use this command to get the width of my videos :

    


    $width = $video_attributes['width'] ;

    


    The variable $video_attributes is an array that comes from a FFMPEG function that returns an array with the data related to the video.

    


    Somebody could help me out with some ideas about what I'm doing wrong ?

    


    I need to get the vertical resolution so my videos will be displayed in vertical containers in my website.

    


    Thanks in advance :)

    


  • Convert AVStream PTS value to real time in seconds

    15 janvier 2015, par Kamlesh

    The below code snippet gets the PTS value of different frames from a video file

    AVStream *stream = avctx->streams[avpkt.stream_index];
    
if ( 0 > ( err = avcodec_decode_video2 ( stream->codec, frame, &got_frame, &avpkt ) && got_frame ) )
    
{
    
    int64_t pts = av_frame_get_best_effort_timestamp ( frame );
    
    pts = av_rescale_q ( pts,  stream->time_base, AV_TIME_BASE_Q );        
    
}

    The PTS value that it returns are given below.

    • 66733
    • 100100
    • 133467

    Confusion is on the time format of the above values, whether they are in milliseconds or microseconds.
    Is there any other way to get a real time PTS values of the frames, as these will be required for subtitle rendering

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