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  • Les formats acceptés

    28 janvier 2010, par

    Les commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
    ffmpeg -codecs ffmpeg -formats
    Les format videos acceptés en entrée
    Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
    Les formats vidéos de sortie possibles
    Dans un premier temps on (...)

  • 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 (...)

  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

Sur d’autres sites (7717)

  • Evolution #4391 (Nouveau) : Squelettes de la dist : améliorer le markup et passer à BEM

    13 octobre 2019, par tcharlss (*´_ゝ｀)

    Hello,

    En voulant créer des nouveaux thèmes pour les squelettes de la dist, j’ai rencontré des limitations dûes au markup actuel.

    Par exemple, certains éléments sans classe sont impossibles à cibler, il y a des retours lignes en dur, etc.
    En certains endroits, cela limite pas mal les possibilités.
    J’aimerais lancer un petit refactoring du markup afin qu’il soit plus facile de thémer les squelettes et de maintenir les styles.

    Il s’agirait principalement d’améliorer la nomenclature des classes, en changeant le moins possible le markup afin que les thèmes actuels restent compatibles (ou au prix d’adaptations minimes).
    On ajouterait donc des nouvelles classes, sans supprimer les classes actuelles (dans un 1er temps tout du moins ?).
    Cela pourrait être l’occasion de passer à la méthodologie BEM pour la nomenclature des classes.

    Exemple n°1

    Exemple avec le copyright et les liens dans le footer.
    Actuellement, il n’y a pas de classe autour du copyright, les liens ne sont pas encapsulés dans un conteneur, et les séparateurs « | » n’ont pas de classe n’ont plus.
    Il est donc quasiment impossible de changer l’agencement général, de changer l’apparence des séparateurs, etc.

    <span class="CodeRay"><span class="tag">span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">colophon</span><span class="delimiter">"</span></span><span class="tag">></span>
    
    2009 - 2019 Thèmes SPIP
    
    <span class="tag"><br /></span>
    
    <span class="tag">span> <span class="attribute-name">rel</span>=<span class="string"><span class="delimiter">"</span><span class="content">contents</span><span class="delimiter">"</span></span> <span class="attribute-name">href</span>=<span class="string"><span class="delimiter">"</span><span class="content">...</span><span class="delimiter">"</span></span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">first</span><span class="delimiter">"</span></span><span class="tag">></span>Plan du site<span class="tag"></span>    | <span class="tag">span> <span class="attribute-name">href</span>=<span class="string"><span class="delimiter">"</span><span class="content">ecrire/</span><span class="delimiter">"</span></span><span class="tag">></span>Espace privé<span class="tag"></span> | <span class="tag">span> <span class="attribute-name">href</span>=<span class="string"><span class="delimiter">"</span><span class="content">...</span><span class="delimiter">"</span></span> <span class="attribute-name">rel</span>=<span class="string"><span class="delimiter">"</span><span class="content">nofollow</span><span class="delimiter">"</span></span><span class="tag">></span>Se déconnecter<span class="tag"></span> | 
    
 <span class="tag">span> <span class="attribute-name">rel</span>=<span class="string"><span class="delimiter">"</span><span class="content">nofollow</span><span class="delimiter">"</span></span> <span class="attribute-name">href</span>=<span class="string"><span class="delimiter">"</span><span class="content">...</span><span class="delimiter">"</span></span><span class="tag">></span>Contact<span class="tag"></span> | <span class="tag">span> <span class="attribute-name">href</span>=<span class="string"><span class="delimiter">"</span><span class="content">...</span><span class="delimiter">"</span></span> <span class="attribute-name">rel</span>=<span class="string"><span class="delimiter">"</span><span class="content">alternate</span><span class="delimiter">"</span></span> <span class="attribute-name">title</span>=<span class="string"><span class="delimiter">"</span><span class="content">Syndiquer tout le site</span><span class="delimiter">"</span></span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">last</span><span class="delimiter">"</span></span><span class="tag">></span>RSS<span class="entity">&amp;nbsp;</span>2.0<span class="tag"></span>
    
<span class="tag"></span>
    
</span></span></span></span></span></span></span>

    Voici ce que ça pourrait donner en refactorisant :

    • Le copyright est encapsulé dans un span
    • Les liens sont considérés comme faisant partie d’un menu, et sont donc encapsulés dans un composant « menu »
    • Les séparateurs sont fait en CSS, pas en dur dans le HTML
    <span class="CodeRay"><span class="tag">span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">colophon</span><span class="delimiter">"</span></span><span class="tag">></span>
    
    <span class="tag">span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">colophon__coyright</span><span class="delimiter">"</span></span><span class="tag">></span>2009 - 2019 Thèmes SPIP<span class="tag"></span></span>
    
    <span class="tag">span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">colophon__menu</span><span class="delimiter">"</span></span><span class="tag">></span>
    
        <span class="tag">span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">menu menu_footer</span><span class="delimiter">"</span></span><span class="tag">></span>
    
            <span class="tag">span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">menu__item menu__item_plan</span><span class="delimiter">"</span></span><span class="tag">></span>
    
                <span class="tag">span> <span class="attribute-name">href</span>=<span class="string"><span class="delimiter">"</span><span class="content">...</span><span class="delimiter">"</span></span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">menu__link first</span><span class="delimiter">"</span></span> <span class="attribute-name">rel</span>=<span class="string"><span class="delimiter">"</span><span class="content">contents</span><span class="delimiter">"</span></span><span class="tag">></span>Plan du site<span class="tag"></span>
    
            <span class="tag"></span>
    
            <span class="tag">span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">menu__item menu__item_backoffice</span><span class="delimiter">"</span></span><span class="tag">></span>
    
                <span class="tag">span> <span class="attribute-name">href</span>=<span class="string"><span class="delimiter">"</span><span class="content">...</span><span class="delimiter">"</span></span><span class="tag">></span>Espace privé<span class="tag"></span>
    
            <span class="tag"></span>
    
            <span class="tag">span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">menu__item menu__item_logout</span><span class="delimiter">"</span></span><span class="tag">></span>
    
                <span class="tag">span> <span class="attribute-name">href</span>=<span class="string"><span class="delimiter">"</span><span class="content">...</span><span class="delimiter">"</span></span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">menu__link</span><span class="delimiter">"</span></span> <span class="attribute-name">rel</span>=<span class="string"><span class="delimiter">"</span><span class="content">nofollow</span><span class="delimiter">"</span></span><span class="tag">></span>Se déconnecter<span class="tag"></span>
    
            <span class="tag"></span>
    
            <span class="tag">span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">menu__item menu__item_contact</span><span class="delimiter">"</span></span><span class="tag">></span>
    
                <span class="tag">span> <span class="attribute-name">href</span>=<span class="string"><span class="delimiter">"</span><span class="content">...</span><span class="delimiter">"</span></span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">menu__link</span><span class="delimiter">"</span></span> <span class="attribute-name">rel</span>=<span class="string"><span class="delimiter">"</span><span class="content">nofollow</span><span class="delimiter">"</span></span><span class="tag">></span>Contact<span class="tag"></span>
    
            <span class="tag"></span>
    
            <span class="tag">span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">menu__item menu__item_rss</span><span class="delimiter">"</span></span><span class="tag">></span>
    
                <span class="tag">span> <span class="attribute-name">href</span>=<span class="string"><span class="delimiter">"</span><span class="content">...</span><span class="delimiter">"</span></span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">menu__link last</span><span class="delimiter">"</span></span> <span class="attribute-name">rel</span>=<span class="string"><span class="delimiter">"</span><span class="content">alternate</span><span class="delimiter">"</span></span> <span class="attribute-name">title</span>=<span class="string"><span class="delimiter">"</span><span class="content">Syndiquer tout le site</span><span class="delimiter">"</span></span><span class="tag">></span>RSS<span class="entity">&amp;nbsp;</span>2.0<span class="tag"></span>
    
            <span class="tag"></span>
    
        <span class="tag"></span>
    
    <span class="tag"></span>
    
<span class="tag"></span>
    
</span></span></span></span></span></span></span></span></span></span></span></span></span></span>

    Avec ça, on peut faire beaucoup plus de choses : afficher le copyright et le menu côte-à-côte ou l’un sous l’autre, afficher le menu à l’horizontale ou à la verticale, choisir l’apparence des séparateurs, etc.

    Exemple n°2

    Autre exemple avec les résumés d’articles.

    <span class="CodeRay"><span class="tag">span> <span class="attribute-name">dir</span>=<span class="string"><span class="delimiter">"</span><span class="content">ltr</span><span class="delimiter">"</span></span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">hentry clearfix text-left</span><span class="delimiter">"</span></span><span class="tag">></span>  
    
    <span class="tag"><strong></strong></span>
    
        <span class="tag">span> <span class="attribute-name">href</span>=<span class="string"><span class="delimiter">"</span><span class="content">...</span><span class="delimiter">"</span></span><span class="tag">></span>
    
            <span class="tag">span> <span class="attribute-name">src</span>=<span class="string"><span class="delimiter">"</span><span class="content">...</span><span class="delimiter">"</span></span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">spip_logo</span><span class="delimiter">"</span></span> <span class="attribute-name">alt</span>=<span class="string"><span class="delimiter">"</span><span class="delimiter">"</span></span> <span class="attribute-name">width</span>=<span class="string"><span class="delimiter">"</span><span class="content">150</span><span class="delimiter">"</span></span> <span class="attribute-name">height</span>=<span class="string"><span class="delimiter">"</span><span class="content">185</span><span class="delimiter">"</span></span><span class="tag">></span>
    
            Joie entourée d’angoisses (1)
    
        <span class="tag"></span>
    
    <span class="tag"></span>
    
    <span class="tag"><br /></span><span class="tag"><small></small></span>6 mai 2009, par  Victor Hugo<span class="tag"></span>
    
    <span class="tag">span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">introduction entry-content</span><span class="delimiter">"</span></span><span class="tag">></span>
    
        <span class="tag"><p></p></span>
    
            Lorem ipsum<span class="entity">&amp;nbsp;</span>(...)
    
        <span class="tag"></span>
    
    <span class="tag"></span>
    
<span class="tag"></span>
    
</span></span></span></span></span>

    En refactorisant :

    • Le composant de base est nommé « resume », et on voit qu’il s’agit d’une variante « article ».
    • Tous les éléments ont une classe.
    • Le titre est encapsulé dans un <h3></h3> plutôt qu’un <strong></strong>.
    • L’image est sortie du titre, et sa largeur n’est pas limitée à 150px (ça se ferait en CSS).
    <span class="CodeRay"><span class="tag">span> <span class="attribute-name">dir</span>=<span class="string"><span class="delimiter">"</span><span class="content">ltr</span><span class="delimiter">"</span></span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">resume resume_article hentry clearfix text-left</span><span class="delimiter">"</span></span><span class="tag">></span>  
    
    <span class="tag">span> <span class="attribute-name">src</span>=<span class="string"><span class="delimiter">"</span><span class="content">...</span><span class="delimiter">"</span></span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">resume__logo spip_logo</span><span class="delimiter">"</span></span> <span class="attribute-name">alt</span>=<span class="string"><span class="delimiter">"</span><span class="delimiter">"</span></span> <span class="attribute-name">width</span>=<span class="string"><span class="delimiter">"</span><span class="content">960</span><span class="delimiter">"</span></span> <span class="attribute-name">height</span>=<span class="string"><span class="delimiter">"</span><span class="content">480</span><span class="delimiter">"</span></span><span class="tag">></span>
    
    <span class="tag">span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">resume__title</span><span class="delimiter">"</span></span><span class="tag">></span>
    
        <span class="tag">span> <span class="attribute-name">href</span>=<span class="string"><span class="delimiter">"</span><span class="content">...</span><span class="delimiter">"</span></span><span class="tag">></span>
    
            Joie entourée d’angoisses (1)
    
        <span class="tag"></span>
    
    <span class="tag"></span>
    
    <span class="tag">span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">resume__publication</span><span class="delimiter">"</span></span><span class="tag">></span>
    
        <span class="tag">span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">resume__date</span><span class="delimiter">"</span></span><span class="tag">></span>6 mai 2009<span class="tag"></span></span><span class="tag">span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">sep</span><span class="delimiter">"</span></span><span class="tag">></span>,<span class="tag"></span></span> <span class="tag">span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">resume__author</span><span class="delimiter">"</span></span><span class="tag">></span>par Victor Hugo<span class="tag"></span></span>
    
    <span class="tag"></span>
    
    <span class="tag">span> <span class="attribute-name">class</span>=<span class="string"><span class="delimiter">"</span><span class="content">resume__content introduction entry-content</span><span class="delimiter">"</span></span><span class="tag">></span>
    
        <span class="tag"><p></p></span>
    
            Lorem ipsum<span class="entity">&amp;nbsp;</span>(...)
    
        <span class="tag"></span>
    
    <span class="tag"></span>
    
<span class="tag"></span>
    
</span></span></span></span></span></span></span>

    Voilà, ce ne sont que des exemples et non pas des propositions définitives.
    C’est juste pour montrer la direction dans laquelle aller.

    HTML5

    Il est tentant de vouloir en profiter pour passer en HTML5, mais je préfère laisser cet aspect à part (il y a déjà des tickets dessus je pense).

    Français/anglais ?

    Actuellement pour la nomenclature des classes, il y a un mélange de français et d’anglais. Personnellement, ça ne me dérange pas :)
    J’ai arrêté d’essayer de tout franciser à tout prix, je préfère partir sur une base en anglais, avec quelques éléments en français quand il n’y a a pas le choix (par exemple quand on fait référence aux objets spip : breve, rubrique, etc.).

    Cahier des charges

    • Faire en sorte que les thèmes existants restent globalement compatibles (moyennant peu d’adaptations).
    • Passer la nomenclature des classes à BEM.
    • Ajouter des classes sur tous les éléments n’en ayant pas.
    • Retirer les retours ligne en dur : <br />.
    • Travailler dans une branche nommée « bem » du dépôt git : https://git.spip.net/SPIP/dist/
    • Pas de HTML5 pour l’instant.
    • Classes en english avec des exceptions en français

  • FFmpeg Error "No such filter : 'libvmaf' Mac

    4 janvier 2021, par ringola27

    I want to use FFmpeg to calculate PSNR for video sequences.&#xA;At first I installed libvmaf with the instruction from here and here. I installed ffmpeg like here. I tried for a test :

    &#xA;&#xA;

    ffmpeg -i output4.mpg -i output1.mpg -lavfi libvmaf -f null -&#xA;

    &#xA;&#xA;

    But I get an Error (below). I think I could solve it with ./configure --enable-libvmaf --enable-version3 or ./configure --enable-libvmaf but unfortunately I can not run it (I don't know how).

    &#xA;&#xA;

    I hope anyone can help me to solve this problem.

    &#xA;&#xA;

    ffmpeg version 4.2.3 Copyright (c) 2000-2020 the FFmpeg developers&#xA;  built with Apple clang version 11.0.3 (clang-1103.0.32.59)&#xA;  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.3 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags=-fno-stack-check --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack&#xA;  libavutil      56. 31.100 / 56. 31.100&#xA;  libavcodec     58. 54.100 / 58. 54.100&#xA;  libavformat    58. 29.100 / 58. 29.100&#xA;  libavdevice    58.  8.100 / 58.  8.100&#xA;  libavfilter     7. 57.100 /  7. 57.100&#xA;  libavresample   4.  0.  0 /  4.  0.  0&#xA;  libswscale      5.  5.100 /  5.  5.100&#xA;  libswresample   3.  5.100 /  3.  5.100&#xA;  libpostproc    55.  5.100 / 55.  5.100&#xA;Input #0, mpeg, from &#x27;output4.mpg&#x27;:&#xA;  Duration: 00:00:09.88, start: 0.533367, bitrate: 363 kb/s&#xA;    Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p(tv), 352x288 [SAR 178:163 DAR 1958:1467], 104857 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 29.97 tbc&#xA;Input #1, mpeg, from &#x27;output1.mpg&#x27;:&#xA;  Duration: 00:00:10.01, start: 0.533367, bitrate: 345 kb/s&#xA;    Stream #1:0[0x1e0]: Video: mpeg1video, yuv420p(tv), 352x288 [SAR 178:163 DAR 1958:1467], 104857 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 29.97 tbc&#xA;[AVFilterGraph @ 0x7ffedbe23180] No such filter: &#x27;libvmaf&#x27;&#xA;Error initializing complex filters.&#xA;Invalid argument&#xA;

    &#xA;

  • vdpau : add av_vdpau_bind_context()

    4 octobre 2014, par Rémi Denis-Courmont
    vdpau : add av_vdpau_bind_context()

    This function provides an explicit VDPAU device and VDPAU driver to
    
libavcodec, so that the application is relieved from codec specifics
    
and VdpDevice life cycle management.
    

    A stub flags parameter is added for future extension. For instance, it
    
could be used to ignore codec level capabilities (if someone feels
    
dangerous).
    

    Signed-off-by : Anton Khirnov <anton@khirnov.net>
    • [DH] doc/APIchanges
    • [DH] libavcodec/vdpau.c
    • [DH] libavcodec/vdpau.h
    • [DH] libavcodec/vdpau_internal.h
    • [DH] libavcodec/version.h

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