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  • La file d’attente de SPIPmotion

    28 novembre 2010, par

    Une file d’attente stockée dans la base de donnée
    Lors de son installation, SPIPmotion crée une nouvelle table dans la base de donnée intitulée spip_spipmotion_attentes.
    Cette nouvelle table est constituée des champs suivants : id_spipmotion_attente, l’identifiant numérique unique de la tâche à traiter ; id_document, l’identifiant numérique du document original à encoder ; id_objet l’identifiant unique de l’objet auquel le document encodé devra être attaché automatiquement ; objet, le type d’objet auquel (...)

  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

  • Support audio et vidéo HTML5

    10 avril 2011

    MediaSPIP utilise les balises HTML5 video et audio pour la lecture de documents multimedia en profitant des dernières innovations du W3C supportées par les navigateurs modernes.
    Pour les navigateurs plus anciens, le lecteur flash Flowplayer est utilisé.
    Le lecteur HTML5 utilisé a été spécifiquement créé pour MediaSPIP : il est complètement modifiable graphiquement pour correspondre à un thème choisi.
    Ces technologies permettent de distribuer vidéo et son à la fois sur des ordinateurs conventionnels (...)

Sur d’autres sites (2660)

  • Compressing videos from a smartphone

    21 septembre 2019, par fejesjoco

    I have a Nexus 6p with the stock camera. It’s set to record at 1080p, 30fps. Here’s a 5 second sample (11 MB).

    Videos from this phone come out at about 17 Mbps on average. I tried to compress it with ffmpeg with -c:v libx264 -crf 23 -preset veryslow, the result comes out at about 5.5 MB, which is about 9 Mbps.

    I think this bitrate is a bit too much. When I look at torrent file listings, I can see high quality videos at 3 GB in size on average, and if such a movie is 90 minutes long on average, that is about 4-5 Mbps which sounds okay.

    I’m wondering, why the big difference ? I can notice that my video is noisy/grainy (which is expected from a phone), and that might reduce compressibility. I tried a few ffmpeg filters, like hqdn3d and atadenoise, but the noise mostly remained (maybe I didn’t play with it enough). Then I figured, the video is also shaky (which is also expected), and that might reduce compressibility too (and even makes temporal noise filtering less effective). I tried to stabilize it with the deshake filter, but that didn’t help either.

    I know I could just limit the bandwidth to whatever I like, but there must be a reason why ffmpeg thinks it needs a high bandwidth to maintain a certain quality, and a lower bandwidth would just decrease the quality.

    Why do these videos have such a high bitrate ? What’s the best way to compress them more while keeping or even increasing their quality ?

  • ffmpeg convert from WMV to AVC1 instead of "official" H264 [on hold]

    26 mars 2014, par thipeto

    I searched google for an answer, but I can't find the solution. It's for professional use.

    I'm trying to convert some wmv files (WMV3) to MP4 (H.264). It should take the format h.264, and instead of it, it's taken the H.264 (AVC1) format.

    It seems like the AVC is a format used in Apple, and I don't want to convert to this format, only to h264 "official", the one who fourcc shows me.
    I'm using the last version of ffmpeg, following is the basic command that I'm using :

    ffmpeg -i input.wmv -c:v libx264 -q:v 0 output.mp4

    I'm trying to understand the reason that some PCs here convert to h264, and other to AVC1.
    Someone can help me ? What should I do to make the other PCs convert to the real h.264 without install a pack of codecs ? I just want to convert to mp4, there's a way to install only codecs to convert to mp4 ?

    Many thanks,
    Thiago.

  • ffmpeg convert from WMV to AVC1 instead of "official" H264 [closed]

    26 mars 2014, par thipeto

    I searched google for an answer, but I can’t find the solution. It’s for professional use.

    I’m trying to convert some wmv files (WMV3) to MP4 (H.264). It should take the format h.264, and instead of it, it’s taken the H.264 (AVC1) format.

    It seems like the AVC is a format used in Apple, and I don’t want to convert to this format, only to h264 "official", the one who fourcc shows me.
    I’m using the last version of ffmpeg, following is the basic command that I’m using :

    ffmpeg -i input.wmv -c:v libx264 -q:v 0 output.mp4

    I’m trying to understand the reason that some PCs here convert to h264, and other to AVC1.
    Someone can help me ? What should I do to make the other PCs convert to the real h.264 without install a pack of codecs ? I just want to convert to mp4, there’s a way to install only codecs to convert to mp4 ?

    Many thanks,
    Thiago.

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