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Autres articles (72)

  • 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 (...)

  • Les vidéos

    21 avril 2011, par

    Comme les documents de type "audio", Mediaspip affiche dans la mesure du possible les vidéos grâce à la balise html5 .
    Un des inconvénients de cette balise est qu’elle n’est pas reconnue correctement par certains navigateurs (Internet Explorer pour ne pas le nommer) et que chaque navigateur ne gère en natif que certains formats de vidéos.
    Son avantage principal quant à lui est de bénéficier de la prise en charge native de vidéos dans les navigateur et donc de se passer de l’utilisation de Flash et (...)

  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

Sur d’autres sites (8954)

  • FFMPEG - Adding a full-frame image to the beginning of a video

    28 mars 2014, par user3470655

    I have tried many different ways to try to create a 10 second video file out of an image file and have used all the same switches and codecs as I used to encode my video file. However, when I concat the two using anything but complex_filter (which forces the video through another round of transcoding), the resulting video file is corrupt. I believe this is due to the inherent differences of the 10 second clip that ffmpeg created from the image, but there must be some way to get it to encode the exact same way as my video file.

    Here is the command I am using to turn the image into a 10s video clip (I added a silent mp3 because I thought that an audio stream starting partway through the video was messing things up) :

    ffmpeg -loop 1 -i splash.jpg -i silence.mp3 -c:v libx264 -preset slow -g 60 -r 29.97 -crf 16 -c:a libfdk_aac -b:a 256k -cutoff 18000 -t 5 tmpoutput1.mp4

    Here is the command I am using to encode my video :

    ffmpeg -i input.f4v -c:v libx264 -preset slow -g 60 -r 29.97 -crf 16 -c:a libfdk_aac -b:a 256k -cutoff 18000 tmpoutput2.mp4

    Here is the command I use to convert both of them to .ts to get ready for concat :

    ffmpeg -i tmpoutput1.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts tmpoutput1.ts

    And finally the concat (which is where I get crazy video corruption, everything along the way looks fine) :

    ffmpeg -i "concat:tmpoutput1.ts|tmpoutput2.ts" -c copy output.mp4

    Again, the issue is that I'm already transcoding everything once and I should be able to get it to transcode in a similar enough structure so that it can be concatenated without another transcode tacked onto the end.

    Has anyone successfully added a full-frame splash graphic to the front of a video with ffmpeg before ? I am using a brand new cross-compile of ffmpeg as I thought that might be the issue, but alas, the issue persists after the update.

    Thanks !

  • lavc/mmaldec : reduce some diffs with Libav missed in previous skipped merges

    21 juin 2016, par Clément Bœsch
    lavc/mmaldec : reduce some diffs with Libav missed in previous skipped merges
    • [DH] libavcodec/mmaldec.c

  • Crop and reduce frame rate without loosing quality in ffmpeg

    27 juin 2016, par user413734

    I would like to take my input file (ProRes highest quality 60 fps) and crop it and convert the frame rate to 15 fps. The following did not work (the cropping alone did work, but the frame rate reduction not) :

    ffmpeg -i input.mov -vf "crop=1280:1024:320:28" -strict -2 -vcodec prores -profile:v 3 - r 15 -y output.mov

    I also do not know how ffmpeg exactly converts the frame rates. But what I would like to achieve is that it crops the video and then just takes every 4th frame (60/15) and keep the remaining frames on the same quality (copy the original codec).

    Any ideas would be great.

    Thanks.

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