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  • Mise à disposition des fichiers

    14 avril 2011, par

    Par défaut, lors de son initialisation, MediaSPIP ne permet pas aux visiteurs de télécharger les fichiers qu’ils soient originaux ou le résultat de leur transformation ou encodage. Il permet uniquement de les visualiser.
    Cependant, il est possible et facile d’autoriser les visiteurs à avoir accès à ces documents et ce sous différentes formes.
    Tout cela se passe dans la page de configuration du squelette. Il vous faut aller dans l’espace d’administration du canal, et choisir dans la navigation (...)

  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

  • MediaSPIP en mode privé (Intranet)

    17 septembre 2013, par

    À partir de la version 0.3, un canal de MediaSPIP peut devenir privé, bloqué à toute personne non identifiée grâce au plugin "Intranet/extranet".
    Le plugin Intranet/extranet, lorsqu’il est activé, permet de bloquer l’accès au canal à tout visiteur non identifié, l’empêchant d’accéder au contenu en le redirigeant systématiquement vers le formulaire d’identification.
    Ce système peut être particulièrement utile pour certaines utilisations comme : Atelier de travail avec des enfants dont le contenu ne doit pas (...)

Sur d’autres sites (5220)

  • ffmpeg taking so much time to extract frames from mpeg-ts file

    19 septembre 2016, par Syed Azaruddin

    I got a problem from one mpeg-ts video. Actually it was created by some one else and even I don’t know how they are created. The problem is that, ffmpeg is taking so much time to decode all frames from the mpeg-ts video. The command I used for this operation is...

    ffmpeg -i shame-run.mov -r 24/1 test/output%d.jpg

    Actually my application is integrated with ffmpeg v2.1.1. and I had a code for detecting black frames in a mpeg-ts video. Here, my code is not able to detect all black frames from ffmpeg for this mpeg-ts video. So, I taken standalone ffmpeg of same version as mentioned above and decoded standalone. But, it is taking so much time i.e., it is taken half an hour for decoding 1 min duration video.

    So, is there any reason is that ffmpeg not able to extract as fast as required, and is there any reason that video got some errors.

  • How come the quality of HEVC with alpha from my ffmpeg with videotoolbox is not ok

    27 juin 2023, par Jos

    I'm encoding ProRes 4444 with alpha channel video's to transparent video for web in both VP9 (webm) and HEVC (mp4). I'm using a great free tool by Rotato to encode to both formats at once.

    


    However, because I would like to have more control over e.g. the dimensions and the bitrate, I'm looking into ffmpeg. I can encode to both formats with the following params.

    


    # vp9
ffmpeg -i in.mov -vf scale=-1:720 -c:v libvpx-vp9 -auto-alt-ref 0 -pix_fmt yuva420p -acodec libvorbis -cpu-used 3 -deadline good -crf 40 out.webm 

# hevc
ffmpeg -i in.mov -vf scale=-1:720 -c:v hevc_videotoolbox -allow_sw 1 -alpha_quality 0.9 -tag:v hvc1 -q:v 65 out.mp4


    


    The problem : the videotoolbox encoder generates a weird white garbage around the black pencil animations and fade-in's from transparent to black pencil become fade-in's from white pencil to black pencil !?

    


    Here are screenshots of the two compared (top one is my ffmpeg output) :

    


    hevc

    


    rotato

    


    Anyone have good settings for ffmpeg I cano use to encode good quality HEVC with alpha ?
Hardware : MacBook Air M1 and Win11 + GTX 1060 (I should be able to use NVEnc, but don't know how)

    


  • How to slide mutiple images left continuously ?

    2 mai 2024, par mikezang

    I use ffmpeg to slide images from left to center as below :

    


    #slide 1st image from right to center
#countdown 10 seconds
#slide 1st image from center to left and in the same time
#slide 2nd image from right to center
#countdown 10 seconds
#...

ffmpeg -loglevel quiet -loop 1 -i input.png -filter_complex "split=2[bg][slider];[bg]drawbox=c=black:t=fill[bg];[bg][slider]overlay=x='max(W-w*t,0)':y=0" -t 10 -y output.mp4


    


    There is black background between two images, I want to the preious page keep slide from center to left and next page slide fron right to center, what can I do ?
enter image description here

    


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