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  • 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 (...)

  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

  • Amélioration de la version de base

    13 septembre 2013

    Jolie sélection multiple
    Le plugin Chosen permet d’améliorer l’ergonomie des champs de sélection multiple. Voir les deux images suivantes pour comparer.
    Il suffit pour cela d’activer le plugin Chosen (Configuration générale du site > Gestion des plugins), puis de configurer le plugin (Les squelettes > Chosen) en activant l’utilisation de Chosen dans le site public et en spécifiant les éléments de formulaires à améliorer, par exemple select[multiple] pour les listes à sélection multiple (...)

Sur d’autres sites (9336)

  • FFMPEG command runs forever even on using timelimit

    21 décembre 2017, par t6nand

    Mostly I use a java code to run FFMPEG bash commands for watermarking a logo on video. I am using the following FFmpeg command to overlay an image on video. I have observed that at times for some random videos, the process keeps on running even after the timelimit assigned to it expires. At times it’s more than a day or couple of days until not directly killed using kill -9 pid :

    ffmpeg -timelimit 900 -y -i
    input_video
    -i logoImage -filter_complex "[0:v]scale=trunc(iw/2)*2:trunc(ih/2)*2[even] ;[1:v][even]scale2ref=iw*0.25 :(iw*0.25)*(0.46446702)[2nd][ref] ;[ref][2nd]overlay=(main_w-overlay_w) :(main_h-overlay_h)"
    -c:v libx264 -b:v 300K -crf 28 -preset slow outputVideo

    But this command never completes even on using -timelimit flag at times for some videos.

    I have observed that for such processes output from ps aux|grep ffmpeg yeilds in something like :

    ubuntu 16620 0.6 6.7 1595044 515392 ? Sl Dec20 12:05
    ffmpeg -timelimit 900 -y -i
    input_video
    -i logoImage -filter_complex "[0:v]scale=trunc(iw/2)*2:trunc(ih/2)*2[even] ;[1:v][even]scale2ref=iw*0.25 :(iw*0.25)*(0.46446702)[2nd][ref] ;[ref][2nd]overlay=(main_w-overlay_w) :(main_h-overlay_h)"
    -c:v libx264 -b:v 300K -crf 28 -preset slow outputVideo

    It indicates that this process is in interruptible sleep state i.e. waiting for an event to complete. On using sudo strace -p 16620 to trace which system call is this process hung up on it results in something like :

    Process 16620 attached write(2, "frame= 4121 fps= 10 q=33.0 size="...,
    99

    i.e. it’s stuck writing to a file.

    What could be the reason for this problem ?
    And is there any other way to kill FFMPEG process which overshoots desired time limit ?

  • How do I connect two GIFs to play one after another in Python ?

    9 novembre 2022, par Andrew

    If I have two GIFs, GIF 1 being 10 seconds long and GIF 2 being 5 seconds long, is there a way to connect them so the final GIF is a total of 15 seconds long ?

    


    Would I have to loop through each frame of both the GIFs with imageio.mimread() and output, once all the frames are read in memory ?

    


    Or is there another way by knowing the start and end times and shifting it ?

    


    Edit :
The solution presented by FirefoxMetzger is extremely Pythonic, ideal if you do not wish to install other software / packages like gifsicle.

    


    import imageio.v3 as iio
import numpy as np

frames = np.vstack([
    iio.imread("imageio1.gif"),
    iio.imread("imageio2.gif"),
])

# get duration each frame is displayed
iio.imwrite("imageio_combined.gif", frames)


    


    This completes in 15.6 seconds for two GIFs, each containing 100 frames.

    


    However, if runtime is important, I recommend gifsicle :

    


    gifsicle(
    sources=["imageio1.gif", "imageio2.gif"], # or just omit it and will use the first source provided.
    destination="imageio3.gif",
    options=["--optimize=2", "--threads=2", "--no-conserve-memory"]
)


    


    This completes in 4.8 seconds, which is three times as fast.

    


  • How to generate only 10 thumbnails irrespective of video duration with ffmpeg

    15 août 2022, par EaBengaluru

    Hi i want to generate only 10 thumbnails irrespective of video duration with ffmpeg

    


    I have followed this thread Create multiple thumbnails from a video at equal times / intervals

    


    here is the command i'm using

    


    ffmpeg -i input.mp4 -vf "select='not(mod(t,60/12))'" -vsync vfr output_%04d.jpg


    


    for 14.4 duration video it is generating only 3 thumbnails , i want always 10 with equal interval.

    


    For example if i have 120 duration video i must get thumbnails at

    


    [0 or 12, 24,36,48,60,72,84,96,108,120]


    


    Question : i want to generate always 10 thumbnails with equal interval as shown in example for duration of 120

    


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