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  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
    You may also (...)

  • Script d’installation automatique de MediaSPIP

    25 avril 2011, par

    Afin de palier aux difficultés d’installation dues principalement aux dépendances logicielles coté serveur, un script d’installation "tout en un" en bash a été créé afin de faciliter cette étape sur un serveur doté d’une distribution Linux compatible.
    Vous devez bénéficier d’un accès SSH à votre serveur et d’un compte "root" afin de l’utiliser, ce qui permettra d’installer les dépendances. Contactez votre hébergeur si vous ne disposez pas de cela.
    La documentation de l’utilisation du script d’installation (...)

  • Automated installation script of MediaSPIP

    25 avril 2011, par

    To overcome the difficulties mainly due to the installation of server side software dependencies, an "all-in-one" installation script written in bash was created to facilitate this step on a server with a compatible Linux distribution.
    You must have access to your server via SSH and a root account to use it, which will install the dependencies. Contact your provider if you do not have that.
    The documentation of the use of this installation script is available here.
    The code of this (...)

Sur d’autres sites (5825)

  • How can I create mp4 file with 0 frames in it ? [on hold]

    12 août 2016, par Adam Wróblewski

    I need to create an empty .mp4 file, it needs to have 0 frames in it. How can this be achieved ? Any ideas ?

    edit :
    I have tried rendering 0 frames video from Adobe After Effects (AE doesnt allow this) and setting duration of output video to 0 with ffmpeg -t 0 (it wont aaply, transcodes the whole length)

    purpose :
    I need to concat a video from 10 small parts. I has to be exactly 10 parts, but some of them should be blank(duration 0), so no glitch will be visible

  • ffmpeg how to extract X frames every Y interval from url efficiently

    13 décembre 2018, par Luay Gharzeddine

    I’m trying to gather data for a datascience project, and am downloading frames from online videos using ffmpeg. I want to download a subset of the frames in the video, without needing to be precise about which, the only requirement is that they are reasonably spaced apart from each other.

    I have tried

    ffmpeg -i "http://www.somevideo.com" -r 1 -f image2 "image%06d.jpg"

    and

    ffmpeg -i "http://www.somevideo.com" -vf fps=1 "image%06d.jpg"

    and eventually found the following method

    ffmpeg -ss offset1 -i "http://www.somevideo.com" -ss offset2 -i "http://www.somevideo.com" -map 0:v -frames:v 10 -start_number 0 "image%06d.jpg" -map 1:v -frames:v 10 -start_number 10 "image%06d.jpg"

    and all work, but are slow. I have found a hack where I run the following command multiple times, at different offsets, and it seems to be the fastest (where each ffmpeg command is run in parallel multithreaded)

    ffmpeg -ss offset -i "http://www.somevideo.com" -vframes frames_per_fragment -an -start_number start_index "image%06d.jpg"

    this about 25% faster than the previous method

    Is there a faster way to do this ? The issue is that downloading over a network is a bottleneck, so I want to download only the frames I need. I’m looking to download videos/frames in bulk, so any speed improvement would be helpful.

  • How to skip frames while generating a gif or webm from a video with ffmpeg-pyhton

    24 avril 2020, par UtkuBulkan

    I can currently create gif from video content with the following ffmpeg-python command.

    



    

    vframes=100
ss = 5
ffmpeg.input(video_url, ss=ss).filter('scale', gif_width, -1)
                              .output(out_gif_filename, vframes=vframes, loop=0)
                              .overwrite_output().run()


    


    



    It uses the first 100 frames starting from time 00:05 seconds. I intend to skip some of the frames, for instance every use only 5 frames in a second, in order to make gif faster and consume less space, how can I do that ?

    


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