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  • Pas question de marché, de cloud etc...

    10 avril 2011

    Le vocabulaire utilisé sur ce site essaie d’éviter toute référence à la mode qui fleurit allègrement
    sur le web 2.0 et dans les entreprises qui en vivent.
    Vous êtes donc invité à bannir l’utilisation des termes "Brand", "Cloud", "Marché" etc...
    Notre motivation est avant tout de créer un outil simple, accessible à pour tout le monde, favorisant
    le partage de créations sur Internet et permettant aux auteurs de garder une autonomie optimale.
    Aucun "contrat Gold ou Premium" n’est donc prévu, aucun (...)

  • 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 (...)

  • 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 (12659)

  • Estimate time of transcoding video FFMPEG [on hold]

    9 mars 2019, par Anh Vo Nguyen Nhat

    Currently, I want to assign a video transcoding task to a computer in my distributed network. The computer are heterogeneous, so I have to check whether that computing can handle the task fast enough (during a specified deadline). My approach for this is to run many experiments and then based on the statistics I will try to estimate the time when running another task.

    I am trying to predict beforehand the time it takes when transcoding a video (e.g. transcoding 1920x1080 H264 video to 1280x720 VP9) using FFMPEG tool.
    I have used the following features to build a simple neural network to predict the time :
    - Video Resolution (Input + Output)
    - Video Duration
    - Video Codec (Input + Output)
    - Video Bitrate
    - Video Framerate
    - Number of B, I, P frames

    However, the result is not really promising. I want to ask if there is any other way to estimate/predict the time it takes when transcoding a video ? Are there any other features beside the listed that affects the transcoding time ?

  • ffmpeg cut the video and get accurate begining time of the result

    1er décembre 2022, par Pavlo Sharhan

    I do the cut via :

    


    ffmpeg -i  long_clip.mp4 -ss 00:00:10.0 -c copy -t 00:00:04.0 short_clip.mp4


    


    I need to know the precise time where did the ffmpeg do the cut (Time of the closest keyframe before the 00:00:10.0)

    


    Currently, I'm using the following ffprobe command to list all the keyframes and select the closest before 00:00:10.0

    


    ffprobe -show_frames -skip_frame nokey long_clip.mp4


    


    It works extremely slow (I run It on Jetson Nano, and It is a few minutes to list the keyframes for 30 sec video, although the cutting is done in 0.2seconds)

    


    I hope there is the much faster way to know the time of the keyframe where ffmpeg does the cut, at least because ffmpeg seeks to this keyframe and cuts the video less than in half a second.

    


    So in other words the question is : How to get the time of the keyframe where ffmpeg does the cut not listing all the keyframes ?

    


  • FFMPEG Manipulate the start time [duplicate]

    9 octobre 2018, par Sean

    This question already has an answer here :

    I have an ISMV file (fragmented MP4) which has a set start time (an epoch time) which allows other metadata to synchronise with it.

    if I ffprobe it I get the following ;

    Duration: 00:44:00.28, start: 1537792418.761560, bitrate: 3970 kb/s

    Is it possible to manipulate the start time ?
    I have had to re-encode the file, and it’s start time is now zero.
    I have checked many options, but am really unclear what is possible.

    From what I see I should be looking at a filter with the pts options. But I’m unclear what it should actually be after many hours of searching and fiddling ?

    Cheers in advance.

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