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Autres articles (43)

  • Selection of projects using MediaSPIP

    2 mai 2011, par

    The examples below are representative elements of MediaSPIP specific uses for specific projects.
    MediaSPIP farm @ Infini
    The non profit organizationInfini develops hospitality activities, internet access point, training, realizing innovative projects in the field of information and communication technologies and Communication, and hosting of websites. It plays a unique and prominent role in the Brest (France) area, at the national level, among the half-dozen such association. Its members (...)

  • Sélection de projets utilisant MediaSPIP

    29 avril 2011, par

    Les exemples cités ci-dessous sont des éléments représentatifs d’usages spécifiques de MediaSPIP pour certains projets.
    Vous pensez avoir un site "remarquable" réalisé avec MediaSPIP ? Faites le nous savoir ici.
    Ferme MediaSPIP @ Infini
    L’Association Infini développe des activités d’accueil, de point d’accès internet, de formation, de conduite de projets innovants dans le domaine des Technologies de l’Information et de la Communication, et l’hébergement de sites. Elle joue en la matière un rôle unique (...)

  • Supporting all media types

    13 avril 2011, par

    Unlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)

Sur d’autres sites (5395)

  • How to extract time-accurate video segments with ffmpeg ?

    25 mai 2016, par Jim Miller

    This is not a particularly new question area around here, but I’ve tried what’s been suggested there without much luck. So, my story :

    I’ve got a hunk of 15 seconds of straight-from-the-camera.mov video out of which I want to extract a specific chunk, which I can identify by start time and stop time, in seconds. I started by trying to do what I’ll call a "copy extraction" : to get seconds 9 to 12,

    ffmpeg -i test.mov -vcodec copy -acodec copy -ss 9 -to 12 test-copy.mov

    This was a not-bad start, but there are some black frames at the beginning and end of the clip, which I can’t have — it has to be a clean edit from the original. So, I tried recoding the original into a new, trimmed clip :

    ffmpeg -i test.mov -ss 00:00:09 -t 00:00:03 test-out.mov

    This is better, but not quite : There are no longer any black frames at the beginning of the clip, but they’re still there at the end.

    After some more browsing and reading, I then suspected that the problem is that ffmpeg is having trouble finding the proper points because of a lack of keyframes in the original video. So I recoded the original video to (presumably) add keyframes, in a couple of different ways. Since I want to be able to pick video at boundaries of a second ("from 9 seconds to 12 seconds"), I tried, copying various suggestions around the web,

    ffmpeg -i test.mov -force_key_frames "expr:gte(t, n_forced)" test-forced.mp4

    and

    ffmpeg -i test.mov -g 1 test-g-inserted.mp4

    (I built these as mp4’s based on some comments about an mp4 container being needed to support the keyframe search, but I’m honestly just hacking here.) I then tried the extraction as before, but on these new videos that presumably now have keyframes in them. No luck — both seem to be about the same ; the start is OK but there are still black frames at the end. (FWIW, both test-forced.mp4 and test-g-inserted.mp4 also have trailing black frames.)

    So : I’m still stuck, and would like to not be. Any insights out there as to what I’m doing wrong ? I feel like I’m close, but I really need to get rid of those trailing black frames....

  • Revision 32737 : habillage par defaut de Zpip utilise les conventions documentees

    8 novembre 2009, par cedric@… — Log

    habillage par defaut de Zpip utilise les conventions documentees

  • Revision 33460 : suite a discussion sur spip-dev, mettre le logo et le titre de l’article ...

    2 décembre 2009, par cedric@… — Log

    suite a discussion sur spip-dev, mettre le logo et le titre de l’article dans le meme pour fluidifier la lecture des revues d’ecran

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