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Autres articles (27)

  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
    autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs

  • MediaSPIP Player : problèmes potentiels

    22 février 2011, par

    Le lecteur ne fonctionne pas sur Internet Explorer
    Sur Internet Explorer (8 et 7 au moins), le plugin utilise le lecteur Flash flowplayer pour lire vidéos et son. Si le lecteur ne semble pas fonctionner, cela peut venir de la configuration du mod_deflate d’Apache.
    Si dans la configuration de ce module Apache vous avez une ligne qui ressemble à la suivante, essayez de la supprimer ou de la commenter pour voir si le lecteur fonctionne correctement : /** * GeSHi (C) 2004 - 2007 Nigel McNie, (...)

  • 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 (...)

Sur d’autres sites (6863)

  • how to generate frames using ffmpeg `select` filter with custom function

    14 février 2023, par Ricky

    I got a video, and want to generate some frames to be my video cover candidates which should satisfied with some conditions below :

    


      

    1. frame in vary scenes.

      2. 


    2. frame contain person with good look, no eyes closed and etc.

      3. 


    


    I found ffmpeg select filter abilities, like

    


    ffmpeg -i input.mp4 -vf "select=gt(scene\,0.4)" -frames:v 5 -vsync vfr frames-diff-%02d.png


    


    can generate frames that have more than 40% scene change compared to the previous frames.

    


    I just found that only built-in select expressions support and no customization support.

    


      

    1. Does ffmpeg support external function/api/local command/script to give a frame select evaluation ?

      2. 


    2. Is there any other solutions to complete my goal ?

      3. 


    


    Thanks.

    


  • How to insert a key frame(Iframe) to a h.264 video stream in ffmpeg C++ api ?

    8 décembre 2015, par fcjy

    I have a real time video stream, and want to cut some video clips from it by accurate timestamp(pts).

    When I receiver an avpacket, I decode it, and do something and cache the avpacket. I don’t want to re-encode all avpackets, it cost cpu resource.

    There are many gop structure in H.264 stream, usually we should cut the video begin at the key frame, and end at the key frame. Otherwise the front some frames in the video clip would display error.

    Now I use av_write_frame to make avpacket to video. But sometimes the length of gop is very long, such as it could be 250, 8.3s(30 frame per second). It means the distance between two I-frame could be 250 frames. The video clip is short, I don’t want to add too many unused frames.

    How should I do ? I think i should insert a i-frame at the start position of video clip. Could I change a p-frame to i-frame ?

    Thanks your reading !

  • avformat/matroskaenc : write a MaxBlockAdditionID element

    19 mars 2023, par James Almer
    avformat/matroskaenc : write a MaxBlockAdditionID element

    A non zero value is mandatory for Matroska if the track has blocks with BlockAdditions.
    

    Signed-off-by : James Almer <jamrial@gmail.com>
    • [DH] libavformat/matroskaenc.c
    • [DH] tests/ref/fate/aac-autobsf-adtstoasc
    • [DH] tests/ref/fate/matroska-avoid-negative-ts
    • [DH] tests/ref/fate/matroska-dovi-write-config7
    • [DH] tests/ref/fate/matroska-dovi-write-config8
    • [DH] tests/ref/fate/matroska-dvbsub-remux
    • [DH] tests/ref/fate/matroska-encoding-delay
    • [DH] tests/ref/fate/matroska-flac-extradata-update
    • [DH] tests/ref/fate/matroska-h264-remux
    • [DH] tests/ref/fate/matroska-mastering-display-metadata
    • [DH] tests/ref/fate/matroska-move-cues-to-front
    • [DH] tests/ref/fate/matroska-mpegts-remux
    • [DH] tests/ref/fate/matroska-ms-mode
    • [DH] tests/ref/fate/matroska-ogg-opus-remux
    • [DH] tests/ref/fate/matroska-opus-remux
    • [DH] tests/ref/fate/matroska-pgs-remux
    • [DH] tests/ref/fate/matroska-pgs-remux-durations
    • [DH] tests/ref/fate/matroska-qt-mode
    • [DH] tests/ref/fate/matroska-spherical-mono-remux
    • [DH] tests/ref/fate/matroska-vp8-alpha-remux
    • [DH] tests/ref/fate/matroska-zero-length-block
    • [DH] tests/ref/fate/rgb24-mkv
    • [DH] tests/ref/fate/shortest-sub
    • [DH] tests/ref/lavf-fate/av1.mkv
    • [DH] tests/ref/lavf/mka
    • [DH] tests/ref/lavf/mkv
    • [DH] tests/ref/lavf/mkv_attachment
    • [DH] tests/ref/seek/lavf-mkv

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