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Médias (16)

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Autres articles (25)

  • Publier sur MédiaSpip

    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
    Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir

  • Support de tous types de médias

    10 avril 2011

    Contrairement à beaucoup de logiciels et autres plate-formes modernes de partage de documents, MediaSPIP a l’ambition de gérer un maximum de formats de documents différents qu’ils soient de type : images (png, gif, jpg, bmp et autres...) ; audio (MP3, Ogg, Wav et autres...) ; vidéo (Avi, MP4, Ogv, mpg, mov, wmv et autres...) ; contenu textuel, code ou autres (open office, microsoft office (tableur, présentation), web (html, css), LaTeX, Google Earth) (...)

  • 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 (4235)

  • Is it safe to set AVPacket::duration to one ?

    9 septembre 2021, par Vivekanand V

    I am new to the world of programming of multimedia applications. I just managed to get a hold of FFMPEG's libraries to perform video encoding and decoding in C/C++ and I feel that I have a lack of understanding in many aspects of the whole process.

    


    My application converts an RGB24 array referenced by unsigned char* to a AVFrame, and encodes it to a video file.

    


    During initialization, I set the time base in codec context to 1/fps, where fps is the frame rate.

    


    AVStream::time_base is also set to the same value.

    


    Is there is a mathematical relationship between these time bases to AV_TIME_BASE constant ?

    


    How should AVFrame::pts be set. Here I am just incrementing by one for every encoding operation.

    


    How should AVPacket::duration be set, before calling av_interleaved_write_frame ?

    


    What is the significance of AVPacket::pts and AVPacket::dts ?

    


  • Revision 888a848453 : Remove redundant reference frame threshold settings When a reference frame type

    12 septembre 2014, par Jingning Han

    Changed Paths :
     Modify /vp9/encoder/vp9_rd.c



    Remove redundant reference frame threshold settings

    When a reference frame type is not in the frame buffer, the mode
    search threshold will be set to INT_MAX, so as to effectively
    turn off the mode entries in the rate-distortion optimization loop
    that involves this reference frame type. This operation is now
    integrated in the ref_frame_skip_mask scheme. This commit hence
    removes the redundant mode search threshold setting.

    Change-Id : Ib18f45da611afda2af275201efd367df7f5101ab

  • how to make ffmpeg process large files faster ?

    12 octobre 2019, par Hakim Douib

    I am using ffmpeg to view video for dash player. But the videos used are more than 1GB, and the server has
    60 GB of RAM
    Ten cores

    The server takes more than 50 hours to process a video.
    The method I use is by separating each operation thread to make it faster ,
    and the files in the end have size between 2 to 5 GB

    dash params variable

    VP9_DASH_PARAMS="-tile-columns 4 -frame-parallel 1"

    cmd :

    ffmpeg  -i  vid_origenal.mp4 -c:v libx265  -s 1920x1080 -b:v 3000k -keyint_min 150 -g 150 ${VP9_DASH_PARAMS} -an -f webm -dash 1  1080.webm >/dev/null 2>&1 &

    I use this for all qualities

    thanks

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