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Autres articles (56)

  • L’espace de configuration de MediaSPIP

    29 novembre 2010, par

    L’espace de configuration de MediaSPIP est réservé aux administrateurs. Un lien de menu "administrer" est généralement affiché en haut de la page [1].
    Il permet de configurer finement votre site.
    La navigation de cet espace de configuration est divisé en trois parties : la configuration générale du site qui permet notamment de modifier : les informations principales concernant le site (...)

  • HTML5 audio and video support

    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
    The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
    For older browsers the Flowplayer flash fallback is used.
    MediaSPIP allows for media playback on major mobile platforms with the above (...)

  • Récupération d’informations sur le site maître à l’installation d’une instance

    26 novembre 2010, par

    Utilité
    Sur le site principal, une instance de mutualisation est définie par plusieurs choses : Les données dans la table spip_mutus ; Son logo ; Son auteur principal (id_admin dans la table spip_mutus correspondant à un id_auteur de la table spip_auteurs)qui sera le seul à pouvoir créer définitivement l’instance de mutualisation ;
    Il peut donc être tout à fait judicieux de vouloir récupérer certaines de ces informations afin de compléter l’installation d’une instance pour, par exemple : récupérer le (...)

Sur d’autres sites (5831)

  • Where to inject code to print out motion vectors and DC coefficients inside ffmpeg lib

    6 mai 2016, par Kindermann

    For research purposes, I need to extract information about motion vectors and DC coefficients from an MPEG4 video.

    I have inserted many printf into virtually each function inside mpeg4videodec.c and recompiled the ffmpeg library then executed demuxing_decoding.c which is available at : http://ffmpeg.org/doxygen/trunk/demuxing_decoding_8c-example.html

    Surprisingly none of those printf I inserted was shown in the console. Can you give me some hints which file(s) in the ffmpeg library should I touch in order to print out MVectors and DC coefficients of a MPEG4 video file ?

  • ffmpeg unexpected exit code 1 for -list_devices and -list_options

    8 janvier 2024, par djvg

    Description

    


    If I run any of the following commands from the examples in the documentation, using ffmpeg 4.2.2 on Windows 10, the requested information is successfully displayed in the console, but the process exits with exit code 1, instead of the expected 0 (success).

    


    ffmpeg -list_devices true -f dshow -i dummy

ffmpeg -list_options true -f dshow -i video="MyCamera"


    


    As far as I know, exit code 1 on Windows implies "Incorrect function", so I consider this behavior to be unexpected.

    


    If I stream camera input to disk, using e.g. ffmpeg -f dshow -i video="MyCamera" "myfile.mp4", then stop using q, the exit code is 0, as expected.

    


    Question

    


    Does the exit code 1 constitute normal behavior for ffmpeg, or am I doing something wrong ?

    


    Relevance

    


    When running the commands manually, from the command line, the exit code does not make much difference, as long as the requested information is displayed.

    


    However, when running the commands programmatically, it may cause trouble. For example, using Python's subprocess.run(..., check=True), the nonzero exit code causes a CalledProcessError.

    


    Of course there are ways around this, e.g. use check=False, but the point is that a workaround would not be necessary if ffmpeg behaved as expected, i.e. returned 0.

    


  • avformat_write_header return error code when trying to write PCMU encoded frame into avi/mov file

    9 août 2015, par Kaidul Islam

    I am trying to write PCMU G.711 enocded data into avi multimedia container using below program which yields Error occurred when opening output file: Operation not permitted and when using mov container, it yields Error occurred when opening output file: Invalid argument. I set AV_CODEC_ID_PCM_U16LE as audio codec of output format and AV_SAMPLE_FMT_S16 as sample format.

    What’s the problem here ? Thanks in advance !

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