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  • 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

  • Les tâches Cron régulières de la ferme

    1er décembre 2010, par

    La gestion de la ferme passe par l’exécution à intervalle régulier de plusieurs tâches répétitives dites Cron.
    Le super Cron (gestion_mutu_super_cron)
    Cette tâche, planifiée chaque minute, a pour simple effet d’appeler le Cron de l’ensemble des instances de la mutualisation régulièrement. Couplée avec un Cron système sur le site central de la mutualisation, cela permet de simplement générer des visites régulières sur les différents sites et éviter que les tâches des sites peu visités soient trop (...)

  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
    Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
    Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
    Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
    All uploaded files are stored online in their original format, so you can (...)

Sur d’autres sites (9895)

  • using ffmpeg in C : system() or C api ?

    5 décembre 2018, par toastedDeli

    I want to use ffmpeg’s transcoding features multiple times in my program. This can be achieved by doing

    ffmpeg -i input output

    in a terminal. I believe I can use some shell or C code to execute these commands programmatically.

    I could also directly use ffmpeg’s c libraries to do this. My question is, will there be a noticeable performance difference between the 2 approaches ? Obviously the first will be simpler to implement, but will I pay a big performance cost ?

  • Compatibility of P-frames and multithreading in FFmpeg library in C

    16 mai 2023, par Rachel

    I am working on a video processing project using the FFmpeg library in C. I would like to inquire about the compatibility and support for utilizing P-frames (predictive frames) and multithreading simultaneously in FFmpeg. Currently, I am exploring two options for achieving multithreading with FFmpeg :

    


      

    1. Setting the i_threads parameter of FFmpeg to a value greater than 1.

      2. 


    2. My application opens multiple threads, where each thread creates a codec context
and performs parallel compression/decompression of frames from a shared FIFO.

      3. 


    


    I have tried option 1, but I did not observe any noticeable time difference compared to using only one thread. I am seeking an understanding of why this might be the case.

    


    I have tried option 2, which has resulted in improved compression/decompression times for the frames. However, I would like to understand why does it work. Since I am utilizing P-Frames, where each P-frame depends on the latest I-Frame, how can I ensure that the decompression of P-Frames starts after the I-Frame has finished processing when dealing with multiple codec contexts ?

    


    I have two proceccses one for encodeing and one for decoding.
I'd like to improve times using threads in both of them.

    


    The encoder process code :

    


    pt_handle->t_x264_param.i_threads = 24;

    


    pt_handle->pt_x264_encoder = x264_encoder_open(&pt_handle->t_x264_param);

    


    The decoder process code :

    


    pt_handle->pt_avcodec_ctx->thread_count = 23;

    


    pt_handle->pt_avcodec_ctx->thread_type = FF_THREAD_FRAME ;

    


    i_retval = avcodec_open2(pt_handle->pt_avcodec_ctx, pt_h264_decoder, NULL);

    


  • FFMPEG Using video in to add Watermark

    15 janvier 2021, par Lakhan

    I have tried the below code using my Command line.

    


    ffmpeg -i ed_hd.mp4 -i watermark.png -filter_complex "overlay=20:20" 1610690297-6555.mp4

    


    But didn't works this.

    


    And getting error like that.
The encoder 'aac' is experimental but experimental codecs are not enabled, add '-strict -2' if you want to use it.

    


    tried many times didn't get any success on it. if anyone can help on then I am thankful.

    


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