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Autres articles (37)

  • 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

  • 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 (...)

  • Emballe médias : à quoi cela sert ?

    4 février 2011, par

    Ce plugin vise à gérer des sites de mise en ligne de documents de tous types.
    Il crée des "médias", à savoir : un "média" est un article au sens SPIP créé automatiquement lors du téléversement d’un document qu’il soit audio, vidéo, image ou textuel ; un seul document ne peut être lié à un article dit "média" ;

Sur d’autres sites (8018)

  • Cannot Play Video Output of Libavcodec (ffmpeg) Encoding Example

    29 octobre 2019, par user3707763

    From FFMPEG’s GitHub, I use the encode_video.c to generate a 1 second video. Here is the example in question : https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/encode_video.c

    I compile with : gcc -Wall -o ffencode encode_video.c -lavcodec -lavutil -lz -lm

    Clean compile, zero warnings.

    I test the program by running : ./ffencode video.mp4 libx264

    Lots of stats printed out (expected based on source code) as well as ffmpeg logs, but ultimately no errors or warnings.

    However, then the generated output video.mp4, can only be played by ffplay, and VLC Player (as well as Google Chrome) fail to play the video.

    Playing it via vlc command line actually prints :

    [00007ffd3550fec0] main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
    
TagLib: MP4: Invalid atom size
    
TagLib: MP4: Invalid atom size
    
TagLib: MP4: Invalid atom size

    Looking at ffprobe output, the bitrate and duration fields are empty :

    Input #0, h264, from 'video.mp4':
    
  Duration: N/A, bitrate: N/A
    
    Stream #0:0: Video: h264 (High), yuv420p(progressive), 352x288, 25 fps, 25 tbr, 1200k tbn, 50 tbc

    I am using ffmpeg 4.1 with the following configuration :

    ffprobe version 4.1 Copyright (c) 2007-2018 the FFmpeg developers
    
  built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gpl --enable-libmp3lame --enable-libopus --enable-libsnappy --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-opencl --enable-videotoolbox
    
  libavutil      56. 22.100 / 56. 22.100
    
  libavcodec     58. 35.100 / 58. 35.100
    
  libavformat    58. 20.100 / 58. 20.100
    
  libavdevice    58.  5.100 / 58.  5.100
    
  libavfilter     7. 40.101 /  7. 40.101
    
  libavresample   4.  0.  0 /  4.  0.  0
    
  libswscale      5.  3.100 /  5.  3.100
    
  libswresample   3.  3.100 /  3.  3.100
    
  libpostproc    55.  3.100 / 55.  3.100

    Any ideas how to fix this ? It is pretty surprising to see an API’s official example to be lacking such basic information.

  • How to make audio sound batter ? (C + FFMpeg audio generation example)

    31 janvier 2014, par Spender

    So I found this grate C FFMpeg official example which I simplified :

    #include 
    
#include 
    
#include 
    

    
#ifdef HAVE_AV_CONFIG_H
    
#undef HAVE_AV_CONFIG_H
    
#endif
    

    
#include "libavcodec/avcodec.h"
    
#include "libavutil/mathematics.h"
    

    
#define INBUF_SIZE 4096
    
#define AUDIO_INBUF_SIZE 20480
    
#define AUDIO_REFILL_THRESH 4096
    

    
/*
    
 * Audio encoding example
    
 */
    
static void audio_encode_example(const char *filename)
    
{
    
    AVCodec *codec;
    
    AVCodecContext *c= NULL;
    
    int frame_size, i, j, out_size, outbuf_size;
    
    FILE *f;
    
    short *samples;
    
    float t, tincr;
    
    uint8_t *outbuf;
    

    
    printf("Audio encoding\n");
    

    
    /* find the MP2 encoder */
    
    codec = avcodec_find_encoder(CODEC_ID_MP2);
    
    if (!codec) {
    
        fprintf(stderr, "codec not found\n");
    
        exit(1);
    
    }
    

    
    c= avcodec_alloc_context();
    

    
    /* put sample parameters */
    
    c->bit_rate = 64000;
    
    c->sample_rate = 44100;
    
    c->channels = 2;
    

    
    /* open it */
    
    if (avcodec_open(c, codec) < 0) {
    
        fprintf(stderr, "could not open codec\n");
    
        exit(1);
    
    }
    

    
    /* the codec gives us the frame size, in samples */
    
    frame_size = c->frame_size;
    
    samples = malloc(frame_size * 2 * c->channels);
    
    outbuf_size = 10000;
    
    outbuf = malloc(outbuf_size);
    

    
    f = fopen(filename, "wb");
    
    if (!f) {
    
        fprintf(stderr, "could not open %s\n", filename);
    
        exit(1);
    
    }
    

    
    /* encode a single tone sound */
    
    t = 0;
    
    tincr = 2 * M_PI * 440.0 / c->sample_rate;
    
    for(i=0;i<200;i++) {
    
        for(j=0;j* encode the samples */
    
        out_size = avcodec_encode_audio(c, outbuf, outbuf_size, samples);
    
        fwrite(outbuf, 1, out_size, f);
    
    }
    
    fclose(f);
    
    free(outbuf);
    
    free(samples);
    

    
    avcodec_close(c);
    
    av_free(c);
    
}
    

    
int main(int argc, char **argv)
    
{
    

    
    /* must be called before using avcodec lib */
    
    avcodec_init();
    

    
    /* register all the codecs */
    
    avcodec_register_all();
    

    
    audio_encode_example("test.mp2");
    

    
    return 0;
    
}

    How should it sound like ? May be I don't get something but it sounds awful =( how to make audio generation sound batter/ more interesting/ melodical in a wary shourt way (no special functions just how to change this code to make it sound batter) ?

  • I can't install ffmpegs (dependencies) - error with doxygen [mac 10.12.6 Sierra]

    12 septembre 2022, par Lo-Fi Junky

    It installed about 70% of the dependencies it needed to get ffmpegs going, but it got stuck at installing 'doxygen'.

    


    This is the error I got :

    


    ==> Installing dependencies for ffmpeg: doxygen, little-cms2, openjpeg, opus, rust, libgit2, cargo-c, rav1e, flac, libsndfile, libsamplerate, rubberband, sdl2, swig, llvm, snappy, speex, srt, leptonica, libb2, lz4, libarchive, tesseract, theora, x264, x265, xvid, docbook, boost, source-highlight, asciidoc, docbook-xsl, libyaml, ruby, asciidoctor, gnu-getopt, xmlto, libsodium, zeromq and zimg&#xA;==> Installing ffmpeg dependency: doxygen&#xA;==> cmake ..&#xA;==> make&#xA;Last 15 lines from /Users/macbook/Library/Logs/Homebrew/doxygen/02.make:&#xA;In file included from /tmp/doxygen-20220723-61533-5m5mdv/doxygen-1.9.4/src/outputlist.h:25:&#xA;/tmp/doxygen-20220723-61533-5m5mdv/doxygen-1.9.4/src/searchindex.h:29:10: fatal error: &#x27;variant&#x27; file not found&#xA;#include <variant>&#xA;         ^~~~~~~~~&#xA;1 error generated.&#xA;make[2]: *** [src/CMakeFiles/doxymain.dir/__/generated_src/code.cpp.o] Error 1&#xA;make[1]: *** [src/CMakeFiles/doxymain.dir/all] Error 2&#xA;make[1]: *** Waiting for unfinished jobs....&#xA;[ 46%] Linking CXX static library ../lib/libvhdlparser.a&#xA;cd /tmp/doxygen-20220723-61533-5m5mdv/doxygen-1.9.4/build/vhdlparser &amp;&amp; /usr/local/Cellar/cmake/3.23.2/bin/cmake -P CMakeFiles/vhdlparser.dir/cmake_clean_target.cmake&#xA;cd /tmp/doxygen-20220723-61533-5m5mdv/doxygen-1.9.4/build/vhdlparser &amp;&amp; /usr/local/Cellar/cmake/3.23.2/bin/cmake -E cmake_link_script CMakeFiles/vhdlparser.dir/link.txt --verbose=1&#xA;/usr/bin/ar qc ../lib/libvhdlparser.a CMakeFiles/vhdlparser.dir/CharStream.cc.o CMakeFiles/vhdlparser.dir/ParseException.cc.o CMakeFiles/vhdlparser.dir/Token.cc.o CMakeFiles/vhdlparser.dir/TokenMgrError.cc.o CMakeFiles/vhdlparser.dir/__/generated_src/VhdlParser_adj.cc.o CMakeFiles/vhdlparser.dir/VhdlParserTokenManager.cc.o&#xA;/usr/bin/ranlib ../lib/libvhdlparser.a&#xA;[ 46%] Built target vhdlparser&#xA;make: *** [all] Error 2&#xA;&#xA;Do not report this issue to Homebrew/brew or Homebrew/core!&#xA;&#xA;&#xA;Error: You are using macOS 10.12.&#xA;We (and Apple) do not provide support for this old version.&#xA;You will encounter build failures with some formulae.&#xA;Please create pull requests instead of asking for help on Homebrew&#x27;s GitHub,&#xA;Twitter or any other official channels. You are responsible for resolving&#xA;any issues you experience while you are running this&#xA;old version.&#xA;</variant>

    &#xA;

    Can someone please help me am not sure what it is, that I am supposed to do.

    &#xA;

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