Recherche avancée

Médias (1)

Mot : - Tags -/publier

Autres articles (66)

  • List of compatible distributions

    26 avril 2011, par

    The table below is the list of Linux distributions compatible with the automated installation script of MediaSPIP. Distribution nameVersion nameVersion number Debian Squeeze 6.x.x Debian Weezy 7.x.x Debian Jessie 8.x.x Ubuntu The Precise Pangolin 12.04 LTS Ubuntu The Trusty Tahr 14.04
    If you want to help us improve this list, you can provide us access to a machine whose distribution is not mentioned above or send the necessary fixes to add (...)

  • Le plugin : Podcasts.

    14 juillet 2010, par

    Le problème du podcasting est à nouveau un problème révélateur de la normalisation des transports de données sur Internet.
    Deux formats intéressants existent : Celui développé par Apple, très axé sur l’utilisation d’iTunes dont la SPEC est ici ; Le format "Media RSS Module" qui est plus "libre" notamment soutenu par Yahoo et le logiciel Miro ;
    Types de fichiers supportés dans les flux
    Le format d’Apple n’autorise que les formats suivants dans ses flux : .mp3 audio/mpeg .m4a audio/x-m4a .mp4 (...)

  • 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

Sur d’autres sites (10435)

  • Terminal : How to extract vobsub subtitles to bitmap images (jpg, png) ?

    5 août 2022, par DevonDahon

    How to extract image-based subtitles to bitmap images (jpg, png) ?

    


    I tried with ffmpeg, but it seems to work only with text-based subtitles.

    


    $ ffmpeg -i myvideo.mp4 -map "0:2" output.bre.srt
ffmpeg version 5.0.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with Apple clang version 13.1.6 (clang-1316.0.21.2.5)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/5.0.1_3 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
  libavutil      57. 17.100 / 57. 17.100
  libavcodec     59. 18.100 / 59. 18.100
  libavformat    59. 16.100 / 59. 16.100
  libavdevice    59.  4.100 / 59.  4.100
  libavfilter     8. 24.100 /  8. 24.100
  libswscale      6.  4.100 /  6.  4.100
  libswresample   4.  3.100 /  4.  3.100
  libpostproc    56.  3.100 / 56.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'myvideo.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 512
    compatible_brands: mp42iso2avc1mp41
    creation_time   : 2022-08-03T21:58:07.000000Z
    encoder         : HandBrake 1.5.1 2022011000
  Duration: 00:11:05.40, start: 0.000000, bitrate: 1635 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt470bg/bt470bg, progressive), 712x576 [SAR 16:15 DAR 178:135], 1454 kb/s, 25 fps, 25 tbr, 90k tbn (default)
    Metadata:
      creation_time   : 2022-08-03T21:58:07.000000Z
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](bre): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 162 kb/s (default)
    Metadata:
      creation_time   : 2022-08-03T21:58:07.000000Z
      handler_name    : Stereo
      vendor_id       : [0][0][0][0]
  Stream #0:2[0x3](bre): Subtitle: dvd_subtitle (mp4s / 0x7334706D), 720x576, 6 kb/s (default)
    Metadata:
      creation_time   : 2022-08-03T21:58:07.000000Z
      handler_name    : Brezhoneg
  Stream #0:3[0x4](fra): Subtitle: dvd_subtitle (mp4s / 0x7334706D), 720x576, 6 kb/s
    Metadata:
      creation_time   : 2022-08-03T21:58:07.000000Z
      handler_name    : Français
Error initializing output stream 0:0 -- Subtitle encoding currently only possible from text to text or bitmap to bitmap
Stream mapping:
  Stream #0:2 -> #0:0 (dvd_subtitle (dvdsub) -> subrip (srt))
    Last message repeated 1 times


    


  • Having trouble compiling ffmpeg code in command terminal

    10 septembre 2019, par m00ncake

    I am having a bit of trouble compiling my c++ code in my terminal. I have ffmpeg installed as shown below.

    ffmpeg version n4.1 Copyright (c) 2000-2018 the FFmpeg developers
     built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
     configuration: --enable-gpl --enable-version3 --disable-static --enable-shared --enable-small --enable-avisynth --enable-chromaprint --enable-frei0r --enable-gmp --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-librtmp --enable-libshine --enable-libsmbclient --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtesseract --enable-libtheora --enable-libtwolame --enable-libv4l2 --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libxml2 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-libmysofa --enable-openal --enable-opencl --enable-opengl --enable-libdrm
     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
     libswscale      5.  3.100 /  5.  3.100
     libswresample   3.  3.100 /  3.  3.100
     libpostproc    55.  3.100 / 55.  3.100
    Hyper fast Audio and Video encoder
    usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

    However, when I compile my c++ code, currently trying to get NTP timestamps from private data in ffmpeg but I need to include their headers ? I have looked into ffmpeg’s libavformat folder and it does have rtpdec.h but when I compile it in the command line, i get this error. (trying to include this header for RTSPState and RTSPStream as well as RTPDemuxContext)

    cf.cpp:11:10: fatal error: libavformat/rtsp.h: No such file or directory
    #include <libavformat></libavformat>rtpdec.h>
             ^~~~~~~~~~~~~~~~~~~~
    compilation terminated.

    This is my code :

    #include
    #include
    #include <iostream>
    #include <fstream>
    #include <sstream>

    extern "C" {
    #include <libavcodec></libavcodec>avcodec.h>
    #include <libavformat></libavformat>avformat.h>
    #include <libavformat></libavformat>avio.h>
    #include <libavformat></libavformat>rtpdec.h>
    #include <libswscale></libswscale>swscale.h>
    }

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

       // Open the initial context variables that are needed
       SwsContext *img_convert_ctx;
       AVFormatContext* format_ctx = avformat_alloc_context();
       AVCodecContext* codec_ctx = NULL;
       int video_stream_index;
       uint32_t* last_rtcp_ts;
       double* base_time;
       double* time;

       // Register everything
       av_register_all();
       avformat_network_init();

       //open RTSP
       if (avformat_open_input(&amp;format_ctx, "rtsp://admin:password@192.168.1.67:554",
               NULL, NULL) != 0) {
           return EXIT_FAILURE;
       }

       if (avformat_find_stream_info(format_ctx, NULL) &lt; 0) {
           return EXIT_FAILURE;
       }

       //search video stream
       for (int i = 0; i &lt; format_ctx->nb_streams; i++) {
           if (format_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
               video_stream_index = i;
       }

       AVPacket packet;
       av_init_packet(&amp;packet);

       //open output file
       AVFormatContext* output_ctx = avformat_alloc_context();

       AVStream* stream = NULL;
       int cnt = 0;

       //start reading packets from stream and write them to file
       av_read_play(format_ctx);    //play RTSP

       // Get the codec
       AVCodec *codec = NULL;
       codec = avcodec_find_decoder(AV_CODEC_ID_H264);
       if (!codec) {
           exit(1);
       }

    // Add this to allocate the context by codec
    codec_ctx = avcodec_alloc_context3(codec);

    avcodec_get_context_defaults3(codec_ctx, codec);
    avcodec_copy_context(codec_ctx, format_ctx->streams[video_stream_index]->codec);
    std::ofstream output_file;

    if (avcodec_open2(codec_ctx, codec, NULL) &lt; 0)
       exit(1);

       img_convert_ctx = sws_getContext(codec_ctx->width, codec_ctx->height,
               codec_ctx->pix_fmt, codec_ctx->width, codec_ctx->height, AV_PIX_FMT_RGB24,
               SWS_BICUBIC, NULL, NULL, NULL);

       int size = avpicture_get_size(AV_PIX_FMT_YUV420P, codec_ctx->width,
               codec_ctx->height);
       uint8_t* picture_buffer = (uint8_t*) (av_malloc(size));
       AVFrame* picture = av_frame_alloc();
       AVFrame* picture_rgb = av_frame_alloc();
       int size2 = avpicture_get_size(AV_PIX_FMT_RGB24, codec_ctx->width,
               codec_ctx->height);
       uint8_t* picture_buffer_2 = (uint8_t*) (av_malloc(size2));
       avpicture_fill((AVPicture *) picture, picture_buffer, AV_PIX_FMT_YUV420P,
               codec_ctx->width, codec_ctx->height);
       avpicture_fill((AVPicture *) picture_rgb, picture_buffer_2, AV_PIX_FMT_RGB24,
               codec_ctx->width, codec_ctx->height);

       while (av_read_frame(format_ctx, &amp;packet) >= 0 &amp;&amp; cnt &lt; 1000) { //read ~ 1000 frames

           RTSPState* rt = format_ctx->priv_data;
           RTSPStream *rtsp_stream = rt->rtsp_streams[0];
           RTPDemuxContext* rtp_demux_context = rtsp_stream->transport_priv;
           uint32_t new_rtcp_ts = rtp_demux_context->last_rtcp_timestamp;
           uint64_t last_ntp_time = 0;

           if (new_rtcp_ts != *last_rtcp_ts) {
               *last_rtcp_ts = new_rtcp_ts;
               last_ntp_time = rtp_demux_context->last_rtcp_ntp_time;
               uint32_t seconds = ((last_ntp_time >> 32) &amp; 0xffffffff) - 2208988800;
               uint32_t fraction  = (last_ntp_time &amp; 0xffffffff);
               double useconds = ((double) fraction / 0xffffffff);
               *base_time = seconds + useconds;
               uint32_t d_ts = rtp_demux_context->timestamp - *last_rtcp_ts;
               *time = *base_time + d_ts / 90000.0;
               std::cout &lt;&lt; "Time is: " &lt;&lt; *time &lt;&lt; std::endl;
           }

           std::cout &lt;&lt; "1 Frame: " &lt;&lt; cnt &lt;&lt; std::endl;
           if (packet.stream_index == video_stream_index) {    //packet is video
               std::cout &lt;&lt; "2 Is Video" &lt;&lt; std::endl;
               if (stream == NULL) {    //create stream in file
                   std::cout &lt;&lt; "3 create stream" &lt;&lt; std::endl;
                   stream = avformat_new_stream(output_ctx,
                           format_ctx->streams[video_stream_index]->codec->codec);
                   avcodec_copy_context(stream->codec,
                           format_ctx->streams[video_stream_index]->codec);
                   stream->sample_aspect_ratio =
                           format_ctx->streams[video_stream_index]->codec->sample_aspect_ratio;
               }
               int check = 0;
               packet.stream_index = stream->id;
               std::cout &lt;&lt; "4 decoding" &lt;&lt; std::endl;
               int result = avcodec_decode_video2(codec_ctx, picture, &amp;check, &amp;packet);
               std::cout &lt;&lt; "Bytes decoded " &lt;&lt; result &lt;&lt; " check " &lt;&lt; check
                       &lt;&lt; std::endl;
               if (cnt > 100)    //cnt &lt; 0)
                       {
                   sws_scale(img_convert_ctx, picture->data, picture->linesize, 0,
                           codec_ctx->height, picture_rgb->data, picture_rgb->linesize);
                   std::stringstream file_name;
                   file_name &lt;&lt; "test" &lt;&lt; cnt &lt;&lt; ".ppm";
                   output_file.open(file_name.str().c_str());
                   output_file &lt;&lt; "P3 " &lt;&lt; codec_ctx->width &lt;&lt; " " &lt;&lt; codec_ctx->height
                           &lt;&lt; " 255\n";
                   for (int y = 0; y &lt; codec_ctx->height; y++) {
                       for (int x = 0; x &lt; codec_ctx->width * 3; x++)
                           output_file
                                   &lt;&lt; (int) (picture_rgb->data[0]
                                           + y * picture_rgb->linesize[0])[x] &lt;&lt; " ";
                   }
                   output_file.close();
               }
               cnt++;
           }
           av_free_packet(&amp;packet);
           av_init_packet(&amp;packet);
       }
       av_free(picture);
       av_free(picture_rgb);
       av_free(picture_buffer);
       av_free(picture_buffer_2);

       av_read_pause(format_ctx);
       avio_close(output_ctx->pb);
       avformat_free_context(output_ctx);

       return (EXIT_SUCCESS);
    }
    </sstream></fstream></iostream>

    The command i use to compile my code : g++ -w cf.cpp -o cf $(pkg-config --cflags --libs libavformat libswscale libavcodec)

    I am a bit new to coding in FFmpeg.

  • ffmpeg terminal : How can I re-encode a video file using all the parameters copied from another video ? [closed]

    5 décembre 2022, par Lever

    I have two videos A and B. How can I re-encode B using ALL the parameters of A ?&#xA;I would like to use both A and B as inputs, but all parameters are extracted from A, then B is re-encoded with the A-parameters including both video and audio. Is there a simple command to copy ALL the parameters of A ?

    &#xA;

    Thanks !

    &#xA;

    I know the typical parameters of a video includes the resolution, fps and so on. But it seems that I always miss something rather than get ALL the parameters to make A and B the same.

    &#xA;

    The background is that I need to concatenate about 100 videos, but only a few of which has lower quality than others. I don't want to re-encode all of them. Therefore I'm trying to re-encode the lower ones to match the others, and then I can use the file-level concatenation command avoiding re-encode all of them.

    &#xA;