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Médias (1)

Mot : - Tags -/musée

Autres articles (5)

  • Personnaliser les catégories

    21 juin 2013, par

    Formulaire de création d’une catégorie
    Pour ceux qui connaissent bien SPIP, une catégorie peut être assimilée à une rubrique.
    Dans le cas d’un document de type catégorie, les champs proposés par défaut sont : Texte
    On peut modifier ce formulaire dans la partie :
    Administration > Configuration des masques de formulaire.
    Dans le cas d’un document de type média, les champs non affichés par défaut sont : Descriptif rapide
    Par ailleurs, c’est dans cette partie configuration qu’on peut indiquer le (...)

  • 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" ;

  • Configuration spécifique pour PHP5

    4 février 2011, par

    PHP5 est obligatoire, vous pouvez l’installer en suivant ce tutoriel spécifique.
    Il est recommandé dans un premier temps de désactiver le safe_mode, cependant, s’il est correctement configuré et que les binaires nécessaires sont accessibles, MediaSPIP devrait fonctionner correctement avec le safe_mode activé.
    Modules spécifiques
    Il est nécessaire d’installer certains modules PHP spécifiques, via le gestionnaire de paquet de votre distribution ou manuellement : php5-mysql pour la connectivité avec la (...)

Sur d’autres sites (2131)

  • libav how to change stream codec

    9 novembre 2018, par Rodolfo Picoreti

    I am trying to reproduce with libav the same thing that the following ffmpeg command does :

    ffmpeg -f v4l2 -framerate 25 -video_size 640x480 -i /dev/video 0 -f
    mpegts -codec:v mpeg1video -s 640x480 -b:v 1000k -bf 0 -muxdelay
    0.001 http://localhost:8081/supersecret

    I manage to reproduce most part of it. The problem is that when allocating the "mpegts" stream (line 23) the codec that is selected is "mpeg2video", but I need it to be "mpeg1video". I tried forcing the codec_id variable to be "mpeg1video" (line 25) and it kinda worked, although I get a lot of artifacts in the image so I am guessing this is not how you do it. How can I properly change the codec in this case (that is, the "-codec:v mpeg1video" part of the ffmpeg command) ?

    C++ code being used :

    #include <exception>
    
#include <opencv2></opencv2>core.hpp>
    
#include <opencv2></opencv2>highgui.hpp>
    
#include <opencv2></opencv2>imgproc.hpp>
    

    
extern "C" {
    
#include <libavcodec></libavcodec>avcodec.h>
    
#include <libavformat></libavformat>avformat.h>
    
#include <libavutil></libavutil>error.h>
    
#include <libavutil></libavutil>frame.h>
    
#include <libavutil></libavutil>imgutils.h>
    
}
    

    
struct AVStreamer {
    
  AVFormatContext* format_context;
    
  AVStream* stream;
    
  AVCodecContext* codec_context;
    
  AVCodec* codec;
    
  AVFrame* frame;
    
  int64_t next_pts;
    

    
  void init_format_context(const char* url) {
    
    avformat_alloc_output_context2(&amp;format_context, nullptr, "mpegts", url);
    
    if (format_context == nullptr) throw std::runtime_error("Could not create output context");
    
    format_context->oformat->video_codec = AV_CODEC_ID_MPEG1VIDEO;
    
  }
    

    
  void init_codec() {
    
    auto codec_id = format_context->oformat->video_codec;
    
    codec = avcodec_find_encoder(codec_id);
    
    if (codec == nullptr) throw std::runtime_error("Could not find encoder");
    
  }
    

    
  void init_stream() {
    
    stream = avformat_new_stream(format_context, nullptr);
    
    if (stream == nullptr) throw std::runtime_error("Failed to alloc stream");
    
    stream->id = format_context->nb_streams - 1;
    
  }
    

    
  void init_codec_context() {
    
    codec_context = avcodec_alloc_context3(codec);
    
    if (codec_context == nullptr) throw std::runtime_error("Failed to alloc encoding context");
    

    
    auto codec_id = format_context->oformat->video_codec;
    
    codec_context->codec_id = codec_id;
    
    codec_context->bit_rate = 400000;
    
    codec_context->width = 640;
    
    codec_context->height = 480;
    
    stream->time_base = AVRational{1, 30};
    
    codec_context->time_base = stream->time_base;
    
    codec_context->gop_size = 30;  // one intra frame every gop_size
    
    // codec_context->max_b_frames = 0;  // output delayed by max_b_frames
    
    codec_context->pix_fmt = AV_PIX_FMT_YUV420P;
    
    if (codec_context->codec_id == AV_CODEC_ID_MPEG1VIDEO) { codec_context->mb_decision = 2; }
    
    if (format_context->oformat->flags &amp; AVFMT_GLOBALHEADER) {
    
      codec_context->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
    
    }
    
  }
    

    
  void init_frame() {
    
    frame = av_frame_alloc();
    
    if (frame == nullptr) throw std::runtime_error("Failed to alloc frame");
    
    frame->format = codec_context->pix_fmt;
    
    frame->width = codec_context->width;
    
    frame->height = codec_context->height;
    

    
    auto status = av_frame_get_buffer(frame, 32);
    
    if (status &lt; 0) { throw std::runtime_error("Could not allocate frame data.\n"); }
    
  }
    

    
  void open_stream(const char* url) {
    
    int status = avcodec_open2(codec_context, codec, nullptr);
    
    if (status != 0) throw std::runtime_error("Failed to open codec");
    

    
    // copy the stream parameters to the muxer
    
    status = avcodec_parameters_from_context(stream->codecpar, codec_context);
    
    if (status &lt; 0) throw std::runtime_error("Could not copy the stream parameters");
    

    
    av_dump_format(format_context, 0, url, 1);
    

    
    if (!(format_context->oformat->flags &amp; AVFMT_NOFILE)) {
    
      status = avio_open(&amp;format_context->pb, url, AVIO_FLAG_WRITE);
    
      if (status &lt; 0) throw std::runtime_error("Could not open output file");
    
    }
    

    
    // Write the stream header, if any.
    
    status = avformat_write_header(format_context, nullptr);
    
    if (status &lt; 0) throw std::runtime_error("Error occurred when opening output file");
    
  }
    

    
  AVStreamer(const char* url) : next_pts(0) {
    
    init_format_context(url);
    
    init_codec();
    
    init_stream();
    
    init_codec_context();
    
    init_frame();
    
    open_stream(url);
    
  }
    

    
  virtual ~AVStreamer() {
    
    avformat_free_context(format_context);
    
    avcodec_free_context(&amp;codec_context);
    
    av_frame_free(&amp;frame);
    
  }
    

    
  void send(cv::Mat const&amp; image) {
    
    cv::cvtColor(image, image, CV_BGR2YUV);
    
    cv::Mat planes[3];
    
    cv::split(image, planes);
    
    cv::pyrDown(planes[1], planes[1]);
    
    cv::pyrDown(planes[2], planes[2]);
    

    
    if (av_frame_make_writable(frame) &lt; 0) {
    
      throw std::runtime_error("Failed to make frame writable");
    
    }
    

    
    frame->data[0] = planes[0].data;
    
    frame->linesize[0] = planes[0].step;
    
    frame->data[1] = planes[1].data;
    
    frame->linesize[1] = planes[1].step;
    
    frame->data[2] = planes[2].data;
    
    frame->linesize[2] = planes[2].step;
    
    frame->pts = next_pts++;
    

    
    AVPacket packet;
    
    av_init_packet(&amp;packet);
    

    
    int status = avcodec_send_frame(codec_context, frame);
    
    if (status &lt; 0) throw std::runtime_error("Send frame failed");
    

    
    status = avcodec_receive_packet(codec_context, &amp;packet);
    
    if (status == AVERROR(EAGAIN)) { return; }
    
    if (status &lt; 0) throw std::runtime_error("Receive packet failed");
    

    
    av_packet_rescale_ts(&amp;packet, codec_context->time_base, stream->time_base);
    
    packet.stream_index = stream->index;
    
    av_interleaved_write_frame(format_context, &amp;packet);
    
  }
    
};
    

    
int main(int argc, char** argv) {
    
  av_register_all();
    
  avformat_network_init();
    

    
  auto url = argc == 2 ? argv[1] : "http://localhost:8081/supersecret";
    
  AVStreamer streamer(url);
    

    
  cv::VideoCapture video(0);
    
  assert(video.isOpened() &amp;&amp; "Failed to open video");
    

    
  for (;;) {
    
    cv::Mat image;
    
    video >> image;
    
    streamer.send(image);
    
  }
    
}
    
</exception>

  • nginx : [emerg] invalid port in url "http://192.168.0.100:80/live" in nginx.conf - Restreaming OBS to LAN

    17 novembre 2018, par popek069

    I want to restream OBS to LAN. So I set up nginx server. The server receive stream from OBS using RTMP and restreams it to HTTP to view from another device.
    Streaming from OBS works, but when I start nginx I get an error

    PS C:\Users\popek\Downloads\nginx> .\nginx.exe -s reload
    
nginx: [emerg] invalid port in url "http://192.168.0.100:80/live" in C:\Users\popek\Downloads\nginx/conf/nginx.conf:187

    I’m new to nginx and I’m running Windows 10, nginx server and OBS are on the same pc with ip 192.168.0.100
    I’d like to also reencode stream using ffmpeg if it’s possible. I know ffmpeg, I don’t know only how to set input and output.

    Config : (nginx.conf)

    #user  nobody;
    
# multiple workers works !
    
worker_processes  2;
    

    
#error_log  logs/error.log;
    
#error_log  logs/error.log  notice;
    
#error_log  logs/error.log  info;
    

    
#pid        logs/nginx.pid;
    

    

    
events {
    
    worker_connections  8192;
    
    # max value 32768, nginx recycling connections+registry optimization = 
    
    #   this.value * 20 = max concurrent connections currently tested with one worker
    
    #   C1000K should be possible depending there is enough ram/cpu power
    
    # multi_accept on;
    
}
    

    

    
http {
    
    #include      /nginx/conf/naxsi_core.rules;
    
    include       mime.types;
    
    default_type  application/octet-stream;
    

    
    #log_format  main  '$remote_addr:$remote_port - $remote_user [$time_local] "$request" '
    
    #                  '$status $body_bytes_sent "$http_referer" '
    
    #                  '"$http_user_agent" "$http_x_forwarded_for"';
    

    
    #access_log  logs/access.log  main;
    

    
#     # loadbalancing PHP
    
#     upstream myLoadBalancer {
    
#         server 127.0.0.1:9001 weight=1 fail_timeout=5;
    
#         server 127.0.0.1:9002 weight=1 fail_timeout=5;
    
#         server 127.0.0.1:9003 weight=1 fail_timeout=5;
    
#         server 127.0.0.1:9004 weight=1 fail_timeout=5;
    
#         server 127.0.0.1:9005 weight=1 fail_timeout=5;
    
#         server 127.0.0.1:9006 weight=1 fail_timeout=5;
    
#         server 127.0.0.1:9007 weight=1 fail_timeout=5;
    
#         server 127.0.0.1:9008 weight=1 fail_timeout=5;
    
#         server 127.0.0.1:9009 weight=1 fail_timeout=5;
    
#         server 127.0.0.1:9010 weight=1 fail_timeout=5;
    
#         least_conn;
    
#     }
    

    
    sendfile        off;
    
    #tcp_nopush     on;
    

    
    server_names_hash_bucket_size 128;
    

    
## Start: Timeouts ##
    
    client_body_timeout   10;
    
    client_header_timeout 10;
    
    keepalive_timeout     30;
    
    send_timeout          10;
    
    keepalive_requests    10;
    
## End: Timeouts ##
    

    
    #gzip  on;
    

    
    server {
    
        #listen       80;
    
        server_name  localhost;
    

    
        #charset koi8-r;
    

    
        #access_log  logs/host.access.log  main;
    

    
        ## Caching Static Files, put before first location
    
        #location ~* \.(jpg|jpeg|png|gif|ico|css|js)$ {
    
        #    expires 14d;
    
        #    add_header Vary Accept-Encoding;
    
        #}
    

    
# For Naxsi remove the single # line for learn mode, or the ## lines for full WAF mode
    
        location / {
    
            #include    /nginx/conf/mysite.rules; # see also http block naxsi include line
    
            ##SecRulesEnabled;
    
              ##DeniedUrl "/RequestDenied";
    
              ##CheckRule "$SQL >= 8" BLOCK;
    
              ##CheckRule "$RFI >= 8" BLOCK;
    
              ##CheckRule "$TRAVERSAL >= 4" BLOCK;
    
              ##CheckRule "$XSS >= 8" BLOCK;
    
            root   html;
    
            index  index.html index.htm;
    
        }
    

    
# For Naxsi remove the ## lines for full WAF mode, redirect location block used by naxsi
    
        ##location /RequestDenied {
    
        ##    return 412;
    
        ##}
    

    
## Lua examples !
    
#         location /robots.txt {
    
#           rewrite_by_lua '
    
#             if ngx.var.http_host ~= "localhost" then
    
#               return ngx.exec("/robots_disallow.txt");
    
#             end
    
#           ';
    
#         }
    

    
        #error_page  404              /404.html;
    

    
        # redirect server error pages to the static page /50x.html
    
        #
    
        error_page   500 502 503 504  /50x.html;
    
        location = /50x.html {
    
            root   html;
    
        }
    

    
        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
    
        #
    
        #location ~ \.php$ {
    
        #    proxy_pass   http://127.0.0.1;
    
        #}
    

    
        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
    
        #
    
        #location ~ \.php$ {
    
        #    root           html;
    
        #    fastcgi_pass   127.0.0.1:9000; # single backend process
    
        #    fastcgi_pass   myLoadBalancer; # or multiple, see example above
    
        #    fastcgi_index  index.php;
    
        #    fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
    
        #    include        fastcgi_params;
    
        #}
    

    
        # deny access to .htaccess files, if Apache's document root
    
        # concurs with nginx's one
    
        #
    
        #location ~ /\.ht {
    
        #    deny  all;
    
        #}
    
    }
    

    

    
    # another virtual host using mix of IP-, name-, and port-based configuration
    
    #
    
    #server {
    
    #    listen       8000;
    
    #    listen       somename:8080;
    
    #    server_name  somename  alias  another.alias;
    

    
    #    location / {
    
    #        root   html;
    
    #        index  index.html index.htm;
    
    #    }
    
    #}
    

    

    
    # HTTPS server
    
    #
    
    #server {
    
    #    listen       443 ssl spdy;
    
    #    server_name  localhost;
    

    
    #    ssl                  on;
    
    #    ssl_certificate      cert.pem;
    
    #    ssl_certificate_key  cert.key;
    

    
    #    ssl_session_timeout  5m;
    

    
    #    ssl_prefer_server_ciphers On;
    
    #    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    
    #    ssl_ciphers ECDH+AESGCM:ECDH+AES256:ECDH+AES128:ECDH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!eNULL:!MD5:!DSS:!EXP:!ADH:!LOW:!MEDIUM;
    

    
    #    location / {
    
    #        root   html;
    
    #        index  index.html index.htm;
    
    #    }
    
    #}
    

    
}
    

    

    
rtmp {
    
        server {
    
                listen 1935;
    
                chunk_size 4096;
    

    
                application live {
    
                        live on;
    
                        record off;
    
                        hls on;
    
                        push http://192.168.0.100:80/live ;
    
                }
    
        }
    
}

  • Multiple format changes in FFmpeg for thermal camera

    6 février 2023, par Greynol4

    I'm having trouble generating a command to process output from a uvc thermal camera's raw data so that it can be colorized and then output to a virtual device with the intention of streaming it over rtsp. This is on a raspberry pi 3B+ with 32bit bullseye.

    &#xA;

    The original code that works perfectly for previewing it is :

    &#xA;

    ffmpeg -input_format yuyv422 -video_size 256x384 -i /dev/video0 -vf &#x27;crop=h=(ih/2):y=(ih/2)&#x27; -pix_fmt yuyv422 -f rawvideo - | ffplay -pixel_format gray16le -video_size 256x192 -f rawvideo -i - -vf &#x27;normalize=smoothing=10, format=pix_fmts=rgb48, pseudocolor=p=inferno&#x27;&#xA;

    &#xA;

    Essentially what this is doing is taking the raw data, cutting the useful portion out, then piping it to ffplay where it is seen as 16bit grayscale (in this case gray16le), then it is normalized, formatted to 48 bit rgb and then a pseudocolor filter is applied.

    &#xA;

    I haven't been able to get this to translate into ffmpeg-only because it throws codec errors or format errors or converts the 16bit to 10bit even though I need the 16bit. I have tried using v4l2loopback and two instances of ffmpeg in separate windows to see if I could figure out where the error was actually occuring but I suspect that is introducing more format issues that are distracting from the original problem. The closest I have been able to get is

    &#xA;

    ffmpeg -input_format yuyv422 -video_size 256x384 -i /dev/video0 -vf &#x27;crop=h=(ih/2):y=(ih/2)&#x27; -pix_fmt yuyv422 -f rawvideo /dev/video3

    &#xA;

    Followed by

    &#xA;

    ffmpeg -video_size 256x192 -i /dev/video3  -f rawvideo -pix_fmt gray16le -vf &#x27;normalize=smoothing=10,format=pix_fmts=rgb48, pseudocolor=p=inferno&#x27; -f rawvideo -f v4l2 /dev/video4

    &#xA;

    This results in a non colorized but somewhat useful image with certain temperatures showing as missing pixels as opposed to the command with ffplay where it shows a properly colorized stream without missing pixels.

    &#xA;

    I'll include my configuration and log from the preview command but the log doesn't show errors unless I try to modify parameters and presumably mess up the syntax.

    &#xA;

     ffmpeg -input_format yuyv422 -video_size 256x384 -i /dev/video0 -vf &#x27;crop=h=(ih/2):y=(ih/2)&#x27; -pix_fmt yuyv422 -f rawvideo - | ffplay -pixel_format gray16le -video_size 256x192 -f rawvideo -i - -vf &#x27;normalize=smoothing=10, format=pix_fmts=rgb48, pseudocolor=p=inferno&#x27;&#xA;ffplay version N-109758-gbdc76f467f Copyright (c) 2003-2023 the FFmpeg developers&#xA;  built with gcc 10 (Raspbian 10.2.1-6&#x2B;rpi1)&#xA;  configuration: --prefix=/usr/local --enable-nonfree --enable-gpl --enable-hardcoded-tables --disable-ffprobe --disable-ffplay --enable-libx264 --enable-libx265 --enable-sdl --enable-sdl2 --enable-ffplay&#xA;  libavutil      57. 44.100 / 57. 44.100&#xA;  libavcodec     59. 63.100 / 59. 63.100&#xA;  libavformat    59. 38.100 / 59. 38.100&#xA;  libavdevice    59.  8.101 / 59.  8.101&#xA;  libavfilter     8. 56.100 /  8. 56.100&#xA;  libswscale      6.  8.112 /  6.  8.112&#xA;  libswresample   4.  9.100 /  4.  9.100&#xA;  libpostproc    56.  7.100 / 56.  7.100&#xA;ffmpeg version N-109758-gbdc76f467f Copyright (c) 2000-2023 the FFmpeg developers&#xA;  built with gcc 10 (Raspbian 10.2.1-6&#x2B;rpi1)&#xA;  configuration: --prefix=/usr/local --enable-nonfree --enable-gpl --enable-hardcoded-tables --disable-ffprobe --disable-ffplay --enable-libx264 --enable-libx265 --enable-sdl --enable-sdl2 --enable-ffplay&#xA;  libavutil      57. 44.100 / 57. 44.100&#xA;  libavcodec     59. 63.100 / 59. 63.100&#xA;  libavformat    59. 38.100 / 59. 38.100&#xA;  libavdevice    59.  8.101 / 59.  8.101&#xA;  libavfilter     8. 56.100 /  8. 56.100&#xA;  libswscale      6.  8.112 /  6.  8.112&#xA;  libswresample   4.  9.100 /  4.  9.100&#xA;  libpostproc    56.  7.100 / 56.  7.100&#xA;Input #0, video4linux2,v4l2, from &#x27;/dev/video0&#x27;:B sq=    0B f=0/0   &#xA;  Duration: N/A, start: 242.040935, bitrate: 39321 kb/s&#xA;  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 256x384, 39321 kb/s, 25 fps, 25 tbr, 1000k tbn&#xA;Stream mapping:.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   &#xA;  Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))&#xA;Press [q] to stop, [?] for help&#xA;Output #0, rawvideo, to &#x27;pipe:&#x27;:   0KB vq=    0KB sq=    0B f=0/0   &#xA;  Metadata:&#xA;    encoder         : Lavf59.38.100&#xA;  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422(tv, progressive), 256x192, q=2-31, 19660 kb/s, 25 fps, 25 tbn&#xA;    Metadata:&#xA;      encoder         : Lavc59.63.100 rawvideo&#xA;frame=    0 fps=0.0 q=0.0 size=       0kB time=-577014:32:22.77 bitrate=  -0.0kbInput #0, rawvideo, from &#x27;fd:&#x27;:    0KB vq=    0KB sq=    0B f=0/0   &#xA;  Duration: N/A, start: 0.000000, bitrate: 19660 kb/s&#xA;  Stream #0:0: Video: rawvideo (Y1[0][16] / 0x10003159), gray16le, 256x192, 19660 kb/s, 25 tbr, 25 tbn&#xA;frame=   13 fps=0.0 q=-0.0 size=    1152kB time=00:00:00.52 bitrate=18148.4kbitsframe=   25 fps= 24 q=-0.0 size=    2304kB time=00:00:01.00 bitrate=18874.4kbitsframe=   39 fps= 25 q=-0.0 size=    3648kB time=00:00:01.56 bitrate=19156.7kbitsframe=   51 fps= 24 q=-0.0 size=    4800kB time=00:00:02.04 bitrate=19275.3kbitsframe=   64 fps= 24 q=-0.0 size=    6048kB time=00:00:02.56 bitrate=19353.6kbitsframe=   78 fps= 25 q=-0.0 size=    7392kB time=00:00:03.12 bitrate=19408.7kbits&#xA;&#xA;&#xA;

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    I'd also like to use the correct option so it isn't scrolling though every frame in the log as well as links to resources for adapting a command to a script for beginners even though that's outside the purview of this question so any direction on those would be much appreciated.

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