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• Intégrer le plugin OCR

  3 septembre 2013

  Sylvain a créé un plugin OCR permettant d’extraire le contenu textuel d’une image, notamment les scans de documents, afin de pouvoir en disposer dans la recherche.

  Nécessite une dépendance logiciel "tesseract".

  Tâches à réaliser

  ?	Titre	#
  	Installer la dépendance logiciel dans les scripts	#1
  	Ajouter le plugin ? dans le script de téléchargement automatique	#2
  	Intégrer la configuration à MediaSPIP Config	#3
  	Regarder si on ne peut pas passer par FACD pour éviter d’attendre trop lors de l’upload	#4

• Matplotlib : animation saved with trace

  25 mai 2020, par Thiziri yoor

  In the following Python code, I am trying to make an animation of a 2 rotating vectors around the origin. I am using matplotlib 3.2.1 and Python 3.8.2 on Ubuntu 20.04.

  



  
import numpy as np
import matplotlib.pyplot as plt

from matplotlib.animation import FuncAnimation


r = 2.0

def circle(phi):
    return np.array([r*np.cos(phi), r*np.sin(phi)])

fig, ax = plt.subplots(figsize=(10,6))
ax.axis([-3.5*r,3.5*r,-2.5*r,2.5*r])
ax.get_xaxis().set_visible(False)
ax.get_yaxis().set_visible(False)

# set equal aspect
ax.set_aspect("equal")

point, = ax.plot(0, r, marker="o")


traj = plt.Circle((0,0), r, fill=False, color='black')
ax.add_artist(traj) # draw the circular trajectory

def update(phi):

    x, y = circle(phi)
    point.set_data([x], [y])
    er_vec = np.array([0.5*x, 0.5*y])
    eθ_vec = np.array([-0.5*y, 0.5*x])


    er_arr = plt.arrow(x, y, dx=er_vec[0], dy=er_vec[1], head_width=0.1, head_length=0.2, color='gray')
    eθ_arr = plt.arrow(x, y, dx=eθ_vec[0], dy=eθ_vec[1], head_width=0.1, head_length=0.2, color='grey')

    annot_er = plt.text(1.7*x, 1.7*y, r'$\mathbf{e}_r$', fontsize=11)
    annot_eθ = plt.text(1.1*(x-0.5*y), 1.1*(y+0.5*x), r'$\mathbf{e}_\theta$', fontsize=11) 

    ax.add_artist(er_arr)    
    ax.add_artist(eθ_arr)
    ax.add_artist(annot_er)
    ax.add_artist(annot_eθ)
    return point, er_arr, eθ_arr, annot_er, annot_eθ

anim = FuncAnimation(fig, update, interval=10, blit=True, repeat=False, frames=np.linspace(0, 2.0*np.pi, 360, endpoint=False))
plt.show()


  



  The code above runs smoothly and without any issues.
This is a screenshot of the animation :

  



  

  



  However, when I try to save the animation to an mp4 video :

  



  anim.save('anim-issue.mp4', writer='ffmpeg')


  



  the animation in the video appears with traces which, something like this screenshot :

  



  

  



  Could someone help me fix that issue with the video animation ?

  



  I appreciate your help.

  



  Edit 1 : According to this answer this is due to blit=True. But that doesn't solve the issue here, since the arrows have no set_position method.

  



  Edit 2 : I found another related question with the same issue I described above but I don't know how to adapt my code to make it work as expected in both cases (plt.show, anim.save).

  


• Streaming issues with HLS setup using Nginx and FFmpeg, and TS video files

  12 septembre 2024, par Jacob Anderson

  I've been working on setting up an HLS stream on my Raspberry Pi to broadcast video from a security camera that's physically connected to my Raspberry Pi through my web server, making it accessible via my website. The .ts video files and the .m3u8 playlist are correctly being served from /var/www/html/hls. However, when I attempt to load the stream on Safari (as well as other browsers), the video continuously appears to be loading without ever displaying any content.

  


  Here are some details about my setup :

  


  

  • Camera : I am using an Arducam 1080p Day & Night Vision USB Camera which is available on /dev/video0.

  


  • Server Configuration : I haven't noticed any errors in the Safari console or on the server logs. When I access the .ts files directly from the browser, they only show a black screen but they do play.

  


  


  Given the situation, I suspect there might be an issue with my FFmpeg command or possibly with my Nginx configuration.

  


  Here is what I have :

  


  ffmpeg stream service :
/etc/systemd/system/ffmpeg-stream.service

  


  [Unit]
Description=FFmpeg RTMP Stream
After=network.target

[Service]
ExecStart=/usr/local/bin/start_ffmpeg.sh
Restart=always
User=jacobanderson
Group=jacobanderson
StandardError=syslog
SyslogIdentifier=ffmpeg-stream
Environment=FFMPEG_LOGLEVEL=error

[Install]
WantedBy=multi-user.target


  


  ffmpeg command :
/usr/local/bin/start_ffmpeg.sh

  


  #!/bin/bash

/usr/bin/ffmpeg -f v4l2 -input_format mjpeg -video_size 1280x720 -framerate 30 -i /dev/video0 -vcodec libx264 -preset veryfast -acodec aac -strict -2 -f flv rtmp://localhost/live/


  


  nginx.conf :
/etc/nginx/nginx.conf

  


  user www-data;
worker_processes auto;
pid /run/nginx.pid;
error_log /var/log/nginx/error.log;
include /etc/nginx/modules-enabled/*.conf;

events {
    worker_connections 768;
    # multi_accept on;
}

rtmp {
    server {
        listen 1935;
        chunk_size 4096;
        #allow publish 127.0.0.1;
        #deny publish all;

    application live {
        #allow 192.168.0.100;
        live on;
        hls on;
        hls_path /var/www/html/hls;
        hls_fragment 3;
        hls_nested on; 
        #hls_fragment_naming stream;
        hls_playlist_length 120;
        hls_cleanup on;
        hls_continuous on;
        #deny play all;
    }
    }
}

http {
    ##
    # Basic Settings
    ##

    sendfile on;
    #sendfile off;
    tcp_nopush on;
    types_hash_max_size 2048;
    # server_tokens off;

    # Additional for video
    directio 512;

    # server_names_hash_bucket_size 64;
    # server_name_in_redirect off;

    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    ##
    # SSL Settings
    ##

    ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
    #ssl_protocols TLSv1.2 TLSv1.3; # Use only secure protocols
    ssl_prefer_server_ciphers on;
    #ssl_ciphers "HIGH:!aNULL:!MD5";

    ##
    # Logging Settings
    ##

    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;

    ##
    # Gzip Settings
    ##

    #gzip on;
    gzip off;  # Ensure gzip is off for HLS

    ##
    # Virtual Host Configs
    ##

    include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites-enabled/*;
}


  


  sites-available :
/etc/nginx/sites-available/myStream.mysite.com

  


  server {
    listen 443 ssl;
    server_name myStream.mysite.com;

    ssl_certificate /etc/letsencrypt/live/myStream.mysite.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/myStream.mysite.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

    location / {
        root /var/www/html/hls;
        index index.html;
    }

    location /hls {
        # Password protection
        auth_basic "Restricted Content";
        auth_basic_user_file /etc/nginx/.htpasswd;

        # Disable cache
        add_header Cache-Control no-cache;

        # CORS setup
        add_header 'Access-Control-Allow-Origin' '*' always;
        add_header 'Access-Control-Expose-Headers' 'Content-Length';

        # Allow CORS preflight requests
        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' '*';
            add_header 'Access-Control-Max-Age' 1728000;
            add_header 'Content-Type' 'text/plain charset=UTF-8';
            add_header 'Content-Length' 0;
            return 204;
        }

        types {
            application/vnd.apple.mpegurl m3u8;
            video/mp2t ts;
        text/html html;
        text/css css;
        }

    root /var/www/html;
    }
}

server {
    listen 80;
    server_name myStream.mysite.com;

    if ($host = myStream.mysite.com) {
        return 301 https://$host$request_uri;
    }

    return 404; # managed by Certbot
}


  


  index.html :
/var/www/html/hls/index.html

  


  &#xA;&#xA;&#xA;    &#xA;    &#xA;    &#xA;    &#xA;    <code class="echappe-js">&lt;script src='http://stackoverflow.com/feeds/tag/js/hls.min.js'&gt;&lt;/script&gt;&#xA;&#xA;&#xA;    &#xA;        &#xA;    &#xA;    &#xA;&#xA;    &lt;script src=&quot;https://vjs.zencdn.net/7.10.2/video.js&quot;&gt;&lt;/script&gt;&#xA;    &lt;script&gt;&amp;#xA;        if (Hls.isSupported()) {&amp;#xA;            var video = document.getElementById(&amp;#x27;my-video_html5_api&amp;#x27;); // Updated ID to target the correct video element&amp;#xA;            var hls = new Hls();&amp;#xA;            hls.loadSource(&amp;#x27;https://myStream.mysite.com/hls/index.m3u8&amp;#x27;);&amp;#xA;            hls.attachMedia(video);&amp;#xA;            hls.on(Hls.Events.MANIFEST_PARSED,function() {&amp;#xA;                video.play();&amp;#xA;            });&amp;#xA;        } else if (video.canPlayType(&amp;#x27;application/vnd.apple.mpegurl&amp;#x27;)) {&amp;#xA;            video.src = &amp;#x27;https://myStream.mysite.com/hls/index.m3u8&amp;#x27;;&amp;#xA;            video.addEventListener(&amp;#x27;loadedmetadata&amp;#x27;, function() {&amp;#xA;                video.play();&amp;#xA;            });&amp;#xA;        }&amp;#xA;    &lt;/script&gt;&#xA;&#xA;&#xA;

  


  Has anyone experienced similar issues or can spot an error in my configuration ? Any help would be greatly appreciated as I have already invested over 30 hours trying to resolve this.