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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

  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

  • Contribute to translation

    13 avril 2011

    You can help us to improve the language used in the software interface to make MediaSPIP more accessible and user-friendly. You can also translate the interface into any language that allows it to spread to new linguistic communities.
    To do this, we use the translation interface of SPIP where the all the language modules of MediaSPIP are available. Just subscribe to the mailing list and request further informantion on translation.
    MediaSPIP is currently available in French and English (...)

Sur d’autres sites (8911)

  • Anomalie #4052 : Visualiser ses messages dans le privé

    28 novembre 2017, par tcharlss (*´_ゝ｀)

    J’ai bien ce lien sur contrib, spip.net et forum. C’est tout en bas de la boîte d’infos :

    AUTEUR NUMÉRO

    6944
    

    Je suis rédacteur
    
4 articles
    
24 messages de forum
    
Voir en ligne

  • Ghost image issues with ffmpeg -filter_complex displace

    5 juillet 2022, par raul.vila

    I've (almost) been able to apply a displacement based on 2 animated gaussian noise videos, but I'm having issues with a ghost image. A picture is worth a thousand words.

    


    Here you have a script to replicate the issue :

    


    ffmpeg -y -t 2 -f lavfi -i color=c=blue:s=160x120 -c:v libx264 -tune stillimage -pix_fmt rgb24 00_empty.mp4
ffmpeg -y -i 00_empty.mp4 -vf "drawtext=text=string1:y=h/2:x=w-t*w/2:fontcolor=white:fontsize=60" 01_text.mp4
ffmpeg -y -t 2 -f lavfi -i color=c=gray:s=160x120 -c:v libx264 -tune stillimage -pix_fmt rgb24 02_gray.mp4
ffmpeg -y -i 01_text.mp4 -i 02_gray.mp4 -i 02_gray.mp4 -filter_complex "[0][1][2]displace=edge=mirror" 03_displaced_text.mp4


    


    It creates a test video with a scrolling text and a gray dummy video. Then it applies a displacement based on the gray video. If I understand correctly, because the gray video is 100% gray, it should leave the video unchanged (or maybe displace everything by a fixed ammount of pixels), but it creates a "shadow". I tried with 3 different pixel formats (yuv420p, yuv444p, rgb24) because I found this question on stackoverflow talking about that :

    


    


    ffmpeg version 5.0.1-full_build-www.gyan.dev

    


    Any idea will be welcome.
    
Thanks !

    


  • How to reduce the latency of CMAF ?

    13 juin 2023, par dannyomni

    I implemented CMAF through a self-built nginx server with ffmpeg, but I encountered some technical bottlenecks. My latency always remains at 3 seconds and cannot be further reduced. Additionally, I'm unable to successfully implement chunked transfer.

    


    Briefly describe my environment, I use OBS to push the live stream to the server, then transcode it on the server, and finally push the content to users through CDN.

    


    Here is some of my code

    


    ffmpeg :

    


    sudo ffmpeg -i rtmp://127.0.0.1:1935/live/stream -loglevel 40 -c copy -sc_threshold 0 -g 60 -bf 0 -map 0 -f dash -strict experimental -use_timeline 1 -use_template 1 -seg_duration 1 -window_size 5 -adaptation_sets "id=0,streams=v id=1,streams=a" -streaming 1 -dash_segment_type mp4 -utc_timing_url "http://time.akamai.com/?iso" -movflags frag_keyframe+empty_moov+default_base_moof -ldash 1 -hls_playlist 1 -master_m3u8_publish_rate 1 -remove_at_exit 1 /var/www/html/live/manifest.mpd


    


    nignx config :

    


    server_name myserver.com;
    add_header Access-Control-Allow-Origin *;
    add_header Access-Control-Allow-Methods 'GET, POST, OPTIONS';
    add_header Access-Control-Allow-Headers 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
    add_header Access-Control-Expose-Headers 'Content-Length,Content-Range';
    root /var/www/html;
    index index.html index.nginx-debian.html;
        location / {
            chunked_transfer_encoding on;
        }


    


    html player

    


    &#xA;&#xA;&#xA;    &#xA;    &#xA;    &#xA;    <code class="echappe-js">&lt;script src=&quot;https://cdn.jsdelivr.net/npm/hls.js@latest&quot;&gt;&lt;/script&gt;&#xA;    &lt;script src=&quot;https://cdn.dashjs.org/latest/dash.all.min.js&quot;&gt;&lt;/script&gt;&#xA;    &#xA;&#xA;&#xA;    &#xA;&#xA;    &lt;script&gt;&amp;#xA;        const video = document.getElementById(&amp;#x27;video&amp;#x27;);&amp;#xA;        const hlsSrc = &amp;#x27;/live/master.m3u8&amp;#x27;; // Replace with your HLS stream URL&amp;#xA;        const dashSrc = &amp;#x27;/live/stream.mpd&amp;#x27;; // Replace with your DASH stream URL&amp;#xA;&amp;#xA;        function isHlsSupported() {&amp;#xA;            return Hls.isSupported() || video.canPlayType(&amp;#x27;application/vnd.apple.mpegurl&amp;#x27;);&amp;#xA;        }&amp;#xA;&amp;#xA;        function isDashSupported() {&amp;#xA;            return !!window.MediaSource &amp;amp;&amp;amp; !!MediaSource.isTypeSupported(&amp;#x27;video/mp4; codecs=&quot;avc1.4d401e,mp4a.40.2&quot;&amp;#x27;);&amp;#xA;        }&amp;#xA;&amp;#xA;        if (isHlsSupported()) {&amp;#xA;            // Use HLS for playback&amp;#xA;            const hls = new Hls({&amp;#xA;                lowLatencyMode: true,// Enable low-latency mode&amp;#xA;                liveSyncDurationCount: 1, // Number of segments used to sync live stream&amp;#xA;                liveMaxLatencyDurationCount: 2,// Number of segments used to calculate the latency&amp;#xA;                maxBufferLength: 2,// Max buffer length in seconds&amp;#xA;                maxBufferSize: 1000 * 1000 * 100,// Max buffer size in bytes&amp;#xA;                liveBackBufferLength: 0// Max back buffer length in seconds (0 means back buffer disabled)&amp;#xA;            });&amp;#xA;            hls.loadSource(hlsSrc);&amp;#xA;            hls.attachMedia(video);&amp;#xA;            hls.on(Hls.Events.MANIFEST_PARSED, () =&gt; {&amp;#xA;                video.play();&amp;#xA;            });&amp;#xA;        } else if (isDashSupported()) {&amp;#xA;            // Use DASH for playback&amp;#xA;            const player = dashjs.MediaPlayer().create();&amp;#xA;            player.initialize(video, dashSrc, true);&amp;#xA;            player.updateSettings({&amp;#xA;                streaming: {&amp;#xA;                    lowLatencyEnabled: true, // Enable low-latency mode&amp;#xA;                    liveDelay: 1, // Set live delay in seconds, equal to 3 times the segment duration&amp;#xA;                    liveCatchUpPlaybackRate: 1.2, // Playback rate for catching up when behind the live edge&amp;#xA;                    liveCatchUpMinDrift: 0.5, // Minimum drift from live edge before initiating catch-up (in seconds)&amp;#xA;                    bufferTimeAtTopQuality: 3, // Maximum buffer length in seconds&amp;#xA;                    bufferToKeep: 0, // Duration of the back buffer in seconds (disable back buffer)&amp;#xA;                }&amp;#xA;            });&amp;#xA;        } else {&amp;#xA;            console.error(&amp;#x27;Neither HLS nor DASH playback is supported in this browser.&amp;#x27;);&amp;#xA;        }&amp;#xA;    &lt;/script&gt;&#xA;&#xA;&#xA;

    &#xA;

    I hope to reduce the latency to 1 second.

    &#xA;

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