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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

  • 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" ;

  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

Sur d’autres sites (9289)

  • avformat/dashdec : Ensure strings are zero-terminated

    2 mars 2021, par Andreas Rheinhardt
    avformat/dashdec : Ensure strings are zero-terminated

    strncpy only ensures that one does not write beyond the end of the
    
destination buffer ; in case of truncation it does not zero-terminate
    
the destination buffer. This makes using it the way it is now in the
    
DASH demuxer dangerous. So use av_strlcpy instead.
    

    Also don't write anything if there is no id : The buffer has already been
    
zeroed initially.
    

    The DASH testset from the Universität Klagenfurt contains samples with
    
ids that are too long. E.g.
    
http://ftp.itec.aau.at/datasets/DASHDataset2014/TearsOfSteel/1sec/TearsOfSteel_1s_simple_2014_05_09.mpd
    

    Reviewed-by : Steven Liu <lq@chinaffmpeg.org>
    
Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
    • [DH] libavformat/dashdec.c

  • Why are there multiple timescale specified in a MP4/AVC container file ?

    24 juin 2021, par Lexx32117

    I am currently parsing a MPEG-DASH stream initialization segment (generated by FFMPEG) and I noticed that the timescale is specified at multiple different places in my file :

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    • In the movie header box (mvhd) : 1000

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    • In the media header box of my video track (mdhd) : 15360

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    • In the AVC Configuration box (avcC) more precisely in the VUI section of the sequence parameter set NAL unit : 60

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    Why is it specified in so many different places ? Why do they have different values ? Is there a hierarchy in these value ? For example does 60 overrides 15360 and 15360 overrides 1000 ?

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    Here's the command I used to generate the file I am looking at :

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    ffmpeg -f v4l2 -pixel_format yuyv422 -vcodec rawvideo -framerate 30 -video_size 640x360 -i /dev/video0 \&#xA;        -f dash -remove_at_exit false -use_template true -use_timeline true -streaming true -window_size 5 -extra_window_size 5 -seg_duration 5 -vcodec libx264 -b:v 1M -maxrate 1M -bufsize 2M  -pix_fmt yuv420p -r 30 -s 640x360 -aspect 16:9 /var/www/html/media/live.mpd&#xA;

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  • How to handle errors during downloading (using videomanifest) video and make it more robust

    5 mai 2023, par Wakan Tanka

    I'm using ffmpeg to download videos from streaming site following way :

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    ffmpeg.exe -i videomanifest -codec copy video.mp4 &#xA;

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    This works, but it has some drawbacks. The problem is that sometimes my (or maybe error on server side etc.) internet connection fails, and I'm forced to restart the whole download again. I would like to make this process more robust. It would be great if ffmpeg can continuously split video to several smaller files during the download and if download will fail then ffmpeg will continue (or maybe skip) from broken part. After downloading all parts I will concat them manually, this is no problem. Please treat above text just like an example, any other solution which will make downloading process more robust is welcomed. Is this possible with ffmpeg ?

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    Here is example of videomanifest (this is not a fully functional file, important url parts were deleted due to privacy, so please treat it as an example for demonstration purposes)

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    <mpd type="static" maxsegmentduration="PT5.000S" profiles="urn:mpeg:dash:profile:isoff-live:2011" mediapresentationduration="PT0H0M4961.472S" minbuffertime="PT4.500S" xmlns="urn:mpeg:DASH:schema:MPD:2011">&#xA;  <baseurl>https://........................</baseurl>&#xA;  <period>&#xA;    <adaptationset contenttype="audio" mimetype="audio/mp4" segmentalignment="true" bitstreamswitching="true" codecs="mp4a.40.2">&#xA;      <contentprotection schemeiduri="urn:mpeg:dash:sea:2012">&#xA;        &#xA;        &#xA;        &#xA;      </contentprotection>&#xA;      <label>EnhancedAudio</label>&#xA;      <segmenttemplate timescale="44100" initialization="videotranscode?provider=Spo&amp;amp;docId=https%3a%2...................">&#xA;        <segmenttimeline>&#xA;          <s d="221184" r="988"></s>&#xA;          <s d="49939"></s>&#xA;        </segmenttimeline>&#xA;      </segmenttemplate>&#xA;      <representation audiosamplingrate="44100" bandwidth="128000" codecs="mp4a.40.2"></representation>&#xA;      <representation audiosamplingrate="44100" bandwidth="192000" codecs="mp4a.40.2"></representation>&#xA;    </adaptationset>&#xA;    <adaptationset contenttype="audio" mimetype="audio/mp4" segmentalignment="true" bitstreamswitching="true" codecs="mp4a.40.2">&#xA;      <contentprotection schemeiduri="urn:mpeg:dash:sea:2012">&#xA;        &#xA;        &#xA;        &#xA;      </contentprotection>&#xA;      <label>OriginalAudio</label>&#xA;      <segmenttemplate timescale="44100" initialization="videotranscode?provider=Spo&amp;amp;docId=https%3a%2f%2fstu">&#xA;        <segmenttimeline>&#xA;          <s d="221184" r="988"></s>&#xA;          <s d="49939"></s>&#xA;        </segmenttimeline>&#xA;      </segmenttemplate>&#xA;      <representation audiosamplingrate="44100" bandwidth="128000" codecs="mp4a.40.2"></representation>&#xA;      <representation audiosamplingrate="44100" bandwidth="192000" codecs="mp4a.40.2"></representation>&#xA;    </adaptationset>&#xA;    <adaptationset contenttype="video" mimetype="video/mp4" segmentalignment="true" bitstreamswitching="true" maxframerate="82690000/5512747" maxwidth="1920" maxheight="1080" codecs="avc1.4d0028">&#xA;      <contentprotection schemeiduri="urn:mpeg:dash:sea:2012">&#xA;        &#xA;        &#xA;        &#xA;      </contentprotection>&#xA;      <segmenttemplate timescale="15000" initialization="videotranscode?provider=Spo&amp;amp;docId=https............">&#xA;        <segmenttimeline>&#xA;          <s d="74999" r="991"></s>&#xA;          <s d="22080"></s>&#xA;        </segmenttimeline>&#xA;      </segmenttemplate>&#xA;      <representation width="426" height="240" framerate="82690000/5512747" bandwidth="144000" codecs="avc1.4d401e"></representation>&#xA;      <representation width="852" height="480" framerate="82690000/5512747" bandwidth="480000" codecs="avc1.4d001f"></representation>&#xA;      <representation width="1280" height="720" framerate="82690000/5512747" bandwidth="1081600" codecs="avc1.4d001f"></representation>&#xA;      <representation width="1920" height="1080" framerate="82690000/5512747" bandwidth="2428800" codecs="avc1.4d0028"></representation>&#xA;    </adaptationset>&#xA;  </period>&#xA;</mpd>&#xA;

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