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Médias (91)

Autres articles (35)

  • Support de tous types de médias

    10 avril 2011

    Contrairement à beaucoup de logiciels et autres plate-formes modernes de partage de documents, MediaSPIP a l’ambition de gérer un maximum de formats de documents différents qu’ils soient de type : images (png, gif, jpg, bmp et autres...) ; audio (MP3, Ogg, Wav et autres...) ; vidéo (Avi, MP4, Ogv, mpg, mov, wmv et autres...) ; contenu textuel, code ou autres (open office, microsoft office (tableur, présentation), web (html, css), LaTeX, Google Earth) (...)

  • Supporting all media types

    13 avril 2011, par

    Unlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)

  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
    Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
    Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
    Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
    All uploaded files are stored online in their original format, so you can (...)

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  • avformat/mov : Enable stream parsing for VP9.

    7 septembre 2016, par Matthew Gregan
    avformat/mov : Enable stream parsing for VP9.

    MP4 media containing VP9 using superframes (such as
    
https://github.com/Netflix/vp9-dash/raw/master/DASH-Samples/Fountain_2997_0560kbps_640x480_4x3PAR.ivf_DashUnencrypted.ismv)
    
does not decode correctly with the built-in VP9 decoder because
    
superframes are passed to the decoder whole rather than split into
    
individual frames.
    

    Signed-off-by : Matthew Gregan <kinetik@flim.org>
    • [DH] libavformat/mov.c

  • How to not add AdaptationSet for audio if audio stream is not present in input file

    13 juin 2019, par Saurabh

    I am using ffmpeg-dash to create mpd files. I am using following command to generate the same :

    ffmpeg -i input/video.mov \
    
        -map 0:v:0 -map 0:v:0 -map 0:v:0 -map 0:a\?:0 \
    
        -b:v:0 350k -c:v:0 libx264 -filter:v:0 "scale=320:-1" \
    
        -b:v:1 1000k -c:v:1 libx264 -filter:v:1 "scale=640:-1" \
    
        -b:v:2 3000k -c:v:2 libx264 -filter:v:2 "scale=1280:-1" \
    
        -use_timeline 1 -use_template 1 -window_size 6  -adaptation_sets "id=0,streams=v id=1,streams=a"  \
    
        -seg_duration 2 -threads 16 -hls_playlist true -f dash output/ffmpeg/output.mpd

    This works with video which has audio streams, but for the case there is no audio stream in the video file, I get empty entry for audio in mpd files like following, which is not valid and fails while playing in Exo Player in Android.

    <adaptationset contenttype="audio" segmentalignment="true" bitstreamswitching="true">
    
</adaptationset>

    I tried adding ? in option adaptation_sets like : id=0,streams=v id=1,streams=a?, however that also adds above line.

    One solution is to run different commands for different videos by first checking whether there is audio stream or not, but would be better if there is some option which add audio adaptationSet only if audio stream is present in the input file.

  • webm_dash_manifest : Add option to specify bandwidth

    12 avril 2017, par Vignesh Venkatasubramanian
    webm_dash_manifest : Add option to specify bandwidth

    Add an option to webm_dash_manifest demuxer to specify a value for
    
"bandwidth" field in the DASH manifest. The value is then used by
    
the muxer. Fixes an existing FIXME in the code.
    

    Signed-off-by : Vignesh Venkatasubramanian <vigneshv@google.com>
    
Signed-off-by : James Zern <jzern@google.com>
    • [DH] libavformat/matroskadec.c
    • [DH] libavformat/webmdashenc.c
    • [DH] tests/fate/vpx.mak
    • [DH] tests/ref/fate/webm-dash-manifest-live-bandwidth

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