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  • 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 (...)

  • 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 (...)

  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

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  • MP4 moof fragment headers

    23 juillet 2019, par Ariana

    I have a MP4 parser software that get’s a fragmented .mp4 video, parses the MOOV and fragment headers and streams it. I have generated a .mp4 file myself using FFMPEG and MP4Box/bento4, but the software has problems processing it.

    ffmpeg -i input.mp4 -g 25 -c:v libx264 -c:a copy out1.mp4
    

    
mp4fragment out1.mp4 --fragment-duration 1000 --track 'video' output.mp4

    Using the MP4 Explorer software, I noticed in my generated .mp4 file, for all moof.traf.trun, sample duration is set to 0, but in the Track Fragment Header box, it sets the default_sample_duration to 512. While in the another .mp4 file which works fine, there is no default_sample_duration field, but each individual sample has a duration of size 512. Looks like this might cause the problem. The right figure shows the working mp4, and the left one is my generated mp4.

    Is this an update in the newer versions of FFMPEG (or MP4Box or bento4) ? Is there any ways to force setting the sample duration in samples ?

    My .mp4 file

    The working .mp4 file

    enter image description here

  • movenc : Allow writing a DASH sidx atom at the start of files

    21 octobre 2014, par Martin Storsjö
    movenc : Allow writing a DASH sidx atom at the start of files

    This is mapped to the faststart flag (which in this case
    
perhaps should be called "shift and write index at the
    
start of the file"), which for fragmented files will
    
write a sidx index at the start.
    

    When segmenting DASH into files, there’s usually one sidx
    
at the start of each segment (although it’s not clear to me
    
whether that actually is necessary). When storing all of it
    
in one file, the MPD doesn’t necessarily need to describe
    
the individual segments, but the offsets of the fragments can be
    
fetched from one large sidx atom at the start of the file. This
    
allows creating files for the DASH ISO BMFF on-demand profile.
    

    Signed-off-by : Martin Storsjö <martin@martin.st>
    • [DH] libavformat/movenc.c
    • [DH] libavformat/movenc.h

  • avutil/avstring : add a "ALL" entry and the possibility to negate matches to av_match_...

    11 février 2016, par Michael Niedermayer
    avutil/avstring : add a "ALL" entry and the possibility to negate matches to av_match_name()

    This will extend the whitelist features to allow blacklisting individual protocols and to
    
explicitly force everything to be enabled.
    

    Reviewed-by : Stefano Sabatini <stefasab@gmail.com>
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavutil/avstring.c
    • [DH] libavutil/avstring.h
    • [DH] libavutil/version.h

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