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Autres articles (19)

  • 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 (...)

  • 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 (...)

  • Les vidéos

    21 avril 2011, par

    Comme les documents de type "audio", Mediaspip affiche dans la mesure du possible les vidéos grâce à la balise html5 .
    Un des inconvénients de cette balise est qu’elle n’est pas reconnue correctement par certains navigateurs (Internet Explorer pour ne pas le nommer) et que chaque navigateur ne gère en natif que certains formats de vidéos.
    Son avantage principal quant à lui est de bénéficier de la prise en charge native de vidéos dans les navigateur et donc de se passer de l’utilisation de Flash et (...)

Sur d’autres sites (3347)

  • Cannot install Libtool library used but `LIBTOOL' is undefined trying to install ffmpeg

    23 décembre 2014, par user1503606

    I am trying to install ffmpeg on centos following this tutorial.

    http://ffmpeg.org/trac/ffmpeg/wiki/CentosCompilationGuide

    but when i run.

    cd ~/ffmpeg_sources
    
git clone --depth 1 git://github.com/mstorsjo/fdk-aac.git
    
cd fdk-aac
    
autoreconf -fiv
    
./configure --prefix="$HOME/ffmpeg_build" --disable-shared
    
make
    
make install
    
make distclean

    I get the following error.

    cd . && /bin/sh /root/ffmpeg_sources/fdk-aac/missing --run automake-1.9 --foreign
    
Makefile.am: C objects in subdir but `AM_PROG_CC_C_O' not in `configure.ac'
    
make: *** [Makefile.in] Error 1
    
[root@worldnewstranslate fdk-aac]# make install
    
 cd . && /bin/sh /root/ffmpeg_sources/fdk-aac/missing --run automake-1.9 --foreign
    
Makefile.am: C objects in subdir but `AM_PROG_CC_C_O' not in `configure.ac'
    
make: *** [Makefile.in] Error 1

    I cannot get it to work for the life of me any help please why i maybe getting these errors.

    Thanks

  • Make blurred background faster with ffmpeg

    26 septembre 2022, par Peter Czask

    I have a vertical videos which I'll like to make them horizontal 1920x1080 with blurred background.

    


    I do it with this command :

    


    ffmpeg -i input.mp4 -vf 'split[original][copy];[copy]scale=ih*16/9:-1,crop=h=iw*9/16,gblur=sigma=20[blurred];[blurred][original]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2'  output.mp4 


    


    which that code I'm satisfied with the result, except that it takes very very long time to produce it. Is there any way to speed it up ? I noticed that the blurred part on the background uses half of the overlay video (non blurred), I'll like to blurry just with the edge (or 10 pixels) of the non blurred video (if this makes the encoding faster)...

    


  • avformat_write_header() changes my stream's time_base

    12 avril 2023, par greken

    I have a high framerate camera which can capture >2000 fps. My plan was to assign actual capture timestamps with µs resolution to the frames and encode with H.264 in a matroska file.

    


    So I set the time_base of both the AVStream and the AVCodecContext to {1, 1'000'000}. But after calling avformat_write_header(avFormatContext, nullptr) I notice that the stream's time_base is {1, 1'000}. Now, since my framerate is double this resolution, I get identical consecutive timestamps and half my frames get lost when I extract them from the video file.

    


    Does anyone have an idea why this is happening and what I can do about it ? Preferably in a way that preserves the correct timestamps.

    


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