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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 (...)

  • Le plugin : Podcasts.

    14 juillet 2010, par

    Le problème du podcasting est à nouveau un problème révélateur de la normalisation des transports de données sur Internet.
    Deux formats intéressants existent : Celui développé par Apple, très axé sur l’utilisation d’iTunes dont la SPEC est ici ; Le format "Media RSS Module" qui est plus "libre" notamment soutenu par Yahoo et le logiciel Miro ;
    Types de fichiers supportés dans les flux
    Le format d’Apple n’autorise que les formats suivants dans ses flux : .mp3 audio/mpeg .m4a audio/x-m4a .mp4 (...)

  • Création définitive du canal

    12 mars 2010, par

    Lorsque votre demande est validée, vous pouvez alors procéder à la création proprement dite du canal. Chaque canal est un site à part entière placé sous votre responsabilité. Les administrateurs de la plateforme n’y ont aucun accès.
    A la validation, vous recevez un email vous invitant donc à créer votre canal.
    Pour ce faire il vous suffit de vous rendre à son adresse, dans notre exemple "http://votre_sous_domaine.mediaspip.net".
    A ce moment là un mot de passe vous est demandé, il vous suffit d’y (...)

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  • MP4 to DASH (bash script)

    18 mars 2019, par Francesco Galgani

    I have a web site in which users can upload video files. I want to stream all of them using DASH to obtain an adaptive bitrate streaming. So I wrote a bash script (to run by cron) that converts all mp4 files to DASH, but it doesn’t work properly : what is wrong ?

    For example, using the following script, I obtained :
    https://www.informatica-libera.net/dash_faq/stream.mpd

    It validates, but it doesn’t play. I tested it on :
    http://dash-mse-test.appspot.com/dash-player.html?url=https%3A%2F%2Fwww.informatica-libera.net%2Fdash_faq%2Fstream.mpd&autoplay=on&adapt=auto&flavor=

    Thank you for any help.
    The code :

    #!/bin/bash
    

    
# THIS SCRIPT CONVERTS EVERY MP4 (IN THE CURRENT FOLDER AND SUBFOLDER)
    
# TO A MULTI-BITRATE VIDEO IN MP4-DASH
    
# For each file "videoname.mp4" it creates a folder "dash_videoname" 
    
# containing a dash manifest file "stream.mpd" and subfolders containing 
    
# video segments.
    

    
# mp4dash documentation and download: https://www.bento4.com/developers/dash/
    

    
MYDIR=$(dirname $(readlink -f ${BASH_SOURCE[0]}))
    
SAVEDIR=$(pwd)
    

    
# Check programs
    
if [ -z "$(which ffmpeg)" ]; then
    
    echo "Error: ffmpeg is not installed"
    
    exit 1
    
fi
    

    
if [ -z "$(which mp4dash)" ]; then
    
    echo "Error: mp4dash is not installed"
    
    exit 1
    
fi
    

    
cd "$MYDIR"
    

    
TARGET_FILES=$(find ./ -type f -name "*.mp4")
    
for f in $TARGET_FILES
    
do
    
  f=$(basename "$f") # fullname of the file
    
  f="${f%.*}" # name without extension
    

    
  if [ ! -d "dash_${f}" ]; then
    
    echo "Converting \"$f\" to multi-bitrate video in MPEG-DASH"
    

    
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 1500k -vf "scale=-2:720" -f mp4 -pass 1 -y /dev/null
    
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 1500k -vf "scale=-2:720" -f mp4 -pass 2 "${f}_1500.mp4"
    

    
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 800k -vf "scale=-2:540" -f mp4 -pass 1 -y /dev/null
    
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 800k -vf "scale=-2:540" -f mp4 -pass 2 "${f}_800.mp4"
    

    
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 400k -vf "scale=-2:360" -f mp4 -pass 1 -y /dev/null
    
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 400k -vf "scale=-2:360" -f mp4 -pass 2 "${f}_400.mp4"
    

    
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 200k -vf "scale=-2:180" -f mp4 -pass 1 -y /dev/null
    
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 200k -vf "scale=-2:180" -f mp4 -pass 2 "${f}_200.mp4"
    

    
    rm -f ffmpeg*log*
    

    
    mp4fragment "${f}_1500.mp4" "${f}_1500_fragmented.mp4"
    
    mp4fragment "${f}_800.mp4" "${f}_800_fragmented.mp4"
    
    mp4fragment "${f}_400.mp4" "${f}_400_fragmented.mp4"
    
    mp4fragment "${f}_200.mp4" "${f}_200_fragmented.mp4"
    

    
    rm -f "${f}_1500.mp4" "${f}_800.mp4" "${f}_400.mp4" "${f}_200.mp4"
    

    
    mp4dash -v -o "dash_${f}" "${f}_1500_fragmented.mp4" "${f}_800_fragmented.mp4" "${f}_400_fragmented.mp4" "${f}_200_fragmented.mp4"
    

    
    rm -f "${f}_1500_fragmented.mp4" "${f}_800_fragmented.mp4" "${f}_400_fragmented.mp4" "${f}_200_fragmented.mp4"
    

    
    fi
    

    
done
    

    
cd "$SAVEDIR"

  • MP4 to DASH (bash script)

    13 mars 2017, par francesco.galgani

    I have a web site in which users can upload video files. I want to stream all of them using DASH to obtain an adaptive bitrate streaming. So I wrote a bash script (to run by cron) that converts all mp4 files to DASH, but it doesn’t work properly : what is wrong ?

    For example, using the following script, I obtained :
    https://www.informatica-libera.net/dash_faq/stream.mpd

    It validates, but it doesn’t play. I tested it on :
    http://dash-mse-test.appspot.com/dash-player.html?url=https%3A%2F%2Fwww.informatica-libera.net%2Fdash_faq%2Fstream.mpd&autoplay=on&adapt=auto&flavor=

    Thank you for any help.
    The code :

    #!/bin/bash
    

    
# THIS SCRIPT CONVERTS EVERY MP4 (IN THE CURRENT FOLDER AND SUBFOLDER)
    
# TO A MULTI-BITRATE VIDEO IN MP4-DASH
    
# For each file "videoname.mp4" it creates a folder "dash_videoname" 
    
# containing a dash manifest file "stream.mpd" and subfolders containing 
    
# video segments.
    

    
# mp4dash documentation and download: https://www.bento4.com/developers/dash/
    

    
MYDIR=$(dirname $(readlink -f ${BASH_SOURCE[0]}))
    
SAVEDIR=$(pwd)
    

    
# Check programs
    
if [ -z "$(which ffmpeg)" ]; then
    
    echo "Error: ffmpeg is not installed"
    
    exit 1
    
fi
    

    
if [ -z "$(which mp4dash)" ]; then
    
    echo "Error: mp4dash is not installed"
    
    exit 1
    
fi
    

    
cd "$MYDIR"
    

    
TARGET_FILES=$(find ./ -type f -name "*.mp4")
    
for f in $TARGET_FILES
    
do
    
  f=$(basename "$f") # fullname of the file
    
  f="${f%.*}" # name without extension
    

    
  if [ ! -d "dash_${f}" ]; then
    
    echo "Converting \"$f\" to multi-bitrate video in MPEG-DASH"
    

    
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 1500k -vf "scale=-2:720" -f mp4 -pass 1 -y /dev/null
    
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 1500k -vf "scale=-2:720" -f mp4 -pass 2 "${f}_1500.mp4"
    

    
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 800k -vf "scale=-2:540" -f mp4 -pass 1 -y /dev/null
    
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 800k -vf "scale=-2:540" -f mp4 -pass 2 "${f}_800.mp4"
    

    
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 400k -vf "scale=-2:360" -f mp4 -pass 1 -y /dev/null
    
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 400k -vf "scale=-2:360" -f mp4 -pass 2 "${f}_400.mp4"
    

    
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 200k -vf "scale=-2:180" -f mp4 -pass 1 -y /dev/null
    
    ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 200k -vf "scale=-2:180" -f mp4 -pass 2 "${f}_200.mp4"
    

    
    rm -f ffmpeg*log*
    

    
    mp4fragment "${f}_1500.mp4" "${f}_1500_fragmented.mp4"
    
    mp4fragment "${f}_800.mp4" "${f}_800_fragmented.mp4"
    
    mp4fragment "${f}_400.mp4" "${f}_400_fragmented.mp4"
    
    mp4fragment "${f}_200.mp4" "${f}_200_fragmented.mp4"
    

    
    rm -f "${f}_1500.mp4" "${f}_800.mp4" "${f}_400.mp4" "${f}_200.mp4"
    

    
    mp4dash -v -o "dash_${f}" "${f}_1500_fragmented.mp4" "${f}_800_fragmented.mp4" "${f}_400_fragmented.mp4" "${f}_200_fragmented.mp4"
    

    
    rm -f "${f}_1500_fragmented.mp4" "${f}_800_fragmented.mp4" "${f}_400_fragmented.mp4" "${f}_200_fragmented.mp4"
    

    
    fi
    

    
done
    

    
cd "$SAVEDIR"

  • How can I convert a video from a png sequence to a webm with an alpha channel. Tried it with ffmpeg and it hasn't worked

    30 octobre 2016, par user6410747

    OK so I am actually asking for a friend who said they needed help with there python code. I know absolutely nothing about Python. I do all my coding in either c++ or Java.

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