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    Mediaspip core
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    Puis-je poster des contenus à partir d’une tablette Ipad ?
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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 (...)

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  • Using ffmpeg to capture frames at intervals from a video

    25 octobre 2011, par TheShaggyBeard

    So here is what I am trying to do - I want to automate creating animated gif previews from a video file (in this case I know they will always be a specific format). Here is what I have :

    echo 'Make a folder named "filenamemp4"'
    
folderName=$(find . -type f -name "*.mp4" | grep -o [[:alnum:]] | tr -d '\n' | cat)
    

    
echo 'Grab the frame rate and total number of frames and put them into xaa and xab'
    
qtinfo asa.mp4 | awk 'NR = 1 { print $2 }' | grep -o "^[0-9]*" | split -l 1
    

    
echo 'Assign values to variable'
    
frameRate=$(cat xaa)
    
frameTotal=$(cat xab)
    
videoLength=$(expr $frameTotal / $frameRate)
    

    
echo 'Take a screenshot at 10% intervals - this is the part that gives me a bitrate error.  It says that the -r option has an invalid input being 1 / value of videoLength' 
    
ffmpeg -i asa.mp4 -y -ss $videoLength -an -sameq -f image2 -s 'qcif' -r $(expr 1/$videoLength) preview%02d.jpg
    

    
echo 'Take the jpgs and mash them into an animated gif'
    
convert -delay 50 -loop 10 preview*.jpg preview.gif
    

    
echo 'Move the gif to the specified folder'
    
mv preview.gif $folderName/preview.gif
    

    
echo 'Clean Up'
    
find . -type f -name "*.jpg" -exec rm -rf {} \;

    So perhaps there is a better way of doing this, or I am understanding how to use the -r option of ffmpeg wrong. In the tutorial I read on ffmpeg for a similar scenario, they used -r 1/5 to produce frames with a 5 second interval. My assumption is that for the desired interval you want, you just slap it in the denominator for the -r option.

  • avconv : make -frames work for all types of streams, not just video.

    1er janvier 2012, par Anton Khirnov

    avconv : make -frames work for all types of streams, not just video.

  • avconv : make -frames work for all types of streams, not just video.

    1er janvier 2012, par Anton Khirnov

    avconv : make -frames work for all types of streams, not just video.

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