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Autres articles (3)

  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

  • Publier sur MédiaSpip

    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
    Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir

  • Selection of projects using MediaSPIP

    2 mai 2011, par

    The examples below are representative elements of MediaSPIP specific uses for specific projects.
    MediaSPIP farm @ Infini
    The non profit organizationInfini develops hospitality activities, internet access point, training, realizing innovative projects in the field of information and communication technologies and Communication, and hosting of websites. It plays a unique and prominent role in the Brest (France) area, at the national level, among the half-dozen such association. Its members (...)

Sur d’autres sites (3029)

  • ffmpeg : jpeg-images with different resolution -> video sequence ; using padding instead of scaling [on hold]

    3 septembre 2013, par user2742503

    I am currently struggling with the following problem using ffmpeg : I have a bunch of jpg-files with different resolution (say, one is 320x240, one is 800x600 etc) and want to create an avi-file using mjpeg as a video codec withn a output-video resolution of 800x600. The images itself should not be scaled in any way, that means : What I want to achieve is to just place the image in the center and fill the remaining space with white or black instead of scaling up the smaller images to the target resolution.

    So far I have used

    ffmpeg -f image2 -r 1 -i image_%04d.jpg -vcodec mjpeg -s 1920x1080 -qscale 2 -r 25 output2.avi

    or

    ffmpeg -f image2 -r 1 -i image_%04d.jpg -vcodec mjpeg -vf scale=1920:1080 -qscale 2 -r 25 output2.avi

    in case of scaling to HD resolution.

    Would be very thankful for any support on that !

    Thank you in advance !

  • avfilter/vf_psnr : Prevent integer overflow.

    21 septembre 2013, par Neil Birkbeck
    avfilter/vf_psnr : Prevent integer overflow.

    The 32-bit integer accumulator in MSE computation can overflow for 8-bit frame data.
    
(e.g., for 1080p white frame compared to a black frame can give sum of 255*255*1080*1920 > 2^32).
    

    Signed-off-by : Neil Birkbeck <neil.birkbeck@gmail.com>
    
Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
    • [DH] libavfilter/vf_psnr.c

  • Append video files of different width, height

    28 novembre 2013, par Jatin

    I am building an application where user can record a screencast. Integral part of application is that, one can pause recording and resume it later any time (the session is maintained on server side).

    So say when user starts recording the screen, the width and height is :1024*768. Using xuggler (java wrapper for ffmpeg), I am able to generate a video. But say later he is on a different system and wishes to resume screen cast, then resolution changes to 1080 * 720. At this stage, I record it seperately and then try merging two files. But because the width & height are not same, I get the below exception :

    16:38:03.916 [main] WARN com.xuggle.xuggler - Got error : picture is
    not of the same width as this Coder
    (../../../../../../../csrc/com/xuggle/xuggler/StreamCoder.cpp:1430)
    Exception in thread "main" java.lang.RuntimeException : failed to
    encode video

    What is the best way to solve this Issue. The user can be on screen with different width and height. How do I merge (or any other alternatives, probably append) video files of different width and height ?

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