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Autres articles (61)

  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
    autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs

  • 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.

  • 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.

Sur d’autres sites (7712)

  • Append A Frame (PNG) FFMPEG To existing video, Make changes all the video - libx264

    7 décembre 2022, par agh bagherian

    I want to append a frame to existing video by using ffmpeg.

    


    p0.png, p1.png and p2.png (3 frames)

    


    by this command ffmpeg generate first video :

    


    ffmpeg -framerate 4 -f image2 -s 1280x720 -i p%d.png -vcodec libx264 -b 80k test1.mp4

    


    Then i want to append a frame to last of video, but total video in HEX-View will be changed. I use this command to append :

    


    ffmpeg -framerate 4 -f image2 -s 1280x720 -t 1 -i new_pic.png -i test1.mp4 -vcodec libx264 -b 80k test2.mp4

    


    Please see image below :

    


    Please see this screen shot

    


    But i want only append some hex code to end of first video....

    


    Please help me. Thanks

    


    I tried many commands. I did not get any results

    


  • Adding transparency to a video from black and white (and gray) alpha information video images

    3 juillet 2018, par Jan F.

    I’d like to create a video with transparency (and semi transparency) in android. The images of the source video are split into two images, the top one with color information (looks like the normal video image), the bottom one with alpha information (the same shapes but only in black and white and gray, black means transparent).

    This is the solution for iOS :
    https://medium.com/@quentinfasquel/ios-transparent-video-with-coreimage-52cfb2544d54

    What would be the best way to to this in android ?

    Can this be solved with javacv, FFmpegFrameGrabber, FFmpegFrameFilter etc.?

    Or better with OpenGL ES and shaders ?

    Are there any samples ?

    Thanks !

  • SVT-AV1 : After encoding the video seeking is very bad in any video player (even HTML5)

    18 juin 2020, par Viktor Machnik

    i am using SVT-AV1 and FFMPEG to encode Videos into the AV1 video and opus audio codec (.webm), it works fine, except that the video seeking do not work really (extremly bad). When i seek, the CPU useage jumps up and it takes up to minutes until the seeking process finishes.

    



    Here is how i encode the videos :

    



      

    1. Convert any video into yuv : ffmpeg -i  -preset veryslow -level 6.2 .yuv

      2. 


    2. First AV1 run svt-av1 -i '.yuv' -w  -h  --fps  --rc 0 -q 30 --preset 8 -b '.\output1.ivf' --output-stat-file '.\stat_file.stat' --keyint 1 --enable-restoration-filtering 1

      3. 


    3. Second AV1 run svt-av1 -i '.yuv' -w  -h  --fps  --rc 0 -q 30 --preset 3 -b '.\output.ivf' --input-stat-file '.\stat_file.stat' --keyint 1 --enable-restoration-filtering 1

      4. 


    4. Get source video audio in opus codec ffmpeg -i  -c:a libopus -vn -preset veryslow -level 6.2 output.ogg

      5. 


    5. Get final .webm video ffmpeg -i output.ivf -i output.ogg -c copy output.webm

      6. 


    



    I have allready tryed to play with the —keyin option, also just letting it away and use the encoder default, but the results are always the same. (--keyin 1 seems to work better than without this option, but also very very bad)

    



    What am i doing wrong ?

    



    Extras : I am using Windows 10 with downloaded version of SVT-AV1 and FFMPEG (I just renamed the SVT-AV1 Encoder .exe file to be svt-av1.exe). Used CPU is Ryzen 9 3900X

    


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