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Autres articles (45)

  • Contribute to a better visual interface

    13 avril 2011

    MediaSPIP is based on a system of themes and templates. Templates define the placement of information on the page, and can be adapted to a wide range of uses. Themes define the overall graphic appearance of the site.
    Anyone can submit a new graphic theme or template and make it available to the MediaSPIP community.

  • Les notifications de la ferme

    1er décembre 2010, par

    Afin d’assurer une gestion correcte de la ferme, il est nécessaire de notifier plusieurs choses lors d’actions spécifiques à la fois à l’utilisateur mais également à l’ensemble des administrateurs de la ferme.
    Les notifications de changement de statut
    Lors d’un changement de statut d’une instance, l’ensemble des administrateurs de la ferme doivent être notifiés de cette modification ainsi que l’utilisateur administrateur de l’instance.
    À la demande d’un canal
    Passage au statut "publie"
    Passage au (...)

  • Supporting all media types

    13 avril 2011, par

    Unlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)

Sur d’autres sites (7047)

  • libx264 performances on iOS

    8 mai 2012, par Gilad

    I was wondering whether someone has some experience using libx264 on iPhone.

    How does it perform ? What framerate can I expect ? Will it work for simultaneous encoding & decoding (video call) or the CPU can't handle it ? I'm mainly interested with iPhone 4 and above (iPhone4/iPad 2)

    Are there any precompiled universal binaries I can use ?

  • FFmpeg How disable video output ?

    29 août 2022, par NoonanRosenblum

    With ffmpeg 4.3.1, I want to use the "blackframe" filter.

    


    This filter outputs text results in the console each time a black frame is detected in the input video.

    


    ffmpeg -i Input.avi -filter_complex "blackframe" Output.mkv
> [Parsed_blackframe_1 @ 0x7ff48c607a80] frame:206 pblack:100 ...


    


    I do not need to create the Output.mkv video, as console result is enough.

    


    Unfortunately I am not able to find in the documentation how disable output video and still run the filter. From the main options section https://www.ffmpeg.org/ffmpeg.html#Main-options and examples elsewhere I tried :

    


      

    • -f null

      • 


    • or -y NULoption in the -pass option example of the doc

      • 


    


    But none of these commands works :

    


    ffmpeg -i Video.avi -filter_complex "black frame" -f null
> Filter blackframe has an unconnected output

ffmpeg -i Video.avi -filter_complex "black frame" -y NUL
> [NULL @ 0x7ffbe7026200] Unable to find a suitable output format for 'NUL'
> NUL: Invalid argument


    


    How can I disable video output ?

    


    Where is it explain in the documentation ?

    


  • ffmpeg convert white color to alpha

    11 janvier 2021, par tony

    Hello i took a picture with my camera :a drawing of a square frame on a white paper ; i'm trying to convert the white to transparent and keep the black color frame.

    


    So i started making 1 palette with only 2 colors to make the colors uniform and 1 palette to add the transparency

    


    ffmpeg -f lavfi -i "color=color=white:100x100" -f lavfi -i "color=color=black:100x100" -filter_complex "[0][1]hstack" -frames:v 1 blackwhite.png`
ffmpeg -i blackwhite.png -filter_complex "[0]split[a][b];[a]palettegen[pal1];[b]palettegen=reserve_transparent=on:transparency_color=white[pal2]" -map [pal1] palette1.png -map [pal2] palette2.png


    


    then i mapped the image png of the frame to convert the white to transparent and overlayed the result to a red background

    


    ffmpeg -i image.png -i palette1.png -i palette2.png -i background.png -filter_complex "[0:v][1:v]paletteuse=dither=bayer[a],[a]split[a1][a2];[a1][2:v]paletteuse=alpha_threshold=128[c];[3:v][c]overlay[d]" -map [a2] -c:v png out.png -map [d] -c:v png out1.png


    


    the png mapped to the first palette (as a test) comes as it should be, pure black and white,the second comes with no transparency at all and covers the background
what am i doing wrong ?

    


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