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Autres articles (21)

  • 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 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

  • 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 (4821)

  • How to get the information of bit-rate from YouTube videos ?

    21 janvier, par Ashutosh Singla

    I was using YouTube videos for my test and I was wondering how can I get the information of bit-rate of the played video ?

    



    I used 2 methods to know the information about the bit-rate but didn't get any information.

    



    1. Right-click on a video and choose "Stats for nerds".
2. ffmpeg -i input_video -f ffmetadata metadata.txt


    



    I don't know if by doing the right click on the video and then properties, then details would give me the correct way of showing the bit-rate.

    



    Any suggestions ?

    


  • Converting 6 audio channels to 2 in ffmpeg

    12 juin 2013, par k1lljoy

    Im doing a 2 pass encode on the uploads to my site.

    Unfortunately when a user uploads a 6 audio channel .mkv files (5.1 surround), ffmpeg spits out the following error :

    Resampling with input channels greater than 2 unsupported.

    Im running the latest version of ffmpeg. Doing -ac 6 instead of the usual - ac 2 proceeds with the encoding, but it just creates a larger file with useless data, as well as creates another step in the already long file processing script, and I'd rather avoid modifying the conversion command.

    Is there anything I can do to make -ac 2 actually work ?

  • How can I simply replace the colors using the color masks on this image and then save it ? With RGBA channels as example

    31 août 2020, par karl-police

    So I got this GIF here :

    


    


    As you can see, it has Red, Green and Blue in it. And it also has a full transparency in it. This was composed together with FFMPEG out of images that looked exactly like that.

    


     

    


    Then, with FFMPEG I "decomposed" the RGB and Alpha channels using the filter "extractplanes".

    


    The gallery of that, in correct order starting from up to down, can be found here :

    


    https://imgur.com/a/WN0aGuW

    


    I am not sure if this actually helps me or if I'm supposed to decompose them. Because apperantly now, after decomposing them, I'm supposed to modify them, but I'm not really sure how. It's like how do I modify the red channel that only has black and white, so all at the end, will match to the specified HEX color that I want it to be to.

    


     

    


    Now, my question is. How do I exactly make the color changing happen ? Can I do this simply with JavaScript ? Is it possible to do with FFMPEG, if possible without ImageMagicks ? Maybe a programming language where not much installation is needed to do that ?

    


    What I understood is that. These channels basically contain values from 0 to 255 with black and white. I think the "brightness" is that what 0 and 255. So something inbetween, would be like grey.

    


    So basically, like we do (255,0,0) for red. In these channels, if I want red somewhere I need to put one fully white pixel on the red channel and on all the other channels, there has to be a fully black pixel.

    


    That's the concept. Now is the question, how can I do this ?

    


     

    


    At the end I want to make it look like the colors this one has, as example :

    


    


    This is from a game. So basically that's how it looks like in the game. And the game files only use these RGBA template sprites.

    


     

    


    I asked a similar question here : How to change colors of an image using RGBA and more channels independently of their color

    


    But somehow, I might didn't seem to explain it that well.

    


     

    


    I made a thing here to test around with things. I guess that's nearly close, but the lines are kinda weird. jsfiddle.net/qsgazubk

    


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