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  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
    You may also (...)

  • Le plugin : Podcasts.

    14 juillet 2010, par

    Le problème du podcasting est à nouveau un problème révélateur de la normalisation des transports de données sur Internet.
    Deux formats intéressants existent : Celui développé par Apple, très axé sur l’utilisation d’iTunes dont la SPEC est ici ; Le format "Media RSS Module" qui est plus "libre" notamment soutenu par Yahoo et le logiciel Miro ;
    Types de fichiers supportés dans les flux
    Le format d’Apple n’autorise que les formats suivants dans ses flux : .mp3 audio/mpeg .m4a audio/x-m4a .mp4 (...)

Sur d’autres sites (4755)

  • Rendering pixel perfect subtitles for small videos

    23 octobre 2017, par forthrin

    I want to burn subtitles with a font as small as possible (yet readable) on top of a small size video, as shown on the first image. FFmpeg makes the font blurry for any font size tried (second image).

    ffmpeg -i in.jpg -vf "scale=160x128,subtitles=in.srt:force_style='OutlineColour=&H80000000,BorderStyle=3,Fontsize=15,Fontname=Silkscreen'" out.png

    Is there any way I can achieve pixel perfect subtitles with small fonts using FFmpeg or other readily available command line tools ? (The smallest font I’ve found is Silkscreen, though it’s ASCII only !)

    enter image description here
    enter image description here

  • Swscale color space convert interlaced frames ?

    29 mai 2012, par Nioreh

    I am writing an application that exports video that I have captured (PAL SDI). The original color space is uyvy (4:2:2). When I convert the frames with swscale to 4:2:0 and encode with avcodec I get color bleeding between the fields. I suspect this is from swscale not being aware of the frame being interlaced. Here is an example of a part of a bob-deinterlaced frame from my exported video showing one of the fields :

    color bleeding between fields

    As you can see, the color bleeds from the other field. How do I keep this from happening ? I have looked at the library and tried to find anything in swscale that tells it to respect the fields, but I haven't found anything.

    I store each field in seperate buffers, so I can process the fields individually before hand if that would help.

    Thankful for any help on this !

    Regards
    Carl

    Edit : Basically, what I want is to output PAL DV. I suspect swscale is able to somehow produce this type of interlaced 420, since ffmpeg (the application) can handle this (I think).

  • FFMPEG color to transparencyq

    5 septembre 2019, par Andrew L

    I am trying to convert a mp4 video with a completely uniform pink color to a mov file seuch that the pink color is transparent.

    I have run :

    ffmpeg -i input.mp4 -vf "chromakey=0xf25b98:0.01:0" -c copy -c:v png output.mov

    I confirmed that #f25b98 is the color I am replacing. This makes absolutely nothing transparent. When I try :

    ffmpeg -i input.mp4 -vf "chromakey=0xf25b98:0.02:0" -c copy -c:v png output.mov

    I get some weird transparent dots in my pink but still nothing is changed (see attached screenshot from video).

    Why would ffmpeg exhibit this behavior ?

    output image

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