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  • 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 (...)

  • 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 (...)

  • 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 (...)

Sur d’autres sites (2186)

  • Does Apple AS assembler replace certain NEON instructions with equivalent ones on iOS ?

    5 avril 2012, par Yi Wang

    I was trying to use ffmpeg on iOS and was debugging a crash in the optimized arm code. I have discovered that some unsigned (.u16, .u32) instruction have been replaced by signed ones (.i16, .i32). It's easy to see because disassembled instruction on GDB doesn't quite match the source code.

    For example,

    vrshrn.u32 -> vrshrn.i32
    
vrshrn.u16 -> vrshrn.i16
    
vadd.u16 -> vadd.i16

    My questions :

    1. Is this behavior correct and expected ? If not, how do we correct it ?
    2. If they are equivalent, why do we nee need the unsigned ones at all ? Is it because that way the code is more explicit ?
    3. Is this behavior expected with other platform's toolkit ? For example, Android's toolkit ? (I have heard Apple's AS is an ancient one)

  • How to convert video with transparency with ffmpeg (apple silicon) [closed]

    6 avril 2023, par Aleksei Maslakov

    I'm trying to convert a video with transparency with ffmpeg. The original video is encoded with HEVC. I read a couple of articles about conversion, preserving transparency, and tried encoding it with both HEVC and VP9, but had no success. I lose transparency in the process.

    


    The command I'm using is something like this :

    


    ffmpeg -i input.mp4 -vf "crop=in_w*0.5:in_h:in_w*0.25:0" -c:v libvpx-vp9 -crf 28 -pix_fmt yuva420p -an output_vp9.webm


    


    Don't know if that's important, I'm doing that on a mac with apple silicon, ffmpeg installed with home brew.
Would appreciate any help )
Thanks !

    


  • Fix libswresample compilation with Apple Neon assembler.

    17 février 2014, par Reimar Döffinger
    Fix libswresample compilation with Apple Neon assembler.

    Signed-off-by : Carl Eugen Hoyos <cehoyos@ag.or.at>
    • [DH] libswresample/arm/audio_convert_neon.S

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