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Autres articles (85)

  • 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 (...)

  • Dépôt de média et thèmes par FTP

    31 mai 2013, par

    L’outil MédiaSPIP traite aussi les média transférés par la voie FTP. Si vous préférez déposer par cette voie, récupérez les identifiants d’accès vers votre site MédiaSPIP et utilisez votre client FTP favori.
    Vous trouverez dès le départ les dossiers suivants dans votre espace FTP : config/ : dossier de configuration du site IMG/ : dossier des média déjà traités et en ligne sur le site local/ : répertoire cache du site web themes/ : les thèmes ou les feuilles de style personnalisées tmp/ : dossier de travail (...)

  • 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 (4400)

  • What is the ideal image format extraction for YUV color space and lossless compression from mxf video format using ffmpeg

    15 février 2016, par DragonDance27

    I would like to be able to work on frames from an .mxf video file. The image format of the video is JPEG 2000, using a YUV color space with 4:2:2 subsampling and lossless compression.

    My intentions are to extract frames from this video using ffmpeg. Extracted frames would then be processed in Matlab (at the moment I’m interested in performing colorization).

    I want to extract the frames with as minimal data loss as possible and I would like to work in the YUV color space. I understand PNG involves a lossless process, but only involves the RGB color space - so not an option.

    I think I can extract jpeg2000 frames in the YUV color space, but I’m not sure if I’m losing data from the compression process. I attempted the following code in ffmpeg :

    ffmpeg -i video.mxf -r 1/5 out%03d.jp2

    ... however, the extracted jp2 files are unreadable in various software, including HiView which is a specialised JPEG 2000 software.

    Quesiton 1 : Is this jpeg 2000 extraction method lossless ? What am I doing wrong ?

    I also considered extracting the images in the tiff format where I can achieve the YUV and lossless requirements. I attempted the following code in ffmpeg :

    ffmpeg -i video.mxf -vcodec tiff f%10d.tif

    ... however, the extracted tiff files are unreadable in software such as paint, paint.net and windows photo viewer.

    Question 2 : Is this tiff extraction method correct ? What am I doing wrong ?

    Question 3 : What is an ideal image format that covers my YUV and lossless requirements ?

  • vc1 : initialize color properties

    5 octobre 2014, par Vittorio Giovara
    vc1 : initialize color properties
    • [DBH] libavcodec/vc1dec.c

  • x265 : Map color parameters

    13 avril 2015, par Luca Barbato
    x265 : Map color parameters
    • [DBH] libavcodec/libx265.c

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