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  • Les formats acceptés

    28 January 2010, by

    Les commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
    ffmpeg -codecs ffmpeg -formats
    Les format videos acceptés en entrée
    Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
    Les formats vidéos de sortie possibles
    Dans un premier temps on (...)

  • Supporting all media types

    13 April 2011, by

    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 (...)

  • Ajouter notes et légendes aux images

    7 February 2011, by

    Pour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
    Une fois le plugin activé, vous pouvez le configurer dans l’espace de configuration afin de modifier les droits de création / modification et de suppression des notes. Par défaut seuls les administrateurs du site peuvent ajouter des notes aux images.
    Modification lors de l’ajout d’un média
    Lors de l’ajout d’un média de type "image" un nouveau bouton apparait au dessus de la prévisualisation (...)

On other websites (5354)

  • libvpx: check if CQ level is in correct bounds

    25 February 2013, by slhck

    libvpx: check if CQ level is in correct bounds

  • Recommendations for real-time pixel-level analysis of television (TV) video

    6 December 2011, by Randall Cook

    [Note: This is a rewrite of an earlier question that was considered inappropriate and closed.]

    I need to do some pixel-level analysis of television (TV) video. The exact nature of this analysis is not pertinent, but it basically involves looking at every pixel of every frame of TV video, starting from an MPEG-2 transport stream. The host platform will be server-class, multiprocessor 64-bit Linux machines.

    I need a library that can handle the decoding of the transport stream and present me with the image data in real-time. OpenCV and ffmpeg are two libraries that I am considering for this work. OpenCV is appealing because I have heard it has easy to use APIs and rich image analysis support, but I have no experience using it. I have used ffmpeg in the past for extracting video frame data from files for analysis, but it lacks image analysis support (though Intel's IPP can supplement).

    In addition to general recommendations for approaches to this problem (excluding the actual image analysis), I have some more specific questions that would help me get started:

    1. Are ffmpeg or OpenCV commonly used in industry as a foundation for real-time
      video analysis, or is there something else I should be looking at?
    2. Can OpenCV decode video frames in real time, and still leave enough
      CPU left over to do nontrivial image analysis, also in real-time?
    3. Is sufficient to use ffpmeg for MPEG-2 transport stream decoding, or
      is it preferable to just use an MPEG-2 decoding library directly (and if so, which one)?
    4. Are there particular pixel formats for the output frames that ffmpeg
      or OpenCV is particularly efficient at producing (like RGB, YUV, or YUV422, etc)?

  • command for ffmpeg encode h264 baseline profile level 1

    25 December 2011, by Morteza M.

    Can anyone suggest a command to encode video to h264 baseline profile ( level 1)?

    Here is a link for reference: http://blog.mediacoderhq.com/h264-profiles-and-levels/

    I used this command but ffmpeg says it is Main profile not baseline.

    ffmpeg -i <source> -vcodec libx264 -coder 0 -flags +loop+mv4 \
    
-partitions +parti4x4+parti8x8+parti4x4+partp8x8+partb8x8 -me_method hex -subq 7 \
    
-trellis 1 -refs 5 -bf 0 -flags2 +mixed_refs -coder 0 -me_range 16 -threads 2 \
    
-s 240x160 -b:v 64k -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 \
    
-qmin 10 -qmax 51 -qdiff 4 -strict experimental -acodec aac -ac 1 -ab 48000 \
    
-f mpegts udp://127.0.0.1:10006?pkt_size=1316
    
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