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Médias (91)

Autres articles (92)

  • Amélioration de la version de base

    13 septembre 2013

    Jolie sélection multiple
    Le plugin Chosen permet d’améliorer l’ergonomie des champs de sélection multiple. Voir les deux images suivantes pour comparer.
    Il suffit pour cela d’activer le plugin Chosen (Configuration générale du site > Gestion des plugins), puis de configurer le plugin (Les squelettes > Chosen) en activant l’utilisation de Chosen dans le site public et en spécifiant les éléments de formulaires à améliorer, par exemple select[multiple] pour les listes à sélection multiple (...)

  • Emballe médias : à quoi cela sert ?

    4 février 2011, par

    Ce plugin vise à gérer des sites de mise en ligne de documents de tous types.
    Il crée des "médias", à savoir : un "média" est un article au sens SPIP créé automatiquement lors du téléversement d’un document qu’il soit audio, vidéo, image ou textuel ; un seul document ne peut être lié à un article dit "média" ;

  • XMP PHP

    13 mai 2011, par

    Dixit Wikipedia, XMP signifie :
    Extensible Metadata Platform ou XMP est un format de métadonnées basé sur XML utilisé dans les applications PDF, de photographie et de graphisme. Il a été lancé par Adobe Systems en avril 2001 en étant intégré à la version 5.0 d’Adobe Acrobat.
    Étant basé sur XML, il gère un ensemble de tags dynamiques pour l’utilisation dans le cadre du Web sémantique.
    XMP permet d’enregistrer sous forme d’un document XML des informations relatives à un fichier : titre, auteur, historique (...)

Sur d’autres sites (15893)

  • playback of ffmpeg converted video on LDPI device (Samsung S5300 240 x 320)

    25 décembre 2013, par user737486

    I have Full HD video taken by Samsung Galaxy S4 camera.
    video stream info as follows :

    {"index":0,"codec_name":"h264","codec_long_name":"H.264 \/ AVC \/ MPEG-4 AVC \/ MPEG-4 part 10","profile":"High","codec_type":"video","codec_time_base":"1\/180000","codec_tag_string":"avc1","codec_tag":"0x31637661","width":1920,"height":1080,"has_b_frames":0,"sample_aspect_ratio":"0:1","display_aspect_ratio":"0:1","pix_fmt":"yuv420p","level":40,"r_frame_rate":"30\/1","avg_frame_rate":"21240000\/707831","time_base":"1\/90000","start_pts":0,"start_time":"0.000000","duration_ts":1415662,"duration":"15.729578","bit_rate":"16553536","nb_frames":"472","disposition":{"default":1,"dub":0,"original":0,"comment":0,"lyrics":0,"karaoke":0,"forced":0,"hearing_impaired":0,"visual_impaired":0,"clean_effects":0,"attached_pic":0},"tags":{"rotate":"90","creation_time":"2013-12-24 10:19:18","language":"eng","handler_name":"VideoHandle"}}

    in short it is 1920x1080, 16KK bitrate, rotation : 90.
    I'm converting it using ffmpeg by the following command :

    ffmpeg -y -threads 8 -i input.mp4 -vcodec libx264 -vpre ipod640 -s 324x576 -strict -2 -b:v 512k -acodec aac -ac 1 -ar 16000 -ab 32000 -vf "transpose=1" -metadata:s:v:0 rotate=0  output.mp4

    The output video stream info :

     {"index":0,"codec_name":"h264","codec_long_name":"H.264 \/ AVC \/ MPEG-4 AVC \/ MPEG-4 part 10","profile":"Constrained Baseline","codec_type":"video","codec_time_base":"1\/48","codec_tag_string":"avc1","codec_tag":"0x31637661","width":324,"height":576,"has_b_frames":0,"sample_aspect_ratio":"0:1","display_aspect_ratio":"0:1","pix_fmt":"yuv420p","level":30,"r_frame_rate":"24\/1","avg_frame_rate":"24\/1","time_base":"1\/12288","start_pts":0,"start_time":"0.000000","duration_ts":72192,"duration":"5.875000","bit_rate":"521597","nb_frames":"141","disposition":{"default":1,"dub":0,"original":0,"comment":0,"lyrics":0,"karaoke":0,"forced":0,"hearing_impaired":0,"visual_impaired":0,"clean_effects":0,"attached_pic":0},"tags":{"language":"eng","handler_name":"VideoHandler"}}

    The output video being played without any problem, on many different devices and OSes including different iOs and androids, but Samsung S5300 doesn't play it. From the device log I can see the following exception :

    E/AwesomePlayer( 1349): This resolution [324X576] Not Supported

    But, when I change the width and height to 576x324 the video can be played on S5300, but in wrong rotation.
    What should I add in ffmpeg parameters to make it play in correct orientation ?

    ffmpeg version :

    ffmpeg version git-2013-12-22-911676c Copyright (c) 2000-2013 the FFmpeg developers built on Dec 22 2013 22:55:31 with gcc 4.4.5 (Debian 4.4.5-8)

    Thanks

  • Append video files of different width, height

    28 novembre 2013, par Jatin

    I am building an application where user can record a screencast. Integral part of application is that, one can pause recording and resume it later any time (the session is maintained on server side).

    So say when user starts recording the screen, the width and height is :1024*768. Using xuggler (java wrapper for ffmpeg), I am able to generate a video. But say later he is on a different system and wishes to resume screen cast, then resolution changes to 1080 * 720. At this stage, I record it seperately and then try merging two files. But because the width & height are not same, I get the below exception :

    16:38:03.916 [main] WARN com.xuggle.xuggler - Got error : picture is
    not of the same width as this Coder
    (../../../../../../../csrc/com/xuggle/xuggler/StreamCoder.cpp:1430)
    Exception in thread "main" java.lang.RuntimeException : failed to
    encode video

    What is the best way to solve this Issue. The user can be on screen with different width and height. How do I merge (or any other alternatives, probably append) video files of different width and height ?

  • avfilter/vf_psnr : Prevent integer overflow.

    21 septembre 2013, par Neil Birkbeck
    avfilter/vf_psnr : Prevent integer overflow.

    The 32-bit integer accumulator in MSE computation can overflow for 8-bit frame data.
    
(e.g., for 1080p white frame compared to a black frame can give sum of 255*255*1080*1920 > 2^32).
    

    Signed-off-by : Neil Birkbeck <neil.birkbeck@gmail.com>
    
Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
    • [DH] libavfilter/vf_psnr.c

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