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Médias (1)
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La conservation du net art au musée. Les stratégies à l’œuvre
26 mai 2011
Mis à jour : Juillet 2013
Langue : français
Type : Texte
Autres articles (101)
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HTML5 audio and video support
13 avril 2011, parMediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
For older browsers the Flowplayer flash fallback is used.
MediaSPIP allows for media playback on major mobile platforms with the above (...) -
Librairies et binaires spécifiques au traitement vidéo et sonore
31 janvier 2010, parLes logiciels et librairies suivantes sont utilisées par SPIPmotion d’une manière ou d’une autre.
Binaires obligatoires FFMpeg : encodeur principal, permet de transcoder presque tous les types de fichiers vidéo et sonores dans les formats lisibles sur Internet. CF ce tutoriel pour son installation ; Oggz-tools : outils d’inspection de fichiers ogg ; Mediainfo : récupération d’informations depuis la plupart des formats vidéos et sonores ;
Binaires complémentaires et facultatifs flvtool2 : (...) -
Formulaire personnalisable
21 juin 2013, parCette page présente les champs disponibles dans le formulaire de publication d’un média et il indique les différents champs qu’on peut ajouter. Formulaire de création d’un Media
Dans le cas d’un document de type média, les champs proposés par défaut sont : Texte Activer/Désactiver le forum ( on peut désactiver l’invite au commentaire pour chaque article ) Licence Ajout/suppression d’auteurs Tags
On peut modifier ce formulaire dans la partie :
Administration > Configuration des masques de formulaire. (...)
Sur d’autres sites (6202)
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How to correct crop image using FFMPEG&XILINX
17 mai 2023, par DmytroI use AWS vt1 with Xilinx SDK and FFMPEG. All from the AWS box with pre-built SDK and so on.
I need to extract frames from fullHD but scale it to 480p
I stuck with it. Could someone help with the correct options ?


I have this Python-based code :



 # If the video is greater than 480p, resize the frames to 480p
 if height > 480:
 command = [
 ffmpeg_path,
 '-c:v', 'mpsoc_vcu_h264',
 '-i', temp_video,
 '-filter_complex',
 'multiscale_xma=outputs=1: out_1_width=848: out_1_height=480: out_1_rate=half:[b]; [b]xvbm_convert[b1]',
 '-pix_fmt', 'yuv420p',
 '-ss', str(median_time),
 '-map', '[b1]',
 '-vframes', '1',
 '-q:v', '2',
 '-f', 'image2pipe',
 '-vcodec', 'mjpeg',
 '-y', '-'
 ]
 else: # Preserve the original resolution
 command = [
 ffmpeg_path,
 '-c:v', 'mpsoc_vcu_h264',
 '-i', temp_video,
 '-vf', 'xvbm_convert',
 '-pix_fmt', 'yuv420p',
 '-ss', str(median_time),
 '-vframes', '1',
 '-q:v', '2',
 '-f', 'image2pipe',
 '-vcodec', 'mjpeg',
 '-y', '-'
 ]
 output = subprocess.run(command, capture_output=True)
 frame = output.stdout




The second option with '-vf', 'xvbm_convert', work perfectly.
But the issue with the first.


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Is it possible to fetch some key-frames of a video by using the HTTP Range header
9 décembre 2020, par pvdI've read the SO problem , and it seems not applying to my specific case.


Is it possible to fetch some key-frames of a video from web server by the HTTP Range header ? For example, for a 30 seconds duration video, we'd like to analysis the I-frame around 00:00:02, 00:00:15, 00:00:28.


I need to analysis the videos from internal web server to detect if there's specific watermarks in it and some other analysis.


Since the first I-frame might be invalid sometimes(Logo for example), we were planning to extract the I-frame from the 00:00:02, the middle I-frame, and the last 2nd second I-frame.


For example, for a 30 seconds duration video, we'd like to analysis the I-frame around 00:00:02, 00:00:15, 00:00:28.


We could make it works while download the whole video, since most of the data we downloaded from the server are not being used. I was wondering if maybe we could only use the HTTP Range header to download partial data and analysis it ?


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avcodec/indeo3data : fix undefined left shift of negative number
19 septembre 2015, par Ganesh Ajjanagaddeavcodec/indeo3data : fix undefined left shift of negative number
This fixes a whole sea of -Wshift-negative-value reported with clang 3.7+, e.g
http://fate.ffmpeg.org/log.cgi?time=20150918181527&log=compile&slot=x86_64-darwin-clang-polly-vectorize-stripmine-3.7.
Any half decent compiler should anyway optimize away the multiplication.Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
Signed-off-by : James Almer <jamrial@gmail.com>