
Recherche avancée
Autres articles (55)
-
Websites made with MediaSPIP
2 mai 2011, parThis page lists some websites based on MediaSPIP.
-
Gestion générale des documents
13 mai 2011, parMédiaSPIP ne modifie jamais le document original mis en ligne.
Pour chaque document mis en ligne il effectue deux opérations successives : la création d’une version supplémentaire qui peut être facilement consultée en ligne tout en laissant l’original téléchargeable dans le cas où le document original ne peut être lu dans un navigateur Internet ; la récupération des métadonnées du document original pour illustrer textuellement le fichier ;
Les tableaux ci-dessous expliquent ce que peut faire MédiaSPIP (...) -
Creating farms of unique websites
13 avril 2011, parMediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)
Sur d’autres sites (5330)
-
Frame Accurate Seeking in WebM
11 janvier 2016, par SapphireSunI’m trying to do a somewhat tricky thing with WebM. I am trying to encode a stack of 256 biological images as a WebM. The time dimension of motion is very similar to the space dimension of the image stack so the compression ratios are insanely good. However, I am having trouble decoding the movie frames. I know that WebM uses an IPB predictive coding scheme, but I was reading several blog posts and discussion groups from WHATWG from 2011, and they said that frame accurate seeking was working in Chrome at that time.
When I do
video.currentTime = 0
, I correctly get this :However, if I do
video.currentTime = 0.34
(for example) I get something that looks like this :It looks like I’m getting a random poorly predicted frame. Am I just encoding the video wrong ? When I play it normally it looks fine.
I encoded the video using 256 pngs using ffmpeg compiled with libvpx using the VP8 codec.
ffmpeg -y -framerate 60 -start_number 0 -pattern_type glob -i '*.png' -qmin 10 -qmax 42 out.webm
References to the WHATWG and some other info from 2011 :
WHATWG discusses frame accuracy :
https://lists.w3.org/Archives/Public/public-whatwg-archive/2011Jan/0372.html
BBC Tech Director talking about frame accuracy :
http://www.bbc.co.uk/blogs/bbcinternet/2011/02/frame_accurate_video_in_html5.html
-
FFMPEG Command line for producing video for Tivo S3 and S4 RSS feed functionality
16 décembre 2015, par user793586I have been trying to generate a solid video/audio ffmpeg command line configuration that will produce an HD quality video. The output needs to play on both the Tivo S3 and S4 boxes using the RSS vod feature. The following settings are required.
Video :
Multiplexer type : MPEG-4 System
Video Dimension : 1280 x 720
Aspect Ratio : 16:9
Frame Rate : 29.97fps
Interlacing : Non-Interlaced
Bite Rate Mode : VBR
Number of passes : 2
Video Bitrate : 3000 kbps
Maximum Bitrate : 8000 kbps
Profile : Main
Level : 3.2
Number of B-Pictures : 2
Audio :
Audio Stream Type : AAC
Bits / Sample : 16
Channels : Stereo
Sample Rate : 48K
Audio Bitrate : 128 kbps
-
dxtory : Unify and rework the decoding routines
3 septembre 2015, par Luca Barbato