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Médias (1)
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Video d’abeille en portrait
14 mai 2011, par
Mis à jour : Février 2012
Langue : français
Type : Video
Autres articles (57)
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Les autorisations surchargées par les plugins
27 avril 2010, parMediaspip core
autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs -
Librairies et logiciels spécifiques aux médias
10 décembre 2010, parPour un fonctionnement correct et optimal, plusieurs choses sont à prendre en considération.
Il est important, après avoir installé apache2, mysql et php5, d’installer d’autres logiciels nécessaires dont les installations sont décrites dans les liens afférants. Un ensemble de librairies multimedias (x264, libtheora, libvpx) utilisées pour l’encodage et le décodage des vidéos et sons afin de supporter le plus grand nombre de fichiers possibles. Cf. : ce tutoriel ; FFMpeg avec le maximum de décodeurs et (...) -
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 (8947)
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extract NAL units bitstream from an MP4 video
8 juillet 2017, par lightingIs it possible to extract every NAL units bitstream ? (the actual bitstream)
for example extract them like this :
(4byte length + the remaining bytes till the end of the unit) and do this for all the units in a MP4 video ? actually i want to check the occurrence of the 2 bytes after the 4byte length in a MP4 video (coded with H.264 codec).
can i use FFmpeg for this ?Thanks !
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Gstreamer playing audio from video file with (uri)decodebin - high CPU usage
28 mai 2017, par Alexey ElesinI’m using gstreamer to convert audio from files/RTMP/RTSP streams and then analyze it.
The problem is, if my source file is video or videostream gstreamer uses a lot of CPU.
Example 1 (video) - uses 30-35% of CPU as htop says.
gst-launch-1.0 uridecodebin uri='test.mp4' ! autoaudiosink
Example 2 (audio from video file above converted with ffmpeg -c copy) - uses 2-4% of CPU
gst-launch-1.0 uridecodebin uri='test.mp3' ! autoaudiosink
How can I specify that I only need audio source from the video file ?
I’m using decodebin because I don’t know which files (formats) I will get from users.
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Check the Validity of x264 Nal Units
15 janvier 2014, par bhaweshI am working with x264 encoder api where for every encoded picture i get a number of nal unit. is there any way i can check whether nals are valid or not in my VS2010 Debugger. Currently i can see the following information: :
i_ref_idc -858993460
i_type -858993460
b_long_startcode -858993460
i_first_mb -858993460
i_last_mb -858993460
i_payload 27
p_payload 0x06b94d68
i_padding -858993460i m not sure whether these negative values are representing that nals are invalid or it is missing information.
Basically how can i check that the nals i got from x264_encoder_encode() is a valid nal unit ?
NOTE : : i m using these nals to stream live using LIVE555.