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Autres articles (103)
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MediaSPIP 0.1 Beta version
25 avril 2011, parMediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
The zip file provided here only contains the sources of MediaSPIP in its standalone version.
To get a working installation, you must manually install all-software dependencies on the server.
If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...) -
Le profil des utilisateurs
12 avril 2011, parChaque utilisateur dispose d’une page de profil lui permettant de modifier ses informations personnelle. Dans le menu de haut de page par défaut, un élément de menu est automatiquement créé à l’initialisation de MediaSPIP, visible uniquement si le visiteur est identifié sur le site.
L’utilisateur a accès à la modification de profil depuis sa page auteur, un lien dans la navigation "Modifier votre profil" est (...) -
Installation en mode standalone
4 février 2011, parL’installation de la distribution MediaSPIP se fait en plusieurs étapes : la récupération des fichiers nécessaires. À ce moment là deux méthodes sont possibles : en installant l’archive ZIP contenant l’ensemble de la distribution ; via SVN en récupérant les sources de chaque modules séparément ; la préconfiguration ; l’installation définitive ;
[mediaspip_zip]Installation de l’archive ZIP de MediaSPIP
Ce mode d’installation est la méthode la plus simple afin d’installer l’ensemble de la distribution (...)
Sur d’autres sites (16732)
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encode YUV420 frame to VP9
21 novembre 2018, par User800222As title,
I’m pulling frames from a IP camera. I converted the input raw data to YUV420 format, and would like to encode YUV420 to VP9, and save frames as .webm format. Would I be able to do that ? Or should I input a BGR444 format for encoding ?
BTW, to set up the parameters for encoding vp9. Is the
av_dict_set()
the right function for setting parameters ?Ex : (http://wiki.webmproject.org/ffmpeg/vp9-encoding-guide)
av_dict_set(&opt, "crf" , "23", 0);
av_dict_set(&opt, "speed" , "4" , 0);
av_dict_set(&opt, "threads", "8" , 0);
av_dict_set(&opt, "pass" , "1" , 0);
av_dict_set(&opt, "b:v", "1400k", 0);Edit : The wiki uses 2 pass for setting parameters, would I be able to do in with 1 pass ?
Edit2 : Blow code seems to be working, wonder how can I bring the size of the videos (vp9) down ? Currently, I have similar size as using h264 encoder.
av_dict_set(&opt, "crf" , "45", 0);
av_dict_set(&opt, "speed" , "8" , 0);
av_dict_set(&opt, "quality", "realtime", 0);
av_dict_set(&opt, "threads", "8" , 0);
av_dict_set(&opt, "tile-columns", "3", 0);
av_dict_set(&opt, "frame-parallel", "1", 0);
av_dict_set(&opt, "row-mt", "1", 0);Update1 :
YUV420P can be encoded as VP9 ! -
Create a looped video with countdown
13 décembre 2016, par Enrico DeleoSomething maybe challenging here :
I want to stream (via rtmp) a video with a fixed image and a countdown applied on it. I know I can create a slideshow with even audio background with ffmtp (http://trac.ffmpeg.org/wiki/Create%20a%20video%20slideshow%20from%20images) but I’m wondering if I can loop it AND apply an overlay with the countdown to a given date.Any ideas ?
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Is it possible to change volume with no reencode with ffmpeg ?
30 juin 2023, par John SmithI just had this question because I used the following command with ffmpeg :



ffmpeg -i input.wav -filter:a "volume=0.2" output.wav




Following the documentation here : https://trac.ffmpeg.org/wiki/AudioVolume



However, when I created the new file, the output was half the size of the input and the bitrate of the audio track was reduced as well.



So my questions are :



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- Is the bitrate supposed to decrease with decreasing and increasing volume like so ?
- Is it possible to change volume without reencoding with ffmpeg ?