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Autres articles (79)
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Amélioration de la version de base
13 septembre 2013Jolie 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 (...) -
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" (...) -
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 (...)
Sur d’autres sites (9790)
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ffmpeg for archval and convertability
26 juillet 2021, par SatyaI've got a couple hundred gigs of *.dv files. I'd like to convert them to H.264 or something else or even leave them alone. The purpose is archival, with an eye to maximum convertability especially to DVD. The content is family videos.


Would this be fine ?


ffmpeg -i input.dv \
 -c:v libx264 -preset slower \
 -crf 17 \
 -pix_fmt yuv420p \
 output.mp4



I went with the
slower
preset because encoding time isn't an issue and I'd like a smaller file size. crf 17 is for least-lossy while being widely playable. I read somewhere that yuv420p is needed for some Quicktime players.

Should I throw in
-c:a aac
for AAC audio ? The audio is voice only, no need for music-hall quality.

I looked at https://trac.ffmpeg.org/wiki/Encode/H.264 for previous research and that's where I got those settings, but it is silent on the audio settings.


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SDL2 C++ Capturing Video of Renderer Animation/Sprite
27 octobre 2016, par alokI have an animation/sprite created using SDL2. The animation works fine when it is being rendered to a screen. But now I also want it to be recorded into a video file (locally stored). For this, I am planning on using FFmpeg APIs, to which I’ll be sending a raw RGB pixel data array.
My problem is with fetching the data from SDL2 APIs.
What I’ve tried is :
// From http://stackoverflow.com/questions/30157164/sdl-saving-window-as-bmp
SDL_Surface *sshot = SDL_CreateRGBSurface(0, 750, 750, 32, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);
SDL_RenderReadPixels(gRenderer, NULL, SDL_PIXELFORMAT_ARGB8888, sshot->pixels, sshot->pitch);
// From https://wiki.libsdl.org/SDL_RWFromMem
char fName[50];
sprintf(fName, "/tmp/a/ss%03d.bmp", fileCnt);
char bitmap[310000];
SDL_RWops *rw = SDL_RWFromMem(bitmap, sizeof(bitmap));
SDL_SaveBMP_RW(sshot, rw, 1);Above does not work. But dumping a single frame into a file with following code works :
SDL_SaveBMP(sshot, "/tmp/alok1/ss.bmp")
This obviously is not an acceptable solution - Writing to thousands of BMPs and then using FFmpeg from command-line to create a video.
What am I doing wrong ? How do you extract data from SDL_RWops ? Is the use of SDL_RWFromMem the right approach to my problem statement ?
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How to install libavcodec and libavutil from its source in linux
25 janvier 2017, par neckTwiFFMPEG is providing
libavutil
andlibavcodec
libraries. While compiling and installingffmpeg
as described at https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu I can findlibavcodec
andlibavutil
folders in theffmpeg
source folder. I want to install these libraries to use them in my c++ programs. But there are no Makefiles in these folders. How can I install them ?