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Autres articles (80)
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La file d’attente de SPIPmotion
28 novembre 2010, parUne file d’attente stockée dans la base de donnée
Lors de son installation, SPIPmotion crée une nouvelle table dans la base de donnée intitulée spip_spipmotion_attentes.
Cette nouvelle table est constituée des champs suivants : id_spipmotion_attente, l’identifiant numérique unique de la tâche à traiter ; id_document, l’identifiant numérique du document original à encoder ; id_objet l’identifiant unique de l’objet auquel le document encodé devra être attaché automatiquement ; objet, le type d’objet auquel (...) -
MediaSPIP v0.2
21 juin 2013, parMediaSPIP 0.2 est la première version de MediaSPIP stable.
Sa date de sortie officielle est le 21 juin 2013 et est annoncée ici.
Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
Comme pour la version précédente, il est nécessaire d’installer manuellement l’ensemble des dépendances logicielles sur le serveur.
Si vous souhaitez utiliser cette archive pour une installation en mode ferme, il vous faudra également procéder à d’autres modifications (...) -
Mise à disposition des fichiers
14 avril 2011, parPar défaut, lors de son initialisation, MediaSPIP ne permet pas aux visiteurs de télécharger les fichiers qu’ils soient originaux ou le résultat de leur transformation ou encodage. Il permet uniquement de les visualiser.
Cependant, il est possible et facile d’autoriser les visiteurs à avoir accès à ces documents et ce sous différentes formes.
Tout cela se passe dans la page de configuration du squelette. Il vous faut aller dans l’espace d’administration du canal, et choisir dans la navigation (...)
Sur d’autres sites (7085)
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Video processing / playback with alpha channel in C# or C++ [closed]
2 avril 2013, par CoryluluWHAT I'M AFTER
I've been exploring the best ways to do this, but seem to keep running into hiccups when trying to playback video and then grab the frame with an alpha channel (ARGB) to then be further manipulated.
I've gotten everything to work with
AForge
to then find out that the Alpha gets stripped out during the process. I consideredOpenCV
, but theEmgu CV
has a different license that I can't use and I can't verify thatOpenCV
can read Alpha channels as well.I looked into
FFMPEG .NET wrappers
, but haven't found any that are out of their alpha phase or have a license I can use them with (since this could be used for commercial purposes and can't be open sourced)So I'm looking for a library that is preferably C# or C++ that can play a .MOV or .AVI while preserving it's alpha channel when I make it into a
Bitmap
.SUMMARY [TL ;DR]
I'm looking for library / sample code
- Written preferably in C#, C++ as a fallback. Hopefully easy enough to use.
- Can playback
AVI
andMOV
files - Will preserve the alpha channel
- Will allow me to access each frame's ARGB values directly
- Preferably something that uses the
FFMPEG library
since it's able to read most formats I need
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creation of video file with alpha channel/transparency
3 décembre 2015, par boerfiI’m experimenting with a video file with alpha channel.
Later on the file should be an overlay for another video. It will be merged with another file in real time and saved to another file. But that is not the important point. The problem starts earlier because I can’t even play it.The video is a png-encoded Quicktime-file which I cannot play with any video player. WMP, VLC, MPC and ffplay all show various problems which all lead to the problem that the images seem to get decoded too slowly.
The strange thing is that neither cpu (i7) nor my ssd are on limit but the file isn’t played correctly.Since the problem appears with all players I think it’s based on using png in video. I googled but didn’t find a proper way to create a partly transparent video file.
I tried various methods of exporting (with adobe media encoder) with no result : the file lost its transparency or is running too slow.The resulting file which I create with my SDK is correct (video and audio are synchronous and fluid) but it takes 1 minute to render a video of 40 seconds although it works in real time with files without transparency.
Does anyone know what kind of file I should export that has a minimum resolution of 720p, that is partly transparent and that can be played with ffplay in real time ?
I would also appreciate any experiences with partly transparent videos which could help me because I couldn’t find any helpful links ?Thanks,
Marius -
avfilter/asrc_aevalsrc : fix cases of unknown channel layout
13 juillet 2013, par Michael Niedermayer