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Médias (1)
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Rennes Emotion Map 2010-11
19 octobre 2011, par
Mis à jour : Juillet 2013
Langue : français
Type : Texte
Autres articles (14)
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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 (...) -
Support de tous types de médias
10 avril 2011Contrairement à beaucoup de logiciels et autres plate-formes modernes de partage de documents, MediaSPIP a l’ambition de gérer un maximum de formats de documents différents qu’ils soient de type : images (png, gif, jpg, bmp et autres...) ; audio (MP3, Ogg, Wav et autres...) ; vidéo (Avi, MP4, Ogv, mpg, mov, wmv et autres...) ; contenu textuel, code ou autres (open office, microsoft office (tableur, présentation), web (html, css), LaTeX, Google Earth) (...)
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Support audio et vidéo HTML5
10 avril 2011MediaSPIP utilise les balises HTML5 video et audio pour la lecture de documents multimedia en profitant des dernières innovations du W3C supportées par les navigateurs modernes.
Pour les navigateurs plus anciens, le lecteur flash Flowplayer est utilisé.
Le lecteur HTML5 utilisé a été spécifiquement créé pour MediaSPIP : il est complètement modifiable graphiquement pour correspondre à un thème choisi.
Ces technologies permettent de distribuer vidéo et son à la fois sur des ordinateurs conventionnels (...)
Sur d’autres sites (3947)
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hevc : a much faster implementation of intra prediction (up to 1s on
13 mai 2014, par Mickaël Raulet -
Alter YUV values of AVFrames in FFMpeg
1er février 2012, par KageI'm trying to apply an effect to a video by altering the YUV values using FFMpeg programmatically in C.
Let's say I want to increase the luminescence of each pixel of each frame by 100.
I tried just altering the first frame of a video stream. I decoded the frame, added 100 to each Y value in the AVFrame->data[0], encoded the frame again and saved it into the video.
However when I play the video back, it is not only the first frame that has been altered, but the first 30 frames.
Why are the other frames effected when I only change the AVFrame->data of the first frame ?
I tried again by changing all the Y, U and V values in AVFrame->data to 0 for only the first frame.
When I play back the video, it starts off completely green like expected, after the first frame the video stays green for 30 frames. I can see the other frames start to come slowly through the green for 30 frames and then suddenly the green disappears and the video plays as normal. Why is it not just the first frame that is green ?
My method is as follows :
Video Stream
|
| *(Get a frame)*
|
vAVPacket (encoded data)
|
| *(Decode the frame)*
|
vAVFrame (raw data) --------------------------------------------------> AVFrame (raw data)
*(Edit AVFrame->data values)*
|
| *(encode frame)*
|
V
AVPacket (encoded data)
|
| *(save frame)*
|
V
Video StreamAm I doing something obviously wrong ?
How can I change just one frame without effecting the others ?
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How do I make non-interleaved AVI video in ffmpeg ?
26 avril 2021, par Schwonder ReismusI'm trying to merge 2 uncompressed videos in Audacity just for fun. Back in the days, I did make non-interleaved AVI's in Sony Vegas, and it worked well. Now i'm trying it with open-source software. I'm not satisfied with the interleaved AVI's.