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Médias (1)
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SWFUpload Process
6 septembre 2011, par
Mis à jour : Septembre 2011
Langue : français
Type : Texte
Autres articles (104)
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Ajouter des informations spécifiques aux utilisateurs et autres modifications de comportement liées aux auteurs
12 avril 2011, parLa manière la plus simple d’ajouter des informations aux auteurs est d’installer le plugin Inscription3. Il permet également de modifier certains comportements liés aux utilisateurs (référez-vous à sa documentation pour plus d’informations).
Il est également possible d’ajouter des champs aux auteurs en installant les plugins champs extras 2 et Interface pour champs extras. -
Use, discuss, criticize
13 avril 2011, parTalk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
A discussion list is available for all exchanges between users. -
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 (...)
Sur d’autres sites (7323)
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FFmpeg deshake a video
1er juin 2022, par K. MorrisI am trying to deshake a video using FFmpeg. I am having trouble with the syntax. I have tried :



ffmpeg -filter -deshake -i "D :\Projects\Lazarus\v2010\FFmpeg\src_vids\battle_royale.mp4" "D :\Projects\Lazarus\v2010\FFmpeg\src_vids\battle_royale_stable.mp4"

ffmpeg -i "D :\Projects\Lazarus\v2010\FFmpeg\src_vids\battle_royale.mp4" -filter -deshake "D :\Projects\Lazarus\v2010\FFmpeg\src_vids\battle_royale_stable.mp4"



Thanks to anyone who can help.


Also : When adding the tag "ffmpeg" I was reading that this question shd be asked in SuperUsers or VideoProduction.. but I don't know where those forums are. So I went to the StackOverflow Meta section to find out, and I'm not allowed to ask where those SuperUser and VideoProduction sections are, because I don't have enough trust points to ask a Meta question. So, I'm posting here in the hopes that someone can explain where I'm supposed to post this (or just answer the question directly). Thanks.


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How is frame data stored in libav ?
9 juillet 2020, par Wesley SI am trying to learn to use libav. I have followed the very first tutorial on dranger.com, but I got a little confused at one point.


// Write pixel data
for(y=0; ydata[0]+y*pFrame->linesize[0], 1, width*3, pFile);



This code clearly works, but I don't quite understand why, particulalry I don't understand how the frame data in
pFrame->data
stored, whether or not it depends on the format/codec in use, whypFrame->data
andpFrame->linesize
is always referenced at index 0, and why we are adding y topFrame->data[0]
.

In the tutorial it says




We're going to be kind of sketchy on the PPM format itself ; trust us, it works.




I am not sure if writing it to the ppm format is what is causing this process to seem so strange to me. Any clarification on why this code is the way it is and how libav stores frame data would be very helpful. I am not very familiar with media encoding/decoding in general, thus why I am trying to learn.


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What is the difference between "png" and "jpg -q 0" ?
28 août 2015, par xkfz007When you are using ffmpeg to extract images from videos, what is the difference between "png" and "jpg -q 0" ?
In my opinion, "-q 0" means the quantization is 0 and there is no compression. And the fact is the "jpg -q 0" is much smaller than "png"
The commands like :ffmpeg -i a.mp4 image-%d.png
ffmpeg -i a.mp4 -q 0 image-%d.jpg