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Autres articles (46)
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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 (...) -
MediaSPIP version 0.1 Beta
16 avril 2011, parMediaSPIP 0.1 beta est la première version de MediaSPIP décrétée comme "utilisable".
Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
Pour avoir une installation fonctionnelle, 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 (...)
Sur d’autres sites (6863)
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FFMPEG - How to Extract Frames As Images While Removing Sequentially Duplicate Frames
19 mars 2017, par Michael NelsonIs there any way (via script or preferably some parameter in calling ffmpeg that I missed) to extract frames from an avi file and ignore sequentially duplicate frames, thus being able to go through the pictures looking only at the deltas/changes ?
I frequently have to record meetings at work and a lot of the time, the client screen that I am looking at is not changing while we are talking over the phone. After the meeting is over, I need to use these images as part of our documentation and specifications gathering.
I know that I could just output every frame and run them through any given duplicate file remover utility, but this would remove ALL duplicate frames. So, if the frames extracted went like this :
A, A, A, B, B, B, B, C, C, A, A, C, C, C, B, B, B ...
Running them through a typical duplicate file remover, I would get : A, B, C
What I would want is : A, B, C, A, C, B
The command that I am currently using to extract the images is :
ffmpeg.exe -i file.avi -ss 0 -sameq -f image2 -r 1 images%5d.png
I was getting every frame beforehand (removing the -r 1 from above), but that was generating way too many frames to deal with since these online meetings can go for hours, so for now, I get one frame per second from the file.
A Windows based solution would be preferable, however, I’m sure other people would be interested in solutions on other platforms if available.
Any solution or point in the right direction is much appreciated.
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FFMPEG - How to setup volume when merging two audio streams
6 octobre 2014, par N3shI just recently entered the magic and scary world of FFMPEG and, although I found quite a lot of guides online, I need help for my current problem.
I am merging only audio files and I would like to be able to select their volume.
Here is my current code for merging 2 files :
ffmpeg -i test\audio00.mp3 -i test\audio01.mp3 -filter_complex amerge
-c:a libmp3lame -q:a 0 test\output_overlay.mp3I tried the following code, extracted from another answer here on SO (the User was also handling video), but it doesn’t work for me :
ffmpeg -i test\audio00.mp3 -i test\audio01.mp3 -filter_complex "[0:a]volume=0.9[a1];
[1:a]volume=0.781250[a2]; [a1][a2]amerge,pan=stereo:c0code>I got this error :
[AVFilterGraph @ 030fa8c0] The following filters could not choose their formats:
Parsed_amerge_2 Consider inserting the (a)format filter near their input or output.Is there a simple way to change the volume for the two streams (even for just the second one, it’s the background music) with FFMPEG ?
P.S. Also, is it possible to have some sort of ’preview’ before actually rendering the file ?
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Extract specific frames of youtube video without downloading video
22 janvier 2023, par Kashish AroraI need to extract specific frames of an online video to work on an algorithm but I don't want to download the whole video because that would make it highly inefficient.


For starters, I tried working with youtube videos. I can download whole of the video using
youtube-dl
in this way :

ydl_opts = {'outtmpl': r'OUTPUT_DIRECTORY_HERE',}
with youtube_dl.YoutubeDL(ydl_opts) as ydl:
 ydl.download([url])



And then I can capture individual frames.


I need to avoid downloading the whole video. After some research, I have found that
ffmpeg
might help me do this. I found no way to download just the frames so if this is not possible, the second option is that I can download specific portions of the video. One such example in linux is here but I couldn't find any solution for python.

What is a good way to download just the frames, or portions of videos (in python) without downloading the entire thing ?