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1 000 000 (wav version)
26 septembre 2011, par
Mis à jour : Avril 2013
Langue : English
Type : Audio
Autres articles (104)
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Les tâches Cron régulières de la ferme
1er décembre 2010, parLa gestion de la ferme passe par l’exécution à intervalle régulier de plusieurs tâches répétitives dites Cron.
Le super Cron (gestion_mutu_super_cron)
Cette tâche, planifiée chaque minute, a pour simple effet d’appeler le Cron de l’ensemble des instances de la mutualisation régulièrement. Couplée avec un Cron système sur le site central de la mutualisation, cela permet de simplement générer des visites régulières sur les différents sites et éviter que les tâches des sites peu visités soient trop (...) -
MediaSPIP 0.1 Beta version
25 avril 2011, parMediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
The zip file provided here only contains the sources of MediaSPIP in its standalone version.
To get a working installation, you must manually install all-software dependencies on the server.
If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...) -
Personnaliser en ajoutant son logo, sa bannière ou son image de fond
5 septembre 2013, parCertains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;
Sur d’autres sites (13517)
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Why is ffmpeg's hstack so much slower than overlay and pad ?
27 janvier 2021, par cgencoI'm using ffmpeg to stitch together two videos of people chatting into a video with each of them side-by-side, like this :




Here's the command I'm currently using to get this done, which runs at 2.5x on my 13" M1 MacBook Pro :


ffmpeg -y -i left.mp4 -i right.mp4 -filter_complex "
 [0:v] crop=w=in_w/2 [croppedLeft];
 [1:v][1:v] overlay=x=overlay_w/4 [shiftedRight];
 [shiftedRight][croppedLeft] overlay [vout];
 [0:a][1:a] amix [aout]
" -map "[vout]" -map "[aout]" -ac 2 out.mp4



This command crops the left video to half of its original width (cropping so the video is centered), then shifts the right video a quarter of its width to the right, then overlays the left video on the left half of the output merged with the shifted right video.


One day on my weekly fun-time read-through the FFmpeg filters documentation I stumbled on a filter named
hstack
, which is described as being "faster than using overlay and pad filter to create same output."

My ex wife can affirm that there are few higher priorities in my life than going faster, so I altered my ffmpeg script to use
hstack
instead of twooverlay
s :

ffmpeg -y -i left.mp4 -i right.mp4 -filter_complex "
 [0:v] crop=w=in_w/2 [croppedLeft];
 [1:v] crop=w=in_w/2 [croppedRight];
 [croppedLeft][croppedRight] vstack [vout];
 [0:a][1:a] amix [aout]
" -map "[vout]" -map "[aout]" -ac 2 out.mp4



...but that command runs painfully slowly, like 0.1x. It takes multiple minutes to render a single second.


So uhhh what's going on here ? Why is hstack taking so long when it's supposed to be faster ?


I've tried this on both the M1 native build from OSXExperts (version N-99816-g3da35b7) and the standard ffmpeg from brew and hstack is just as slow on each.


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play video using ffplay remotely
3 juin 2014, par Pavan KI am able to play videos with ffplay on the terminal of the computer using
ffplay video.mp4
But if I ssh into the computer via a different computer and call the command on the ssh terminal I get the following error.
Could not initialize SDL - Unable to open a console terminal
How can I invoke the video on the screen remotely ?
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Evolution #3740 : Constante _DUREE_COOKIE_CORRESPONDANCE
5 mars 2016, par jluc -cf discute http://forum.spip.net/fr_249598.html aussi