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Carte de Schillerkiez
13 mai 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Texte
Autres articles (56)
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Keeping control of your media in your hands
13 avril 2011, parThe vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...) -
Initialisation de MediaSPIP (préconfiguration)
20 février 2010, parLors de l’installation de MediaSPIP, celui-ci est préconfiguré pour les usages les plus fréquents.
Cette préconfiguration est réalisée par un plugin activé par défaut et non désactivable appelé MediaSPIP Init.
Ce plugin sert à préconfigurer de manière correcte chaque instance de MediaSPIP. Il doit donc être placé dans le dossier plugins-dist/ du site ou de la ferme pour être installé par défaut avant de pouvoir utiliser le site.
Dans un premier temps il active ou désactive des options de SPIP qui ne le (...) -
Personnaliser les catégories
21 juin 2013, parFormulaire de création d’une catégorie
Pour ceux qui connaissent bien SPIP, une catégorie peut être assimilée à une rubrique.
Dans le cas d’un document de type catégorie, les champs proposés par défaut sont : Texte
On peut modifier ce formulaire dans la partie :
Administration > Configuration des masques de formulaire.
Dans le cas d’un document de type média, les champs non affichés par défaut sont : Descriptif rapide
Par ailleurs, c’est dans cette partie configuration qu’on peut indiquer le (...)
Sur d’autres sites (8756)
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FFmpeg - Xstack mutiple inputs for mosaic video output - extra output Blank screen is always green
16 août 2020, par DennisskiI have a website where we combine multple videos with ffmpeg xstack. Its an automated process. When there is not an even number of videos the blank tiles in the mosaic are green. I am trying to figure out how to make the spare blanks Black.


I have tried
xstack=inputs=2:fill='black':layout=0_0
(this gives an error object not found) also tried-filter_complex "color=s=1920x1080:c=black"
.

Any suggestions ? Here is entire command :


ffmpeg -i video1 -i video1 -i video1 -i video1 -i video1 -i video1 -i video1 \ 
 -i video1 -i video1 -filter_complex \
 "color=s=1920x1080:c=black;[0:v] setpts=PTS-STARTPTS, scale=qvga [a0];[1:v] setpts=PTS-STARTPTS, scale=qvga [a1];[2:v] setpts=PTS-STARTPTS, scale=qvga [a2];[3:v] setpts=PTS-STARTPTS, scale=qvga [a3];[4:v] setpts=PTS-STARTPTS, scale=qvga [a4];[5:v] setpts=PTS-STARTPTS, scale=qvga [a5];[6:v] setpts=PTS-STARTPTS, scale=qvga [a6];[7:v] setpts=PTS-STARTPTS, scale=qvga [a7];[8:v] setpts=PTS-STARTPTS, scale=qvga [a8];[a0][a1][a2][a3][a4][a5][a6][a7][a8]xstack=inputs=9:layout=0_0|w0_0|w0+w1_0|0_h0|w0_h0|w0+w1_h0|0_h0+h1|w0_h0+h1|w0+w1_h0+h1[out] " \
 -map "[out]" output



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fallback input when blackscreen ffmpeg
23 novembre 2022, par renadrI would like to have a "fallback" video when using the ffmpeg command. The goal is that I broadcast a video and once this one displays an almost black screen, there should be a switch to the fallback, and re-switch when the black screen is over. I know that we can detect the "blackframe" but I'm lost then.. If anyone have an idea ?


I'm at this point for the moment (I'm using streamlink for getting the input) :


streamlink <> best -O | ffmpeg -re -i pipe:0 -c:v libx264 -vf "blackframe=amount=40:thresh=5" -c:a aac -strict -2 -f flv <> | grep blackframe



thank you


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ffmpeg concat creates video with frame timings off by 0.1-0.2 seconds [closed]
17 octobre 2023, par brain-geekI am trying to create some variable frame rate video for test data, however frame timings of the result are consistently off. I tried both ffmpeg 4 and ffmpeg 6, but having same results. I am using example from the website as a reference.


Here is the script to generate video :


rm -f framelist.txt output.mp4

convert -size 640x480 -gravity center -background black -fill purple label:0-2 -units PixelsPerInch -density 254 0-2.png
echo "file '0-2.png'" >> framelist.txt
echo "duration 2" >> framelist.txt
convert -size 640x480 -gravity center -background black -fill purple label:2-2.5 -units PixelsPerInch -density 254 2-2.5.png
echo "file '2-2.5.png'" >> framelist.txt
echo "duration 0.5" >> framelist.txt
convert -size 640x480 -gravity center -background black -fill purple label:2.5-3 -units PixelsPerInch -density 254 2.5-3.png
echo "file '2.5-3.png'" >> framelist.txt
echo "duration 0.5" >> framelist.txt
convert -size 640x480 -gravity center -background black -fill purple label:3-3.25 -units PixelsPerInch -density 254 3-3.25.png
echo "file '3-3.25.png'" >> framelist.txt
echo "duration 0.25" >> framelist.txt
convert -size 640x480 -gravity center -background black -fill purple label:3.25-3.5 -units PixelsPerInch -density 254 3.25-3.5.png
echo "file '3.25-3.5.png'" >> framelist.txt
echo "duration 0.25" >> framelist.txt
convert -size 640x480 -gravity center -background black -fill purple label:3.5-3.75 -units PixelsPerInch -density 254 3.5-3.75.png
echo "file '3.5-3.75.png'" >> framelist.txt
echo "duration 0.25" >> framelist.txt
convert -size 640x480 -gravity center -background black -fill purple label:3.75-4 -units PixelsPerInch -density 254 3.75-4.png
echo "file '3.75-4.png'" >> framelist.txt
echo "duration 0.25" >> framelist.txt
convert -size 640x480 -gravity center -background black -fill purple label:4-10 -units PixelsPerInch -density 254 4-10.png
echo "file '4-10.png'" >> framelist.txt
echo "duration 6" >> framelist.txt
convert -size 640x480 -gravity center -background black -fill purple label:10-20 -units PixelsPerInch -density 254 10-20.png
echo "file '10-20.png'" >> framelist.txt
echo "duration 10" >> framelist.txt
echo "file '10-20.png'" >> framelist.txt

ffmpeg -f concat -i framelist.txt -vsync vfr -pix_fmt yuv420p output.mp4



When after that I do ffprobe, I get not expected frame timings :


$ ffprobe -v error -select_streams v:0 -show_frames output.mp4|grep pts_time
pts_time=0.000000
pts_time=2.000000
pts_time=2.520000
pts_time=3.000000
pts_time=3.240000
pts_time=3.520000
pts_time=3.760000
pts_time=4.000000
pts_time=10.000000
pts_time=20.000000



First and second are correct - 0 and 2, however third should be 2.5 instead of 2.52 . Third is once more correct as 3.0, but fourth should be 3.25, not 3.24 . Last 3 are correct as well (4, 10, 20).


What could be the problem, and how do I get the correct frame timings here ?