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Autres articles (26)
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Contribute to translation
13 avril 2011You can help us to improve the language used in the software interface to make MediaSPIP more accessible and user-friendly. You can also translate the interface into any language that allows it to spread to new linguistic communities.
To do this, we use the translation interface of SPIP where the all the language modules of MediaSPIP are available. Just subscribe to the mailing list and request further informantion on translation.
MediaSPIP is currently available in French and English (...) -
Script d’installation automatique de MediaSPIP
25 avril 2011, parAfin de palier aux difficultés d’installation dues principalement aux dépendances logicielles coté serveur, un script d’installation "tout en un" en bash a été créé afin de faciliter cette étape sur un serveur doté d’une distribution Linux compatible.
Vous devez bénéficier d’un accès SSH à votre serveur et d’un compte "root" afin de l’utiliser, ce qui permettra d’installer les dépendances. Contactez votre hébergeur si vous ne disposez pas de cela.
La documentation de l’utilisation du script d’installation (...) -
La sauvegarde automatique de canaux SPIP
1er avril 2010, parDans le cadre de la mise en place d’une plateforme ouverte, il est important pour les hébergeurs de pouvoir disposer de sauvegardes assez régulières pour parer à tout problème éventuel.
Pour réaliser cette tâche on se base sur deux plugins SPIP : Saveauto qui permet une sauvegarde régulière de la base de donnée sous la forme d’un dump mysql (utilisable dans phpmyadmin) mes_fichiers_2 qui permet de réaliser une archive au format zip des données importantes du site (les documents, les éléments (...)
Sur d’autres sites (2870)
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x264 library speed - Altivec vs SSE4 -
15 août 2015, par Asain KujovicI have simple cheap dualcore intel-3ghz-debian and access to super-expensive powerPc7-Aix.
And after few days of strugle, i compiled libx264 and tested it on both computers :
- GCC : library x264 on intel (with SSE2 capabilities) and
- GCC on 16 core powerPc (with altivec).
... and result is that cheap intel is x2 times faster ! (with altivec disabled, intel is 10x times faster)
My question : is this normal ?
Does all other powerPC-users have same results ? Can powerPc-altivec-optimisation of x264 library work at same speed with intel... or MMX/SSE optimisation is officially at least 2 times faster for this library ?I am not interested in multi-thread options. Number of cores and threads are irrelevant. Just simple one-thread x264 encoding with default "medium preset" using rawvideo as source, sse vs altivec.
Maybe native Aix XLC compiler provide better results ? (i managed only gcc to work)
... mac-powerpc-users maybe know something about this.
powrPc7-Aix:$ time (cat raw10sec.y4m |x264 --input-res 720x576 --fps 50 -o /dev/null -)
x264: 64-bit XCOFF
x264 [info]: using cpu capabilities: Altivec
time: real 0m33.559s
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intelDebian:$ time (cat raw10sec.y4m |x264 --input-res 720x576 --fps 50 -o /dev/null -)
x264: ELF 32-bit LSB executable
x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.1 Cache64
time: real 0m16.503s -
x264 library speed - Altivec vs SSE4 -
15 août 2015, par Asain KujovicI have simple cheap dualcore intel-3ghz-debian and access to super-expensive powerPc7-Aix.
And after few days of strugle, i compiled libx264 and tested it on both computers :
- GCC : library x264 on intel (with SSE2 capabilities) and
- GCC on 16 core powerPc (with altivec).
... and result is that cheap intel is x2 times faster ! (with altivec disabled, intel is 10x times faster)
My question : is this normal ?
Does all other powerPC-users have same results ? Can powerPc-altivec-optimisation of x264 library work at same speed with intel... or MMX/SSE optimisation is officially at least 2 times faster for this library ?I am not interested in multi-thread options. Number of cores and threads are irrelevant. Just simple one-thread x264 encoding with default "medium preset" using rawvideo as source, sse vs altivec.
Maybe native Aix XLC compiler provide better results ? (i managed only gcc to work)
... mac-powerpc-users maybe know something about this.
powrPc7-Aix:$ time (cat raw10sec.y4m |x264 --input-res 720x576 --fps 50 -o /dev/null -)
x264: 64-bit XCOFF
x264 [info]: using cpu capabilities: Altivec
time: real 0m33.559s
---
intelDebian:$ time (cat raw10sec.y4m |x264 --input-res 720x576 --fps 50 -o /dev/null -)
x264: ELF 32-bit LSB executable
x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.1 Cache64
time: real 0m16.503s -
PNG sequence to MP4 while looping the animation
19 avril 2016, par user245115So, I’m trying to convert a PNG sequence to an MP4 and loop the animation about 100 times, the only problem is my script doesn’t seem to be working properly.
What the script is supposed to do is get the number of PNG files in the frames directory, and send them to FFMPEG 100 times. Only problem is my script isn’t working right. Here’s the code.
#!/bin/bash
loopcode()
{
tmpdir=frames
picext=png
one=$(ls -l ${tmpdir}/*.png | wc -l)
two=$(echo "${one}+0" | bc -l)
three=0
while [ ! ${loopi} -eq ${looper} ]; do
while [ ! ${three} -eq ${two} ]; do
three=$(printf "%09d" ${two})
echo ${tmpdir}/${three}.${picext}
two=$(echo "${two}+1" | bc -l)
done
two=0
loopi=$(echo "${loopi}+1" | bc -l)
done
}
looper=100
loopi=0
outfile=output.mp4
fps=5
convert frames/*.png frames/%09d.jpeg
loopcode && sleep 5
cat $(loopcode) | ffmpeg -framerate 1/5 -i - -c:v libx264 -r 30 -pix_fmt yuv420p "${outfile}"
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