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The Great Big Beautiful Tomorrow
28 octobre 2011, par
Mis à jour : Octobre 2011
Langue : English
Type : Texte
Autres articles (28)
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List of compatible distributions
26 avril 2011, parThe table below is the list of Linux distributions compatible with the automated installation script of MediaSPIP. Distribution nameVersion nameVersion number Debian Squeeze 6.x.x Debian Weezy 7.x.x Debian Jessie 8.x.x Ubuntu The Precise Pangolin 12.04 LTS Ubuntu The Trusty Tahr 14.04
If you want to help us improve this list, you can provide us access to a machine whose distribution is not mentioned above or send the necessary fixes to add (...) -
MediaSPIP v0.2
21 juin 2013, parMediaSPIP 0.2 is the first MediaSPIP stable release.
Its official release date is June 21, 2013 and is announced here.
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 (...) -
Pas question de marché, de cloud etc...
10 avril 2011Le vocabulaire utilisé sur ce site essaie d’éviter toute référence à la mode qui fleurit allègrement
sur le web 2.0 et dans les entreprises qui en vivent.
Vous êtes donc invité à bannir l’utilisation des termes "Brand", "Cloud", "Marché" etc...
Notre motivation est avant tout de créer un outil simple, accessible à pour tout le monde, favorisant
le partage de créations sur Internet et permettant aux auteurs de garder une autonomie optimale.
Aucun "contrat Gold ou Premium" n’est donc prévu, aucun (...)
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How to change mjpeg to yuyv422 from a webcam to a v4l2loopback ?
3 janvier 2020, par Dev NullBackstory : One livestreaming site I use isn’t smart enough to detect the capabilities of my webcam (Logitech Brio, 4k), and instead just uses the default frames per second settings, which is 5fps.
(full solution walk-through in the answer)
The best solution I could think of (besides changing livestream providers) was to create a loopback virtual webcam using v4l2loopback that I could force to have the exact settings I wanted to use on that livestream site.
For the brio, the higher frame rates come with mjpeg, not the default yuyv.
Problem 1 :
I could easily read mjpeg, but unfortunately kept banging my head against the wall because v4l2loopback evidently only wanted yuyv.
I tried things like :
ffmpeg -f v4l2 \
-input_format mjpeg \
-framerate 30 \
-video_size 1280x720 \
-i /dev/video0 \
-vcodec copy \
-f v4l2 /dev/video6and
ffmpeg -f v4l2 \
-input_format mjpeg \
-framerate 30 \
-video_size 1280x720 \
-i /dev/video0 \
-vcodec yuyv422 \ # this line changed (even tried "copy")
-f v4l2 /dev/video6But they wouldn’t work. I got errors like :
Unknown V4L2 pixel format equivalent for yuvj422p
and
...deprecated pixel format used, make sure you did set range correctly...
...V4L2 output device supports only a single raw video stream...
Eventually I got this to work :
ffmpeg -f v4l2 \
-input_format mjpeg \
-framerate 30 \
-video_size 1280x720 \
-i /dev/video0 \
-pix_fmt yuyv422 \ # The winning entry
-f v4l2 /dev/video6Problem 2
The next problem was getting chrome to see the virtual webcam. It worked correctly with guvcview, and on firefox I could use webcam testing sites and it would pick the virtual camera up without a problem.
Turns out google, in it’s overly-protective nature (while it’s siphoning off all our data, btw), doesn’t want to use webcams that can be read and written to.
So when starting v4l2loopback you have to tell it to announce that it’s "read only" to consumers like chrome.
Here’s the exact modprobe I use that works :
sudo modprobe v4l2loopback devices=1 exclusive_caps=1