video4linux loopback device
Hi,
Any chance that the video4linux loopback device will be integrated in the main video4linux distribution and included in the kernel?
http://www.lavrsen.dk/foswiki/bin/view/Motion/VideoFourLinuxLoopbackDevice
or
http://sourceforge.net/projects/v4l2vd/
or
http://code.google.com/p/v4l2loopback/
This enables userspace postprocessors to feed the altered stream to applications like amsn and skype for videochats.
Folkert van Heusden
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Em Fri, 17 Jul 2009 19:41:01 +0200
Folkert van Heusden <[email protected]> escreveu:
Quoted 11 lines
Hi,
Any chance that the video4linux loopback device will be integrated in the main video4linux distribution and included in the kernel?
http://www.lavrsen.dk/foswiki/bin/view/Motion/VideoFourLinuxLoopbackDevice
or
http://sourceforge.net/projects/v4l2vd/
or
http://code.google.com/p/v4l2loopback/
This enables userspace postprocessors to feed the altered stream to applications like amsn and skype for videochats.
If the postprocessor application is LGPL, the better is to add it at libv4l.
Cheers,
Mauro
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Quoted 10 lines
Quoted 9 lines
Any chance that the video4linux loopback device will be integrated in the main video4linux distribution and included in the kernel?
http://www.lavrsen.dk/foswiki/bin/view/Motion/VideoFourLinuxLoopbackDevice
or
http://sourceforge.net/projects/v4l2vd/
or
http://code.google.com/p/v4l2loopback/
This enables userspace postprocessors to feed the altered stream to applications like amsn and skype for videochats.If the postprocessor application is LGPL, the better is to add it at libv4l.
I don't agree as the postprocessor implements fun-effects: warhol, puzzle, circles, wobble, etc.
Folkert van Heusden
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Quoted 23 lines · Folkert van Heusden
Quoted 10 lines
Quoted 9 lines
Any chance that the video4linux loopback device will be integrated in the main video4linux distribution and included in the kernel?
http://www.lavrsen.dk/foswiki/bin/view/Motion/VideoFourLinuxLoopbackDevice
or
http://sourceforge.net/projects/v4l2vd/
or
http://code.google.com/p/v4l2loopback/
This enables userspace postprocessors to feed the altered stream to applications like amsn and skype for videochats.If the postprocessor application is LGPL, the better is to add it at libv4l.
I don't agree as the postprocessor implements fun-effects: warhol, puzzle, circles, wobble, etc.
Folkert van Heusden
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Quoted 5 lines
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and how one can make skype to get pictue from libv4l or alter the picture which application is getting through libv4l? again some proxy is needed here.
vasaka
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Quoted 9 lines
Quoted 9 lines
Quoted 9 lines
Quoted 9 lines
Any chance that the video4linux loopback device will be integrated in the main video4linux distribution and included in the kernel?
http://www.lavrsen.dk/foswiki/bin/view/Motion/VideoFourLinuxLoopbackDevice
or
http://sourceforge.net/projects/v4l2vd/
or
http://code.google.com/p/v4l2loopback/
This enables userspace postprocessors to feed the altered stream to applications like amsn and skype for videochats.
Quoted 8 lines
Quoted 4 lines
Quoted 1 line
If the postprocessor application is LGPL, the better is to add it at libv4l.
I don't agree as the postprocessor implements fun-effects: warhol, puzzle, circles, wobble, etc.
and how one can make skype to get pictue from libv4l or alter the picture which application is getting through libv4l? again some proxy is needed here.
Correct so we definately need some external video loopback device. It gives as a much greater flexibility.
Folkert van Heusden
Signature · 9 lines
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Em Fri, 24 Jul 2009 17:07:29 +0200
Folkert van Heusden <[email protected]> escreveu:
Quoted 14 lines
Quoted 14 lines
Quoted 13 lines
Quoted 10 lines
Quoted 9 lines
Any chance that the video4linux loopback device will be integrated in the main video4linux distribution and included in the kernel?
http://www.lavrsen.dk/foswiki/bin/view/Motion/VideoFourLinuxLoopbackDevice
or
http://sourceforge.net/projects/v4l2vd/
or
http://code.google.com/p/v4l2loopback/
This enables userspace postprocessors to feed the altered stream to applications like amsn and skype for videochats.If the postprocessor application is LGPL, the better is to add it at libv4l.
I don't agree as the postprocessor implements fun-effects: warhol, puzzle, circles, wobble, etc.
Quoted 6 lines
Quoted 3 lines
and how one can make skype to get pictue from libv4l or alter the picture which application is getting through libv4l? again some proxy is needed here.
Correct so we definately need some external video loopback device. It gives as a much greater flexibility.
libv4l intercepts V4L2 calls by using LD_PRELOAD. Without it, skype doesn't work with most of the cams, since it doesn't support several of the output formats common on most cameras. I have lots of different webcam models here. I think only one or two are directly supported by skype.
libv4l already have some postprocessor effects (currently limited to image enhancements like auto-gain/auto-bright and similar stuff), but I don't see why not adding there other effects including the fun ones.
Hans has several plans of improvements for it, including more post-processing effects and the ability of duplicating a video to more than one application at the same time.
The big problem with a v4l2 loopback is that you're adding something that it is not proper to kernel, since it were not designed to be a proxy between two userspace applications. This is the space where libraries were designed. Due to that, you can affect the machine performance, due to the usage of kernel memory barriers.
Also, you'll likely add extra buffering costs of copying control data and stream mapping in order to access it from/to kernel where you could just pass a buffer between the effect processors and do a simple function call.
Cheers,
Mauro
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Quoted 43 lines · Mauro Carvalho Chehab
Em Fri, 24 Jul 2009 17:07:29 +0200
Folkert van Heusden <[email protected]> escreveu:Quoted 14 lines
Quoted 14 lines
Quoted 13 lines
Quoted 10 lines
Quoted 9 lines
Any chance that the video4linux loopback device will be integrated in the main video4linux distribution and included in the kernel?
http://www.lavrsen.dk/foswiki/bin/view/Motion/VideoFourLinuxLoopbackDevice
or
http://sourceforge.net/projects/v4l2vd/
or
http://code.google.com/p/v4l2loopback/
This enables userspace postprocessors to feed the altered stream to applications like amsn and skype for videochats.If the postprocessor application is LGPL, the better is to add it at libv4l.
I don't agree as the postprocessor implements fun-effects: warhol, puzzle, circles, wobble, etc.
Quoted 6 lines
Quoted 3 lines
and how one can make skype to get pictue from libv4l or alter the picture which application is getting through libv4l? again some proxy is needed here.
Correct so we definately need some external video loopback device. It gives as a much greater flexibility.
libv4l intercepts V4L2 calls by using
LD_PRELOAD. Without it, skype doesn't work with most of the cams, since it doesn't support several of the output formats common on most cameras. I have lots of different webcam models here. I think only one or two are directly supported by skype.libv4l already have some postprocessor effects (currently limited to image enhancements like auto-gain/auto-bright and similar stuff), but I don't see why not adding there other effects including the fun ones.
Hans has several plans of improvements for it, including more post-processing effects and the ability of duplicating a video to more than one application at the same time.
The big problem with a v4l2 loopback is that you're adding something that it is not proper to kernel, since it were not designed to be a proxy between two userspace applications. This is the space where libraries were designed. Due to that, you can affect the machine performance, due to the usage of kernel memory barriers.
Quoted 9 lines
Also, you'll likely add extra buffering costs of copying control data and stream mapping in order to access it from/to kernel where you could just pass a buffer between the effect processors and do a simple function call.
Cheers,
Mauro
Sounds interesting. will libv4l have ability to provide video from sources other than v4l2 devices?
One of the things I want to achieve is to provide talking head to video chatting programs instead of usual video stream.
vasaka
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Em Fri, 24 Jul 2009 19:10:07 +0300
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Quoted 4 lines
Sounds interesting. will libv4l have ability to provide video from sources other than v4l2 devices?
One of the things I want to achieve is to provide talking head to video chatting programs instead of usual video stream.
I'm not sure if Hans has plans for it. You may talk with him about it
Cheers,
Mauro
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Quoted 2 lines · Folkert van Heusden
Any chance that the video4linux loopback device will be integrated in the main video4linux distribution and included in the kernel?
Why don't we focus on something like JACK[0], but for video, like videojack[1]. This brings all this to userspace and we can pipe video into and out of applications as easily as we're doing with audio with JACK.
This seems more like a final solution to me.
[0]http://jackaudio.org/ [1]http://www.piksel.no/pwiki/VideoJack [2]http://www.linuxmao.org/tikiwiki/img/wiki_up/patchage.png
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