Hi,
Since we are talking about V4L documentation, I would like to remind
of the timestamps subject since this is a recurrent issue.
The current spec refers to gettimeofday return value for the buffer
timestamps and as already discussed in previous posts, gettimeofday,
introduces a lot of issues,
Hi,
2010/12/18 Theodore Kilgore kilg...@banach.math.auburn.edu:
Does anyone know whether, somewhere in the kernel, there exists a scheme
for detecting whether the external power supply of the computer is using
50hz or 60hz?
The reason I ask:
A certain camera is marketed with Windows
Hi,
2011/8/13 Veda N ved...@gmail.com:
what should be the size of a raw bayer data from the driver.
for 640x480 = i get 640x480x2.
Is this in bytes?
Shouldnt i get more? It shoule be more than yuv422/rgb565
No, that depends on the pixel size, so for 8 bit pixel you should get
640x480
Radek,
Please attach the full dmesg output when starting video capture with
the second camera.
Also increase log verbosity first:
something like this:
rmmod uvcvideo
modprobe uvcvideo trace=65535
You should also refer your capture settings (if I remember MJPG
640x480@24 fps) and that if you use
2009/12/9 Valerio Bontempi valerio.bonte...@gmail.com:
2009/12/9 Paulo Assis pj.as...@gmail.com:
Hi,
I've just responded to a similar issue in the linux-uvc list:
https://lists.berlios.de/pipermail/linux-uvc-devel/2009-December/005391.html
Do you also have insertion errors when modprobing
at 10:53 PM, Paulo Assis pj.as...@gmail.com wrote:
Hi,
Could you please try guvcview ( http://guvcview.berlios.de )
Please post me the output of guvcview --verbose
Best regards,
Paulo
2009/12/9 Jozef Riha jose1...@gmail.com:
Jozef Riha jose1711 at gmail.com writes:
Hello dear ML members
-uvc.berlios.de/#download ?
thank you,
joe
On Wed, Dec 9, 2009 at 11:20 PM, Paulo Assis pj.as...@gmail.com wrote:
Hi, could you try the following:
echo 2 /sys/module/uvcvideo/parameters/quirks
this will set uvcvideo quirks to 2
or you can also try the latest uvcvideo:
http://www.linuxtv.org
/etc/modprobe.d/uvcvideo.conf
options uvcvideo trace=15 quirks=2
regards all,
joe
On Wed, Dec 9, 2009 at 11:53 PM, Paulo Assis pj.as...@gmail.com wrote:
You must reload the driver,
rmmod uvcvideo
modprobe uvcvideo
otherwise the quirks want have any effect.
uvcvideo is now mantained
Hi,
You have to unload the all the old modules before loading the new ones:
http://www.linuxtv.org/wiki/index.php/How_to_Obtain,_Build_and_Install_V4L-DVB_Device_Drivers#First_Use:_Out_with_the_Old.2C_In_with_the_New
otherwise you will get that type of errors.
Regards,
Paulo
2009/12/14 Nicolau
Hi,
I'm currently porting the GPL linux-avc2210k driver (
http://www.freelists.org/archive/linux-avc2210k/ ) to V4L2.
The current version has it's own API that makes it incompatible with
any software except for specific user space apps (avcctrl, avctune)
bundled with the driver.
Since development
Controls State Store/Restore File Format
To: Paulo Assis pj.as...@gmail.com
Cc: Laurent Pinchart laurent.pinch...@ideasonboard.com,
martin_ru...@logitech.com
Hi Paulo,
Clearly you've though quite a bit about this I had not realized
this would be this complex (with ordering issues etc.).
This looks
application, so I would rather not use
any external libs.
IMHO xml would be an overkill in this case, but if the general opinion
is that such format should be used instead I can easily change the
proposal to a xml format.
Regards,
Paulo
Cheers,
Martin
Paulo Assis pj.as...@gmail.com wrote
Hans,
2010/5/23 Hans Verkuil hverk...@xs4all.nl:
On Thursday 20 May 2010 16:42:01 Paulo Assis wrote:
Hi all,
Below is a proposal for the file format to use when storing/restoring
v4l2 controls state.
I've some doubts concerning atomically set controls and string
controls (see below
Hi,
2010/5/23 Hans Verkuil hverk...@xs4all.nl:
On Sunday 23 May 2010 15:40:26 Paulo Assis wrote:
Hans,
2010/5/23 Hans Verkuil hverk...@xs4all.nl:
On Thursday 20 May 2010 16:42:01 Paulo Assis wrote:
Hi all,
Below is a proposal for the file format to use when storing/restoring
v4l2
controls since i don't
have any hardware that supports them.
Best Regards,
Paulo
[RFC] V4L2 Controls State Store/Restore File Format
AUTHORS: Paulo Assis pj.as...@gmail.com
VERSION: 0.0.2
ABSTRACT
This document proposes a standard for the file format used by v4l2 applications
to store/restore
2010/6/10 Jean-Francois Moine moin...@free.fr:
On Thu, 10 Jun 2010 03:24:05 + (UTC)
jiajun zhujia...@gmail.com wrote:
I'm currently using the V4L-DVB driver to control a few logitech
webcams and playstation eye cameras on a Gubuntu system.
Everything works just fine except one thing:
PLEASE NO,
The current use of ktime is much better, timestamps are perfectly in
sync and will not suffer from time shifts if the clock value changes.
PLEASE just leave it like it is now.
Best Regards,
Paulo
2010/6/10 Jean-Francois Moine moin...@free.fr:
Hi Mauro,
The following changes since
Hi,
2010/6/10 Jiajun Zhu zhujia...@gmail.com:
Thanks for the discussion.
Based on my testing, the image timestamps or ktime is the system uptime in
nanosecond, is this correct?
For my application, I need to synchronize the camera image with other data
which are all timestamped by
For the list (again)
-- Forwarded message --
From: Paulo Assis pj.as...@gmail.com
Date: 2013/6/11
Subject: Re:
To: phil rosenberg philip_rosenb...@yahoo.com
Cc: linux-media@vger.kernel.org linux-media@vger.kernel.org
Hi,
make sure you are streaming in YUYV format and not in MJPG
in either the webcam's UVC support or the UVC
driver? If so I presume there is no likely quick workaround.
Phil
From: Paulo Assis pj.as...@gmail.com
To: phil rosenberg philip_rosenb...@yahoo.com
Cc: linux-media@vger.kernel.org linux-media@vger.kernel.org
-
From: Paulo Assis pj.as...@gmail.com
To: phil rosenberg philip_rosenb...@yahoo.com
Cc: linux-media@vger.kernel.org linux-media@vger.kernel.org
Sent: Tuesday, 11 June 2013, 11:13
Subject: Re: Corrupt Raw webcam data
Hi,
You should select YUYV before disabling the video processing.
So
Hi,
BGR3, RGB3, YU12 and YV12 are provided through libv4l, the original
unconverted stream format provided through uvcvideo driver is YUYV, if
this is fine then this is probably an issue with libv4l.
Regards,
Paulo
2012/4/5 Chris Rankin ranki...@googlemail.com:
Hi,
I have a UVC video device,
Hi,
From what you describe I would say that during conversion a YUYV (2
bytes per pixel) size (be it a buffer or loop iterations) is being
used for RGB3 (3 bytes per pixel), so you only get 2/3 of the picture.
Does this happen in any resolution ?
Regards,
Paulo
2012/4/5 Paulo Assis pj.as
Karl Hi,
I'm using a 3.2 kernel and I haven't notice this problem, can you
check the exact version that causes it.
Regards,
Paulo
2012/5/2 Karl Kiniger karl.kini...@med.ge.com:
Please can someone shed a little light on this?
Greatly appreciated,
Karl
On Tue 120424, Karl Kiniger wrote:
On Wed 120502, Paulo Assis wrote:
Karl Hi,
I'm using a 3.2 kernel and I haven't notice this problem, can you
check the exact version that causes it.
Regards,
Paulo
--
To unsubscribe from this list: send the line unsubscribe linux-media in
the body of a message to majord...@vger.kernel.org
, but they do increase functionality
to some extent.
Anyway if this was just a libwebcam issue, guvcview should still be
able to add the controls, and apparently that's failing also.
Best regards,
Paulo
2012/5/2 Karl Kiniger karl.kini...@med.ge.com:
On Wed 120502, Paulo Assis wrote:
karl,
I've run
OK, so UVCIOC_CTRL_ADD is no longer available, now we have:
UVCIOC_CTRL_MAP and UVCIOC_CTRL_QUERY, so I guess some changes are
needed, I'll try to fix this ASAP.
Regards,
Paulo
2012/5/2 Paulo Assis pj.as...@gmail.com:
Hi,
yes, libwebcam depends on uvcvideo.h, I've only added this as a patch
that and add add them to 0.2.
I still need to check with him how he wants to handle the 0.3 version,
since it has a lot of new code ( and some extra apps ).
Regards,
Paulo
2012/5/3 Karl Kiniger karl.kini...@med.ge.com:
Hi Paulo,
On Wed 120502, Paulo Assis wrote:
OK, so UVCIOC_CTRL_ADD is no longer
make an initial git repo available I can rebase on top
of that and then send the patches with git send-email (so 1 patch / mail)
for review?
Either way thanks for working on this!
Regards,
Hans
On 05/03/2012 04:17 PM, Paulo Assis wrote:
Karl Hi,
I'm setting up a libwebcam git repo
Hi,
This bug also causes the camera to crash when changing fps in
guvcview, uvc devices (at least all the ones I tested) require the
stream to be restarted for fps to change, so in the case of this
driver after STREAMOFF the camera just becomes unresponsive.
Regards,
Paulo
2012/5/22 Lluís Batlle
Hi,
2013/11/11 Laurent Pinchart laurent.pinch...@ideasonboard.com:
Hi Paulo,
On Thursday 10 October 2013 11:27:37 Paulo Assis wrote:
Hi,
just want t know the current state on this series.
I'm currently adding h264 stream preview support to guvcview.
It's already working fine on uvc 1.1
Hi,
I'm repeating myself, but this seems the proper place to post this.
This patch causes a regression with the logitech c930e.
Please see comments below:
2013/11/10 Laurent Pinchart laurent.pinch...@ideasonboard.com:
Hi Pawel,
Thank you for the patch.
On Friday 30 August 2013 11:17:02
Hi,
The uvcdynctrl utility is part of the libwebcam project:
http://www.quickcamteam.net/software/libwebcam
But given that libwebcam is unmaintained and not used by anything AFAIK, I'm
patching
uvcdynctrl to no longer need it. The plan is to add uvcdynctrl to libv4l
soon, as that
is
Hi,
linuxtv uses mercurial (or git) not svn, please check the how-to:
http://www.linuxtv.org/wiki/index.php/How_to_Obtain,_Build_and_Install_V4L-DVB_Device_Drivers
regards,
Paulo
2010/2/8 loody milo...@gmail.com:
Dear all:
I hear UVC is change its repository to linxutv.
But I tried several
Laurent,
That's not enough to prevent a kernel crash. The driver can try to dereference
ctrl-data if ctrl-info isn't NULL. You should only set ctrl-info if
allocationg succeeds. Something like
ctrl-data = kmalloc(ctrl-info-size * UVC_CTRL_NDATA, GFP_KERNEL);
if (ctrl-data ==
Hi,
guvcview just handles this like any other V4L2 device. You should look
at the driver in this case, and check what it does when a
VIDIOC_STREAMOFF is received.
Regards,
Paulo
PS: adding linux media to CC
2014/1/1 Ayoub, Hani hani.ay...@intel.com:
Hi,
I’m trying to bring up a device which
Hi,
2014-03-05 23:01 GMT+00:00 William Manley w...@williammanley.net:
Hi All
I've been attempting to use the Logitech C920 with the uvcvideo driver.
I set the controls with v4l2-ctl but some of them change during
VIDIOC_STREAMON. My understanding is that the values of controls should
be
I referring to the following bug:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1362358
I've run some tests and after increasing verbosity for uvcvideo, I get:
EOF on empty payload
this seems consistent with the zero size frames returned by the driver.
After VIDIOC_DQBUF | VIDIOC_QBUF, I
2014-09-30 9:50 GMT+01:00 Paulo Assis pj.as...@gmail.com:
I referring to the following bug:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1362358
I've run some tests and after increasing verbosity for uvcvideo, I get:
EOF on empty payload
this seems consistent with the zero size frames
(debian), virtual formats (rgb3,
bgr3, yu12, yv12) are not working with that version.
Regards,
Paulo
2014-09-30 14:12 GMT+01:00 Nicolas Dufresne nicolas.dufre...@collabora.com:
Le 2014-09-30 04:50, Paulo Assis a écrit :
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1362358
I've run some
Laurent hi,
2014-09-30 23:31 GMT+01:00 Laurent Pinchart laurent.pinch...@ideasonboard.com:
Hi Paulo,
Thank you for investigation this.
On Tuesday 30 September 2014 13:56:15 Paulo Assis wrote:
Ok,
so I've set a workaround in guvcview, it now uses the length filed if
bytesused is set
...@ideasonboard.com:
Hi Paulo,
On Wednesday 01 October 2014 11:48:26 Paulo Assis wrote:
Laurent hi,
2014-09-30 23:31 GMT+01:00 Laurent Pinchart:
Hi Paulo,
Thank you for investigation this.
On Tuesday 30 September 2014 13:56:15 Paulo Assis wrote:
Ok,
so I've set a workaround
I've add to change guvcview so that it now generates it's own
monotonic timestamps, kernel timestamps (uvcvideo at least), caused a
similar problem, e.g:
I would get a couple of frames with correct timestamps, then I would
get at least one with a value lower than the rest, this caused
playback to
Hi,
2014-11-04 23:32 GMT+00:00 Sakari Ailus sakari.ai...@iki.fi:
Sakari Ailus wrote:
yavta does, for example, print both the monotonic timestamp from the buffer
and the time when the buffer has been dequeued:
URL:http://git.ideasonboard.org/yavta.git
$ yavta -c /dev/video0
should
to test
anything else for the next coule of days.
Regards,
Paulo
2014-11-05 14:05 GMT+00:00 Laurent Pinchart laurent.pinch...@ideasonboard.com:
Hi Paulo,
On Wednesday 05 November 2014 10:13:45 Paulo Assis wrote:
2014-11-04 23:32 GMT+00:00 Sakari Ailus sakari.ai...@iki.fi:
Sakari Ailus wrote
-- Forwarded message --
From: Paulo Assis <pj.as...@gmail.com>
Date: 2017-04-20 12:04 GMT+01:00
Subject: uvcvideo extension controls
To: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Cc: Linux Media Mailing List <linux-media@vger.kernel.org>, aUDIo
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