leejaekyung/libv4l2cam

Automatically exported from code.google.com/p/libv4l2cam

libv4l2cam's Issues

select timeout while you can get video size or fps, why?

What steps will reproduce the problem?
1.Doing capturing video in a Virtual Manchine via v4l2 driver
2.Open another program for example firefox,and then the capturing program 
returned "select error 0"
3.Try to get video size,and it will success.

What is the expected output? What do you see instead?
I think it the quest for video size should failed because you cann't get access 
to a webcam just because select operation returns 0;

What version of the product are you using? On what operating system?
I use the v4l2 example namely "capture.c"， and did this on ubuntu 10.10

Please provide any additional information below.
Can I put some my log here? It just like:

main.cpp,594:[2012-04-01 17:09:00] /dev/video0:select error: 0
main.cpp,594:[2012-04-01 17:09:02] /dev/video0:select error: 0
main.cpp,836:[2012-04-01 17:09:02] /dev/video0:getFrameFreq over
main.cpp,594:[2012-04-01 17:09:04] /dev/video0:select error: 0
main.cpp,594:[2012-04-01 17:09:06] /dev/video0:select error: 0
main.cpp,983:[2012-04-01 17:09:07] /dev/video0:getFramSize over
main.cpp,594:[2012-04-01 17:09:08] /dev/video0:select error: 0
main.cpp,594:[2012-04-01 17:09:10] /dev/video0:select error: 0
main.cpp,594:[2012-04-01 17:09:12] /dev/video0:select error: 0
main.cpp,594:[2012-04-01 17:09:14] /dev/video0:select error: 0
main.cpp,594:[2012-04-01 17:09:16] /dev/video0:select error: 0
main.cpp,594:[2012-04-01 17:09:18] /dev/video0:select error: 0
main.cpp,594:[2012-04-01 17:09:20] /dev/video0:select error: 0
main.cpp,594:[2012-04-01 17:09:22] /dev/video0:select error: 0
main.cpp,594:[2012-04-01 17:09:24] /dev/video0:select error: 0
main.cpp,594:[2012-04-01 17:09:26] /dev/video0:select error: 0
main.cpp,594:[2012-04-01 17:09:28] /dev/video0:select error: 0
main.cpp,594:[2012-04-01 17:09:30] /dev/video0:select error: 0
main.cpp,594:[2012-04-01 17:09:32] /dev/video0:select error: 0
main.cpp,594:[2012-04-01 17:09:34] /dev/video0:select error: 0
main.cpp,836:[2012-04-01 17:09:35] /dev/video0:getFrameFreq over
main.cpp,594:[2012-04-01 17:09:36] /dev/video0:select error: 0
main.cpp,594:[2012-04-01 17:09:38] /dev/video0:select error: 0
main.cpp,594:[2012-04-01 17:09:40] /dev/video0:select error: 0
main.cpp,618:[2012-04-01 17:09:44] /dev/video0:capture stopped

when "getFrameSize" and "getFrameFreq" over, it indicates that the operation is 
successful.

Original issue reported on code.google.com by [email protected] on 1 Apr 2012 at 9:31

Not using y1 in RGB conversion

Lines 788-790 in libcam.cpp:
 r = y0 + (1.370705 * (v-128));
 g = y0 - (0.698001 * (v-128)) - (0.337633 * (u-128));
 b = y0 + (1.732446 * (u-128));

These are an exact copy of 771-773.  I would guess you meant to change the y0 
to y1 after the cut/paste.

Original issue reported on code.google.com by [email protected] on 20 Sep 2010 at 12:49

FPS has no effect

I'm setting various (allowable) frame rates (FPS), but I don't notice a 
difference. FPS=1 and FPS=24 appear to give the same results. I tried a couple 
of different cameras without luck. How could I check for sure that v4l is using 
the correct frame rate? 

Original issue reported on code.google.com by [email protected] on 17 Jul 2011 at 11:42

loss of sync between left and right live cam

What steps will reproduce the problem?
1. Make the source libv4lwcam and ocv examples
2. Using opencv2.4.8
3. Run example two

What is the expected output? What do you see instead?
It is expected to see live right end left cameras, but clearly they are not 
sync.

What version of the product are you using? On what operating system?
Using last version of libv4l2can rev167 (21 October, 2014), Ubuntu 12.04 64bits 
and opencv2.4.8

Please provide any additional information below.
If you block the one of the two camera, the auto brightness change the order of 
what camera is ahead of sync.

please see my desktop record of the issue at:
http://youtu.be/fzxOIPgcKUo

Original issue reported on code.google.com by [email protected] on 21 Oct 2014 at 3:59

No streaming functionality

What steps will reproduce the problem?
1. v4lstereo is fantastic in embedded applications, but
has no way to transfer the data back to a controlling machine.

What version of the product are you using? On what operating system?
Latest SVN (r64) on Ubuntu Karmic i386 and armel (on BeagleBoard)
Minoru webcam

Please provide any additional information below.
The following patch should add streaming support to v4lstereo r64.  It adds 
a build dependencies:
libgstreamer-plugins-base0.10-dev
libgst-dev 

Please be gentle, this is my first real work with C++ and so I couldn't 
figure out how to selectively disable stuff at build time. I just modified 
the makefile to add the required support flags.  The patch does not add 
much overhead to program, but could probably be done in a more efficient 
way.
The streams are raw jpegs over a tcp socket - the gstreamer pipeline could 
be easily modified to use rtsp, but latency is critical for my particular 
application (UAV).
The streams can easily be run with the gst-launch  command printer out at 
runtime.
I also added an option to explicitly run the program headless, as there are 
potential use cases where you want both local display and streaming.
I tried to stick to the style of the code as much as possible.
I hope this is of use to other people, and many thanks to the authors for 
this great application.
If there are any modifications (probably many) which you would like to see 
before inclusion, please let me know!
Gareth R

Original issue reported on code.google.com by [email protected] on 30 Nov 2009 at 4:06

Attachments:

• streaming.patch

Two cameras at the same time only work in 640x480 resolution

What steps will reproduce the problem?
1. In two.cpp, use something other than 640x480 for ww/hh, for instance 160x120
2. compile
3. run ./two

What is the expected output? What do you see instead?
I would expect the same result as with 640x480 resolution, just in another
resolution. Instead i see nothing. This works for a single camera, for
instance when changing the resolution in ocv/test.cpp, but not in
ocv/two.cpp (or in my own application for that matter).

What version of the product are you using? On what operating system?
I believe I'm using the latest version as of july 2009. I'm running Ubuntu
9.04 x64.

Please provide any additional information below.
As a side note, it would be nice to be able to change the resolution after
the Camera has been created. Something like c.reconfigure(width,height,fps)
would be great. Thanks for this great library!

Original issue reported on code.google.com by [email protected] on 8 Jul 2009 at 5:37

Ubuntu 11.04 - libcvm57.deb - "The package is of bad qaulity"

What steps will reproduce the problem?
1. Download and install libcvm57.deb on Ubuntu 11.04
2.
3.

What is the expected output? What do you see instead?

Ubuntu Software Center reports "The package is of bad quality"

The installation of a package which violates the quality standards isn't 
allowed. This could cause serious problems on your computer. Please contact the 
person or organisation who provided this package file and include the details 
beneath.

What version of the product are you using? On what operating system?
Latest version just downloaded. Ubuntu 11.04 64-bit.

Please provide any additional information below.

Lintian check results for /home/mac/Downloads/libcvm57.deb:
E: libcvm57: wrong-file-owner-uid-or-gid usr/ 1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/include/ 1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/include/libcvm57/ 1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/include/libcvm57/arrays.cpp 
1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/include/libcvm57/blas.h 1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/include/libcvm57/cmatrix.cpp 
1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/include/libcvm57/cvector.cpp 
1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/include/libcvm57/cvm.h 1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/include/libcvm57/globals.cpp 
1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/include/libcvm57/rmatrix.cpp 
1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/include/libcvm57/rvector.cpp 
1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/include/libcvm57/scmatrix.cpp 
1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/include/libcvm57/srmatrix.cpp 
1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/include/libcvm57/utils.cpp 
1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/lib/ 1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/lib/libcvm_em64t.a 1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/lib/libcvm_em64t.so 1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/lib/libcvm_em64t_debug.a 1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/lib/libcvm_em64t_debug.so 1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/lib/libcvm_em64t_ilp64.a 1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/lib/libcvm_em64t_ilp64.so 1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/lib/libcvm_em64t_ilp64_debug.a 
1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/lib/libcvm_em64t_ilp64_debug.so 
1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/lib/libcvm_ia32.a 1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/lib/libcvm_ia32.so 1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/lib/libcvm_ia32_debug.a 1000/1000

E: libcvm57: wrong-file-owner-uid-or-gid usr/lib/libcvm_ia32_debug.so 1000/1000

E: libcvm57: arch-independent-package-contains-binary-or-object 
usr/lib/libcvm_em64t.a

E: libcvm57: arch-independent-package-contains-binary-or-object 
usr/lib/libcvm_em64t.so

E: libcvm57: arch-independent-package-contains-binary-or-object 
usr/lib/libcvm_em64t_debug.a

E: libcvm57: arch-independent-package-contains-binary-or-object 
usr/lib/libcvm_em64t_debug.so

E: libcvm57: arch-independent-package-contains-binary-or-object 
usr/lib/libcvm_em64t_ilp64.a

E: libcvm57: arch-independent-package-contains-binary-or-object 
usr/lib/libcvm_em64t_ilp64.so

E: libcvm57: arch-independent-package-contains-binary-or-object 
usr/lib/libcvm_em64t_ilp64_debug.a

E: libcvm57: arch-independent-package-contains-binary-or-object 
usr/lib/libcvm_em64t_ilp64_debug.so

E: libcvm57: arch-independent-package-contains-binary-or-object 
usr/lib/libcvm_ia32.a

E: libcvm57: arch-independent-package-contains-binary-or-object 
usr/lib/libcvm_ia32.so

E: libcvm57: arch-independent-package-contains-binary-or-object 
usr/lib/libcvm_ia32_debug.a

E: libcvm57: arch-independent-package-contains-binary-or-object 
usr/lib/libcvm_ia32_debug.so

Original issue reported on code.google.com by [email protected] on 3 May 2011 at 12:16