release/close capture of camera
Clash Royale CLAN TAG#URR8PPP
I have opened webcam for capturing using OpenCV in C++.
Then I stopped the program using CTRL+Z;
The webcam could not turn off, Because was not defined in program. And I can not start my program again because the capture program is still using webcam and is busy.
Error:
libv4l2: error setting pixformat: Device or resource busy
HIGHGUI ERROR: libv4l unable to ioctl S_FMT
...
I found the process id using lsof|grep libv4l2:
capture 5591 mylove mem REG 8,8 52584 1737777 /usr/lib64/libv4l2.so.0.0.0
and tried to close the capture using kill 5591 and also pkill capture using normal user and root user. But the camera LED is still turned on and my program can not start.
What is fastest and best method to release/close the camera?
camera v4l opencv
edited Oct 10 '16 at 4:15
Mongrel
2,10331747
asked Dec 16 '14 at 17:53
Mohammad EtemaddarMohammad Etemaddar
6,70651730
add a comment |
I have opened webcam for capturing using OpenCV in C++.
Then I stopped the program using CTRL+Z;
The webcam could not turn off, Because was not defined in program. And I can not start my program again because the capture program is still using webcam and is busy.
Error:
libv4l2: error setting pixformat: Device or resource busy
HIGHGUI ERROR: libv4l unable to ioctl S_FMT
...
I found the process id using lsof|grep libv4l2:
capture 5591 mylove mem REG 8,8 52584 1737777 /usr/lib64/libv4l2.so.0.0.0
and tried to close the capture using kill 5591 and also pkill capture using normal user and root user. But the camera LED is still turned on and my program can not start.
What is fastest and best method to release/close the camera?
camera v4l opencv
edited Oct 10 '16 at 4:15
Mongrel
2,10331747
asked Dec 16 '14 at 17:53
Mohammad EtemaddarMohammad Etemaddar
6,70651730
Could you add the output ofps -eo uid,state,comm? The line with your process (capture) would be enough.
– John WH Smith
Dec 16 '14 at 23:33
Of course, Now I have not OpenCV on my System. I'll put it when I install if I remember. Thank you.
– Mohammad Etemaddar
Oct 10 '16 at 11:44
add a comment |
I have opened webcam for capturing using OpenCV in C++.
Then I stopped the program using CTRL+Z;
The webcam could not turn off, Because was not defined in program. And I can not start my program again because the capture program is still using webcam and is busy.
Error:
libv4l2: error setting pixformat: Device or resource busy
HIGHGUI ERROR: libv4l unable to ioctl S_FMT
...
I found the process id using lsof|grep libv4l2:
capture 5591 mylove mem REG 8,8 52584 1737777 /usr/lib64/libv4l2.so.0.0.0
and tried to close the capture using kill 5591 and also pkill capture using normal user and root user. But the camera LED is still turned on and my program can not start.
What is fastest and best method to release/close the camera?
camera v4l opencv
edited Oct 10 '16 at 4:15
Mongrel
2,10331747
asked Dec 16 '14 at 17:53
Mohammad EtemaddarMohammad Etemaddar
6,70651730
I have opened webcam for capturing using OpenCV in C++.
Then I stopped the program using CTRL+Z;
The webcam could not turn off, Because was not defined in program. And I can not start my program again because the capture program is still using webcam and is busy.
Error:
libv4l2: error setting pixformat: Device or resource busy
HIGHGUI ERROR: libv4l unable to ioctl S_FMT
...
I found the process id using lsof|grep libv4l2:
capture 5591 mylove mem REG 8,8 52584 1737777 /usr/lib64/libv4l2.so.0.0.0
and tried to close the capture using kill 5591 and also pkill capture using normal user and root user. But the camera LED is still turned on and my program can not start.
What is fastest and best method to release/close the camera?
camera v4l opencv
camera v4l opencv
edited Oct 10 '16 at 4:15
Mongrel
2,10331747
asked Dec 16 '14 at 17:53
Mohammad EtemaddarMohammad Etemaddar
6,70651730
edited Oct 10 '16 at 4:15
Mongrel
2,10331747
asked Dec 16 '14 at 17:53
Mohammad EtemaddarMohammad Etemaddar
6,70651730
edited Oct 10 '16 at 4:15
Mongrel
2,10331747
edited Oct 10 '16 at 4:15
Mongrel
2,10331747
edited Oct 10 '16 at 4:15
Mongrel
2,10331747
2,10331747
asked Dec 16 '14 at 17:53
Mohammad EtemaddarMohammad Etemaddar
6,70651730
asked Dec 16 '14 at 17:53
Mohammad EtemaddarMohammad Etemaddar
6,70651730
asked Dec 16 '14 at 17:53
Mohammad EtemaddarMohammad Etemaddar
6,70651730
6,70651730
Could you add the output ofps -eo uid,state,comm? The line with your process (capture) would be enough.
– John WH Smith
Dec 16 '14 at 23:33
Of course, Now I have not OpenCV on my System. I'll put it when I install if I remember. Thank you.
– Mohammad Etemaddar
Oct 10 '16 at 11:44
add a comment |
Could you add the output ofps -eo uid,state,comm? The line with your process (capture) would be enough.
– John WH Smith
Dec 16 '14 at 23:33
Of course, Now I have not OpenCV on my System. I'll put it when I install if I remember. Thank you.
– Mohammad Etemaddar
Oct 10 '16 at 11:44
Could you add the output of
ps -eo uid,state,comm? The line with your process (capture) would be enough.– John WH Smith
Dec 16 '14 at 23:33
Could you add the output of
ps -eo uid,state,comm? The line with your process (capture) would be enough.– John WH Smith
Dec 16 '14 at 23:33
Of course, Now I have not OpenCV on my System. I'll put it when I install if I remember. Thank you.
– Mohammad Etemaddar
Oct 10 '16 at 11:44
Of course, Now I have not OpenCV on my System. I'll put it when I install if I remember. Thank you.
– Mohammad Etemaddar
Oct 10 '16 at 11:44
add a comment |
1 Answer
1
active
oldest
votes
When you use Ctrl+z, the process is sending to background, so never was stopped.
You can see your processes in background with jobs command. And restore the process with fg command.
Try to stop the process with Ctrl+c.
edited Oct 10 '16 at 4:21
HalosGhost
3,76392236
answered Oct 10 '16 at 3:25
mvilchismvilchis
1
Then the issue is that, I can not stop the process using Ctrl + C. Because the camera reader, is in infinite loop. and won't stop using this signal. Maybe it's better to create a function to listen to Ctrl + Z or maybe Ctrl + C signal and then close the camera using it.
– Mohammad Etemaddar
Oct 10 '16 at 11:41
add a comment |
Your Answer
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "106"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f174543%2frelease-close-capture-of-camera%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
When you use Ctrl+z, the process is sending to background, so never was stopped.
You can see your processes in background with jobs command. And restore the process with fg command.
Try to stop the process with Ctrl+c.
edited Oct 10 '16 at 4:21
HalosGhost
3,76392236
answered Oct 10 '16 at 3:25
mvilchismvilchis
1
Then the issue is that, I can not stop the process using Ctrl + C. Because the camera reader, is in infinite loop. and won't stop using this signal. Maybe it's better to create a function to listen to Ctrl + Z or maybe Ctrl + C signal and then close the camera using it.
– Mohammad Etemaddar
Oct 10 '16 at 11:41
add a comment |
When you use Ctrl+z, the process is sending to background, so never was stopped.
You can see your processes in background with jobs command. And restore the process with fg command.
Try to stop the process with Ctrl+c.
edited Oct 10 '16 at 4:21
HalosGhost
3,76392236
answered Oct 10 '16 at 3:25
mvilchismvilchis
1
Then the issue is that, I can not stop the process using Ctrl + C. Because the camera reader, is in infinite loop. and won't stop using this signal. Maybe it's better to create a function to listen to Ctrl + Z or maybe Ctrl + C signal and then close the camera using it.
– Mohammad Etemaddar
Oct 10 '16 at 11:41
add a comment |
When you use Ctrl+z, the process is sending to background, so never was stopped.
You can see your processes in background with jobs command. And restore the process with fg command.
Try to stop the process with Ctrl+c.
edited Oct 10 '16 at 4:21
HalosGhost
3,76392236
answered Oct 10 '16 at 3:25
mvilchismvilchis
1
When you use Ctrl+z, the process is sending to background, so never was stopped.
You can see your processes in background with jobs command. And restore the process with fg command.
Try to stop the process with Ctrl+c.
edited Oct 10 '16 at 4:21
HalosGhost
3,76392236
answered Oct 10 '16 at 3:25
mvilchismvilchis
1
edited Oct 10 '16 at 4:21
HalosGhost
3,76392236
edited Oct 10 '16 at 4:21
HalosGhost
3,76392236
edited Oct 10 '16 at 4:21
HalosGhost
3,76392236
3,76392236
answered Oct 10 '16 at 3:25
mvilchismvilchis
1
answered Oct 10 '16 at 3:25
mvilchismvilchis
1
answered Oct 10 '16 at 3:25
mvilchismvilchis
1
1
Then the issue is that, I can not stop the process using Ctrl + C. Because the camera reader, is in infinite loop. and won't stop using this signal. Maybe it's better to create a function to listen to Ctrl + Z or maybe Ctrl + C signal and then close the camera using it.
– Mohammad Etemaddar
Oct 10 '16 at 11:41
add a comment |
Then the issue is that, I can not stop the process using Ctrl + C. Because the camera reader, is in infinite loop. and won't stop using this signal. Maybe it's better to create a function to listen to Ctrl + Z or maybe Ctrl + C signal and then close the camera using it.
– Mohammad Etemaddar
Oct 10 '16 at 11:41
Then the issue is that, I can not stop the process using Ctrl + C. Because the camera reader, is in infinite loop. and won't stop using this signal. Maybe it's better to create a function to listen to Ctrl + Z or maybe Ctrl + C signal and then close the camera using it.
– Mohammad Etemaddar
Oct 10 '16 at 11:41
Then the issue is that, I can not stop the process using Ctrl + C. Because the camera reader, is in infinite loop. and won't stop using this signal. Maybe it's better to create a function to listen to Ctrl + Z or maybe Ctrl + C signal and then close the camera using it.
– Mohammad Etemaddar
Oct 10 '16 at 11:41
add a comment |
Thanks for contributing an answer to Unix & Linux Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f174543%2frelease-close-capture-of-camera%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Could you add the output of
ps -eo uid,state,comm? The line with your process (capture) would be enough.– John WH Smith
Dec 16 '14 at 23:33
Of course, Now I have not OpenCV on my System. I'll put it when I install if I remember. Thank you.
– Mohammad Etemaddar
Oct 10 '16 at 11:44