Bristol Digest, Vol 583, Issue 3

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Today's Topics:

1. Streaming webcam (jpff)
2. Re: Streaming webcam (Alex Butcher (LUG))
3. Re: Streaming webcam (Chris)


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Message: 1
Date: Wed, 31 Dec 2014 19:16:18 +0000
From: jpff <jpff@codemist.co.uk>
To: bristol@mailman.lug.org.uk
Subject: [bristol] Streaming webcam
Message-ID: <6079-Wed31Dec2014191618+0000-jpff@codemist.co.uk>

For a number of years I have used mjpg-streamer to put webcam data on
the net, using an external USB webcam. I now have a new laptop with
internal webcam. But whenever I attempt to stream all is OK until I
look at the local webpage (http://127.0.0.1/?action=stream)
mjpg-streamer segfaults

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff5d4e700 (LWP 541)]
0x00007ffff7bd01b8 in __lll_unlock_elision () from /lib64/libpthread.so.0
Missing separate debuginfos, use: zypper install libjpeg8-debuginfo-8.0.2-30.5.1.x86_64
(gdb) where
#0 0x00007ffff7bd01b8 in __lll_unlock_elision () from /lib64/libpthread.so.0
#1 0x00007ffff7bcafd7 in pthread_cond_wait@@GLIBC_2.3.2 ()
from /lib64/libpthread.so.0
#2 0x00007ffff6deb4bd in send_stream () from ./output_http.so
#3 0x00007ffff6dec074 in client_thread () from ./output_http.so
#4 0x00007ffff7bc70a4 in start_thread () from /lib64/libpthread.so.0
#5 0x00007ffff76f87fd in clone () from /lib64/libc.so.6

Does anyone have any ideas how to fix, or an alternative streaming
program.

==John ffitch



------------------------------

Message: 2
Date: Wed, 31 Dec 2014 19:49:33 +0000
From: "Alex Butcher (LUG)" <lug@assursys.co.uk>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>,
jpff <jpff@codemist.co.uk>
Subject: Re: [bristol] Streaming webcam
Message-ID: <7B6AC098-E40F-4273-A899-FA08F1DEC5CC@assursys.co.uk>
Content-Type: text/plain; charset="utf-8"

That stack trace is pretty useless. Follow the advice it gives ("Missing separate debuginfos, use: zypper install libjpeg8-debuginfo-8.0.2-30.5.1.x86_64") and try again.

On 31 December 2014 19:16:18 GMT+00:00, jpff <jpff@codemist.co.uk> wrote:
>For a number of years I have used mjpg-streamer to put webcam data on
>the net, using an external USB webcam. I now have a new laptop with
>internal webcam. But whenever I attempt to stream all is OK until I
>look at the local webpage (http://127.0.0.1/?action=stream)
>mjpg-streamer segfaults
>
>Program received signal SIGSEGV, Segmentation fault.
>[Switching to Thread 0x7ffff5d4e700 (LWP 541)]
>0x00007ffff7bd01b8 in __lll_unlock_elision () from
>/lib64/libpthread.so.0
>Missing separate debuginfos, use: zypper install
>libjpeg8-debuginfo-8.0.2-30.5.1.x86_64
>(gdb) where
>#0 0x00007ffff7bd01b8 in __lll_unlock_elision () from
>/lib64/libpthread.so.0
>#1 0x00007ffff7bcafd7 in pthread_cond_wait@@GLIBC_2.3.2 ()
> from /lib64/libpthread.so.0
>#2 0x00007ffff6deb4bd in send_stream () from ./output_http.so
>#3 0x00007ffff6dec074 in client_thread () from ./output_http.so
>#4 0x00007ffff7bc70a4 in start_thread () from /lib64/libpthread.so.0
>#5 0x00007ffff76f87fd in clone () from /lib64/libc.so.6
>
>Does anyone have any ideas how to fix, or an alternative streaming
>program.
>
>==John ffitch
>
>_______________________________________________
>Bristol mailing list
>Bristol@mailman.lug.org.uk
>https://mailman.lug.org.uk/mailman/listinfo/bristol

--
Sent from my Android phone with K-9 Mail. Please excuse my brevity.
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Message: 3
Date: Thu, 01 Jan 2015 09:39:02 +0000
From: Chris <cshorler@googlemail.com>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: Re: [bristol] Streaming webcam
Message-ID: <BBE5FC41-21EF-43AC-809A-77C98B582DE3@googlemail.com>
Content-Type: text/plain; charset="utf-8"

On 31 December 2014 19:49:33 GMT+00:00, "Alex Butcher (LUG)" <lug@assursys.co.uk> wrote:
>That stack trace is pretty useless. Follow the advice it gives
>("Missing separate debuginfos, use: zypper install
>libjpeg8-debuginfo-8.0.2-30.5.1.x86_64") and try again.
>
>On 31 December 2014 19:16:18 GMT+00:00, jpff <jpff@codemist.co.uk>
>wrote:
>>For a number of years I have used mjpg-streamer to put webcam data on
>>the net, using an external USB webcam. I now have a new laptop with
>>internal webcam. But whenever I attempt to stream all is OK until I
>>look at the local webpage (http://127.0.0.1/?action=stream)
>>mjpg-streamer segfaults
>>
>>Program received signal SIGSEGV, Segmentation fault.
>>[Switching to Thread 0x7ffff5d4e700 (LWP 541)]
>>0x00007ffff7bd01b8 in __lll_unlock_elision () from
>>/lib64/libpthread.so.0
>>Missing separate debuginfos, use: zypper install
>>libjpeg8-debuginfo-8.0.2-30.5.1.x86_64
>>(gdb) where
>>#0 0x00007ffff7bd01b8 in __lll_unlock_elision () from
>>/lib64/libpthread.so.0
>>#1 0x00007ffff7bcafd7 in pthread_cond_wait@@GLIBC_2.3.2 ()
>> from /lib64/libpthread.so.0
>>#2 0x00007ffff6deb4bd in send_stream () from ./output_http.so
>>#3 0x00007ffff6dec074 in client_thread () from ./output_http.so
>>#4 0x00007ffff7bc70a4 in start_thread () from /lib64/libpthread.so.0
>>#5 0x00007ffff76f87fd in clone () from /lib64/libc.so.6
>>
>>Does anyone have any ideas how to fix, or an alternative streaming
>>program.
>>
>>==John ffitch
>>
>>_______________________________________________
>>Bristol mailing list
>>Bristol@mailman.lug.org.uk
>>https://mailman.lug.org.uk/mailman/listinfo/bristol
>
>--
>Sent from my Android phone with K-9 Mail. Please excuse my brevity.
>
>------------------------------------------------------------------------
>
>_______________________________________________
>Bristol mailing list
>Bristol@mailman.lug.org.uk
>https://mailman.lug.org.uk/mailman/listinfo/bristol

The stack trace shows a threading issue.

Where did you get mjpg-streamer?

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End of Bristol Digest, Vol 583, Issue 3
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