I think you forgot the last part:

(gdb) bt
[...paste the following outputet]
(gdb) quit

IOhannes wants to see a full backtrace. it should look like this: https://ftp.gnu.org/old-gnu/Manuals/gdb/html_node/gdb_42.html
 
Christof

Gesendet: Donnerstag, 30. August 2018 um 15:36 Uhr
Von: "Csaba Láng" <langcsaba@gmail.com>
An: Pd-List <pd-list@lists.iem.at>
Betreff: Re: [PD] videoPYLON C++ update needed

Iohannes,
 
managed to make a crash, check the gdb log in the attachment.
Basically there is a Segmentation Fault.
What does it mean and how can I fix it? 

On Thu, Aug 30, 2018 at 12:52 AM Csaba Láng <langcsaba@gmail.com[mailto:langcsaba@gmail.com]> wrote:

could not manage to make it crash :) jumps between devices smoothly.
Will test it the next days, but anyway
I big thanks to you! It looks amazing.
Now I test with 227fps. 

On Thu, Aug 30, 2018 at 12:28 AM IOhannes m zmölnig <zmoelnig@iem.at[mailto:zmoelnig@iem.at]> wrote:On 8/29/18 11:35 PM, Csaba Láng wrote:
>
> The other problem is that can not identify within pd the cameras.
> Anything I send to pix_video, fails.
> I called the cams test1 and test2, however [device test1( does not work,
> therefor enumerate as well or enumProp.

???

> It says that a valid device is
> needed, but f I have an image from the camera at startup the patch, why I
> cannot enumerate it.

you need a valid device for [enumProps(, but not for [enumerate(.
you need to hook something like a [print] to the 2nd outlet of
[pix_video] in order to get anything meaningful from these messages.

>
> unfortunately did not understand your gdb or microsleep select advices.
> please specify

Pd prints an error like "microsleep select: Interrupted system call" on
the console before it hangs here. does something similar happen?

about gdb, something like this should do the trick (i'm sure i've posted
this before):

~~~
$ gdb --args pd -nrt -stderr -lib /path/to/Gen /path/to/pix_video-help.pd
[...]
(gdb) thread apply all bt
(gdb) run
[...make it crash...]
(gdb) bt
[...paste the following outputet]
(gdb) quit
~~~

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