[bug PyQt 5.15.2] segmentation fault using QVideoFilterRunnable

[Phil Thompson]

On 11/02/2021 09:19, Adrian Fiergolski wrote:
> On 10.02.2021 at 23:09, Phil Thompson wrote:
>> On 10/02/2021 17:53, Adrian Fiergolski wrote:
>>> On 10.02.2021 18:35, Phil Thompson wrote:
>>>> On 10/02/2021 16:30, Adrian Fiergolski wrote:
>>>>> Hi,
>>>>> 
>>>>> I am getting segmentation fault using QVideoFilterRunnable. I try 
>>>>> to
>>>>> follow the example from the documentation.
>>>>> 
>>>>> I am enclosing the testcase and the log from the debugger (gdb).
>>>>> 
>>>>> My setup: yocto (with meta-qt5 gatesgarth, PyQt 5.15.2) running on
>>>>> Cortex A-53, kernel 5.4).
>>>>> 
>>>>> I got the same issue with PyQt 5.13.2 on my embedded platform. The
>>>>> problem is reproducible on a PC (running Ubuntu 20.04 with 
>>>>> installed
>>>>> qt5-default and pyqt5-dev).
>>>>> 
>>>>> Once the filter is commented out (case.qml:17), everything runs
>>>>> smoothly.
>>>>> 
>>>>> Do you know any workaround for that? I need to process data from a
>>>>> camera in OpenCV (I wanted to do it the QVideoFilterRunnable:run) 
>>>>> and
>>>>> paint the resulting processed frame.
>>>> 
>>>> I suspect that this needs hard-coded support for 
>>>> QVideoFilterRunnable
>>>> in the same way that PyQt supports QValidator in QML.
>>>> 
>>>> There is no workaround that I'm aware of.
>>> 
>>> Hi Phil,
>>> 
>>> Thank you for your reply. I am new to Qt. Could you elaborate on your
>>> answer?
>> 
>> I'm not sure what you mean - PyQt would need to be enhanced to support
>> this particular use case.
>> 
>> Phil
> 
> So which use case of QVideoFilterRunnable and QAbstractVideoFilter is
> currently supported in PyQt?

Using them from QML.

Phil