[bug PyQt 5.15.2] segmentation fault using QVideoFilterRunnable

Adrian Fiergolski adrian.fiergolski at fastree3d.com
Thu Feb 11 09:19:00 GMT 2021

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?


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