How to debug Gstreamer on Windows

[Daniel Sperka]

Could it be that you are using elements that do not work on windows?

A desktop app, for example, will have to create different audio sink
elements for mac/linux/windows/. When I had this bug, the windows version
failed when creating "osxaudiosink", as it should. I was sloppy in checking
for NULL or return values when adding,linking in pipeline. When I try to
run application, it fails when I try to preroll (change of state to PAUSE)
because the pipeline is incomplete (no sink).

My fix was to use the correct elements for different platforms - the
project (Qt) that has code something like this:

audioSink = NULL;

*#if* defined(Q_OS_MAC)

qDebug() << "make osxaudiosink for mac";

audioSink = gst_element_factory_make("osxaudiosink");

*#elif* defined(Q_OS_LINUX)

qDebug() << "make alsasink for linux";

audioSink = gst_element_factory_make("alsaudiosink");

*#elif* defined(Q_OS_WIN)

qDebug() << "make directsoundsink for win";

audioSink = gst_element_factory_make("directsoundsink");

*#else*

qDebug() << "Unsupported OS.";

*#endif*


Q_ASSERT(audioSink);



Dan

On Thu, Mar 26, 2020 at 4:34 PM Yair Reshef <yair99 at gmail.com> wrote:

> dependency walker sometime finds missing stuff.
> try to prepend it with GST_DEBUG:7
>
> more here
>
> https://gstreamer.freedesktop.org/documentation/tutorials/basic/debugging-tools.html?gi-language=c
>
> On Fri, Mar 27, 2020 at 1:19 AM Erik Herz <erik at vivoh.com> wrote:
>
>> I have an app that runs on my Windows build machine but not on another
>> windows machine.
>>
>> I get this error:
>> gst_element_set_state() returns GST_STATE_CHANGE_FAILURE
>>
>> I suspect that I am missing a library.
>>
>> How can I debug what is happening?
>>
>> My App is QT-based.
>> _______________________________________________
>> gstreamer-devel mailing list
>> gstreamer-devel at lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
> _______________________________________________
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> gstreamer-devel at lists.freedesktop.org
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>


-- 
Daniel J. Sperka, Ph. D.
UC Davis Center for Neuroscience
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