Segmentation Fault

[Ian Davidson]

Thanks Tim and Kris,

I assumed that Tim meant "gst_caps_from_string" rather than 
"gst_caps_new_from_string".  Now to see if the rest of my application 
links together OK.

Ian

On 05/01/2013 13:55, Tim-Philipp Müller wrote:
> On Sat, 2013-01-05 at 09:12 +0000, Ian Davidson wrote:
>
> Hi Ian,
>
>> I am trying to write a GStreamer app where I  use a caps filter.  I have
>>
>>     vcapsfilter  = gst_element_factory_make ("capsfilter", "vid-caps");
>>
>> which appears to have been successful.
>>
>> Then I tried
>>
>>     g_object_set (G_OBJECT (vcapsfilter), "caps",
>> "video/x-raw,format=(string)I420,width=320,height=240,framerate=(fraction)25/1",
>> NULL);
>>
>> When my program comes to execute that line I get a "Segmentation fault
>> (core dumped)" message.  I suspect that I must be doing something wrong
>> <grin>, but I don't know what I should be doing.  I have tried to wind
>> up the debug level to 9 but absolutely nothing gets logged.
> The reason is that the "caps" property takes a GstCaps object/structure,
> not a string. g_object_set() is a vararg function, so this kind of
> mistake can not always be detected before crashing.
>
> gst-launch-1.0/gst_parse_launch() converts things automagically from
> string into the right type.
>
> You have two options:
>
> a)
>
>    GstCaps *caps;
>
>    caps = gst_caps_new_from_string ("video/x-raw,....");
>    g_object_set (foo, "caps", caps, NULL);
>    gst_caps_unref (caps);
>
> b)
>
>    gst_util_set_object_arg (foo, "caps", "video/x-raw,...");
>
> Cheers
>   -Tim
>
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