how remove alpha channel

[Dušan Poizl]

Dňa 27.10.2014 o 10:36 Potoman napísal(a):
> Up !
>
>
> First, I don't launch my pipeline by command line.
>
> I launch my cpp program by jni/java and this part work perfectly.
>
> So I can't show you the line command of gst-launch.
>
> I don't display for information about verbose by this way. Maybe you can
> help me for that :)
>
>
> In second part, I really want an answer about my three question. it's
> probably help me usefull.
> And this question are not very link to my problem so I think everyone can
> tell me the answer if they know it without understand my problem very well
> :)
>
>
> In thirt part, I can tell you more about my problem :)
>
>
> I know that there are a comma in the caps definition, but as I say, I don't
> launch my pipeline by command line.
>
> The problem is that the flux of the pipeline, after videoconvert, still ARGB
> format.
>
> So I think I don't parameter correctly videoconvert. Is it that way :
>
> /gstElementN = gst_element_factory_make ("videoconvert", "video_convert_0");
> GstPad * source_1 = gst_element_get_static_pad (gstElementN, "src");
> std::cout << "source_1 : " << source_1 << " for videoconvert." << std::endl;
> GstCaps * caps = gst_caps_new_simple ("video/x-raw",
>                                         "format", G_TYPE_STRING, "RGB",
>                                         NULL);
> gboolean ret= gst_pad_set_caps(source_1, caps);/
You don't set caps to videoconvert pad. IMHO this is why you get false.
Instead you create new element "capsfilter" which have caps property. So
your pipeline should be videoconvert ! capsfilter ! sink
>
>
>
> In my case, return value "ret" is alway false.
>
> With Microsoft Visual, the debugger tell by that de gst_pad_push_event in
> the gst_pad_set_caps function return always 0.
>
> cf :
>
>
> /static inline gst_pad_set_caps (GstPad * pad, GstCaps * caps)
> {
>   GstEvent *event;
>   gboolean res = TRUE;
>
>   g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
>   g_return_val_if_fail (caps != NULL && gst_caps_is_fixed (caps), FALSE);
>
>   event = gst_event_new_caps (caps);
>
>   if (GST_PAD_IS_SRC (pad))
>     res = gst_pad_push_event (pad, event);
>   else
>     res = gst_pad_send_event (pad, event);
>
>   return res;
> }/
>
> Shouldn't be return 1 if the event is correctly handled ?
>
>
>
>
>
>
>
>
> --
> View this message in context: http://gstreamer-devel.966125.n4.nabble.com/How-remove-the-alpha-channel-tp4669152p4669200.html
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