<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#ffffff" text="#000000"> On 10/26/2011 03:12 AM, Rossana Guerra wrote: <blockquote cite="mid:CAAMjx-fc2SXEvMRM0UhtwPx455A6bwK+=iv718+YU8m01p50JA@mail.gmail.com" type="cite"> <pre wrap="">Hi I trying to control the position property of a smptealpha element. It controls the opacity of the alpha channel,</pre> </blockquote> no, position controls the transition of the fade. 0.0:input1, 1.0:input2. <blockquote cite="mid:CAAMjx-fc2SXEvMRM0UhtwPx455A6bwK+=iv718+YU8m01p50JA@mail.gmail.com" type="cite"> <pre wrap=""> it varies from 0.0 to 1.0. The duration of this setting is 500ms. I am working around this problem, it happens at runtime, I can't figure out what it's wrong. </pre> </blockquote> What is not working? The code snippet looks more of less okay. Maybe you can post a full standalone example. Stefan <blockquote cite="mid:CAAMjx-fc2SXEvMRM0UhtwPx455A6bwK+=iv718+YU8m01p50JA@mail.gmail.com" type="cite"> <pre wrap=""> Thanks and regards, Rossana Here's the code; _____________ gst_interpolation_control_source_set: assertion `G_VALUE_TYPE (value) == self->priv->type' failed // Agrego Controlador gdouble duracion = 500; </pre> </blockquote> guint64 duracion = 500; <blockquote cite="mid:CAAMjx-fc2SXEvMRM0UhtwPx455A6bwK+=iv718+YU8m01p50JA@mail.gmail.com" type="cite"> <pre wrap=""> GstController * ctrl = gst_object_control_properties(G_OBJECT(smpte), "position",NULL); if (ctrl == NULL) { GST_WARNING ("No puede controlar el elemento fuente\n"); return 0; } // Todo valor GValue debe inicializarse en 0 GValue val_double = { 0, }; g_value_init (&val_double, G_TYPE_DOUBLE); // Seteo modo de interpolacion GstInterpolationControlSource * csource = gst_interpolation_control_source_new(); gst_interpolation_control_source_set_interpolation_mode(csource,GST_INTERPOLATE_LINEAR); // Seteo primer valor g_value_set_double(&val_double, 0.0); gst_interpolation_control_source_set(csource,(0 * GST_MSECOND),&val_double); // Seteo segundo valor g_value_set_double (&val_double, 1.0); gst_interpolation_control_source_set(csource,(duracion*GST_MSECOND),&val_double); gst_controller_set_control_source (ctrl, "position", GST_CONTROL_SOURCE (csource)); g_object_unref (csource); g_value_unset (&val_double); </pre> <pre wrap=""> <fieldset class="mimeAttachmentHeader"></fieldset> _______________________________________________ gstreamer-devel mailing list <a class="moz-txt-link-abbreviated" href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> <a class="moz-txt-link-freetext" href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </pre> </blockquote> </body> </html>