I've solved the internal data flow error, it was a stupid mistake : simply miss an element into the "gst_element_link_many"; function.
But now I've a nother problem.
I'm writing a gst application in which I'm trying to decode mpeg4 packet received from a net source, I've already done the methods to connect to the mpe4 source and get the
compressed data, now I'm only find a way to decode this stream with
gst.
I9;ve the function to obtain a mpeg4 packet and I would use it into
the fakesrc callback.
Here some snippet of code, note that the callback actually do nothing;
............................
pipeline = gst_pipeline_new ("pipeline");
fakesrc = gst_element_factory_make ("fakesrc", "source");
decoder = gst_element_factory_make ("ffdec_mpeg4","mpeg4-decoder");/*(";theoradec", "theora-decoder");*/
videoscale = gst_element_factory_make ("videoscale", "scaling-video");
par = gst_element_factory_make ("capsfilter", "dimens");
g_object_set (G_OBJECT(par), "caps",
gst_caps_new_simple( "video/x-raw-yuv",
"width", G_TYPE_INT, 720,
"height", G_TYPE_INT, 576,NULL),
NULL );
; conv = gst_element_factory_make ("ffmpegcolorspace", "converter");
videosink = gst_element_factory_make ("directdrawsink", "directdraw";);
; if (!pipeline || !fakesrc || !decoder || !videoscale || !par || !conv || !videosink) {
g_print ("One element could not be createdn");
return -1;
; }
/* put all elements in a bin */
; gst_bin_add_many (GST_BIN (pipeline),
fakesrc, decoder,videoscale ,par, conv, videosink, NULL);
/* link together */
gst_element_link_many (fakesrc,decoder,videoscale, par, conv, videosink, NULL);
//this's for information message about errors
bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
gst_bus_add_watch (bus, bus_call, loop);
gst_object_unref (bus);
g_object_set (G_OBJECT (fakesrc),
"signal-handoffs", TRUE,
"sizemax", 720 * 288 * 2,
"sizetype", 2, NULL);
//cb_handoff is my callback
g_signal_connect (fakesrc, "handoff", G_CALLBACK (cb_handoff), pParam);
............................
When I execute this code gst return this message "Internal GStreamer Error: negotiation problem".
2007/3/19, Stefan Kost <
ensonic hora-obscura.de" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">ensonichora-obscura.de
>;:Hi Riccardo,
you need to start you app using
GST_DEBUG="*:3" ./app
then it look for lines with WARN. A bit above should be the cause. If it does
not show anything you can raise the log level ("*:4", it goes up to 5). The
reason can be anything from missing conversion elements, to real bugs. It would
help if you can tell what you are doing.
Stefan
Riccardo Corona wrote:
>; Hi,
> someone knows the most common sources for the error "Internal data flow
> error";?
>
>; --
> Riccardo Corona
>;
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--
Riccardo Corona
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