appsink and vaapi

[Bobry Chaosu]

Hi,
I'm new to gstreamer.
I'm trying to make a pipe "filesrc ! ffdemux... ! vaapidecode ! appsink" to
obtain frame or texture id of accelerated video.
I have alredy made working code with vaapisink, but i have to somehow get
frame or texture id, and not show the video (this woud be done in another
part of application, using opengl, and showing with other media). I'm not
even sure, that appsink is way to go, but this is the best I have found.
To use appsink, I have set cap "video/x-vaapi-surface" and turned on
"emit-signals". Flesrc have proper file location.
Elements links ok, but I get "Internal data stream error". Any help?

code fragment:

GstElement *source=gst_element_factory_make("filesrc","source";
GstElement
*demuxer=gst_element_factory_make("ffdemux_mov_mp4_m4a_3gp_3g2_mj2","demuxer");
GstElement *decoder=gst_element_factory_make("vaapidecode","decoder");
GstElement *sink=gst_element_factory_make("appsink","sink");
GstElement *pipeline;
pipeline = gst_pipeline_new ("mypipeline");

//setting values for appsink
GstCaps *cap = gst_caps_from_string("video/x-vaapi-surface");
gst_app_sink_set_caps((GstAppSink*) sink, cap);
g_object_set (G_OBJECT (sink, "emit-signals", true, NULL);

//file location for filesrc
g_object_set (G_OBJECT (filesrc, "location", filePath.toAscii().data(),
NULL);

//adding to bin
gst_bin_add (GST_BIN (pipeline), source);
gst_bin_add (GST_BIN (pipeline), demuxer);
gst_bin_add (GST_BIN (pipeline), decoder);
gst_bin_add (GST_BIN (pipeline), sink);

//linking
qDebug() << gst_element_link(source,demuxer);
qDebug() << gst_element_link(decoder,sink);
g_signal_connect (demuxer, "pad-added", G_CALLBACK (cb_new_pad), decoder);
//linking demuxer with decoder



best regards,
Bober
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