Appsrc internal dataflow error.

[Justin J. Kim]

Your caps might have different format so it cannot negotiate properly.

According to source codes of openh264, it accepts only I420 format as an
input, but you used RGB here.


On Sun, Aug 30, 2015 at 6:01 AM, dtmoodie <dtmoodie at gmail.com> wrote:

> I'm trying to stream images from opencv to a gstreamer pipeline.
>
> My caps are as follows:
> GstCaps* caps = gst_caps_new_simple("video/x-raw",
>         "format", G_TYPE_STRING, "RGB24",
>         "width", G_TYPE_INT, imgSize.width,
>         "height", G_TYPE_INT, imgSize.height,
>         "framerate", GST_TYPE_FRACTION, 15, 1,
>         "pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1,
>         NULL);
>
> I've also tried with format = RGB.
> red_mask     = 0x00ff0000
> blue_mask   = 0x000000ff
> green_mask = 0x0000ff00
> endianness
>
> Some examples I'm going off of:
>
> http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/section-caps-api.html
> http://www.imgportal.net/home/wp-content/uploads/maris-script1.cpp
>
> My desired pipeline:
> appsrc name=mysource ! openh264enc ! rtph264pay config-interval=1 pt=96 !
> udpsink host=127.0.0.1 port=8004
>
> Pushing data onto the appsrc:
>
> cv::Mat frameimage(user_data->imgSize, CV_8UC3);
> static GstClockTime timestamp = 0;
> GstBuffer *buffer;
> guint buffersize;
> GstFlowReturn ret;
> GstMapInfo info;
> buffersize = frameimage.cols * frameimage.rows * frameimage.channels();
> buffer = gst_buffer_new_and_alloc(buffersize);
> if (gst_buffer_map(buffer, &info, (GstMapFlags)GST_MAP_WRITE)) {
>         memcpy(info.data, frameimage.data, buffersize);
>         gst_buffer_unmap(buffer, &info);
> }
> else
> {
>         BOOST_LOG_TRIVIAL(error) << "Unable to map image data to buffer";
> }
> ret = gst_app_src_push_buffer((GstAppSrc*)user_data->source_OpenCV,
> buffer);
> if (ret != GST_FLOW_OK) {
>         BOOST_LOG_TRIVIAL(error) << "something wrong in cb_need_data";
>         g_main_loop_quit(user_data->glib_MainLoop);
> }
>
> Full source can be found here:
>
> https://github.com/dtmoodie/EagleEye/blob/Dev/Plugins/GStreamer/src/gstreamer.cpp
>
>
>
>
> --
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