GStreamer-devel

Problem feeding appsrc to H264

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Kaarjuus

Problem feeding appsrc to H264

I am new to Gstreamer and have trouble feeding a custom appsrc via H264 to RTP. My pipeline:

appsrc name=mysrc ! videorate ! ffmpegcolorspace ! videoscale method=1 
! video/x-raw-yuv,width=320,height=240,format=(fourcc)UYVY,framerate=\(fraction\)15/1 
! TIVidenc1 codecName=h264enc engineName=codecServer ! rtph264pay pt=96 
! udpsink host=192.168.1.112 port=5000

The appsrc read_data function contains this:

static gboolean white = FALSE;
gdouble ms = g_timer_elapsed(app->timer, NULL);
if (ms > 1.0/15.0) {
  GstBuffer* buffer = gst_buffer_new();
  GST_INFO("Pushing new data into pipe, elapsed seconds=%f.", ms);
  memset(GST_BUFFER_DATA(buffer), white ? 0xff : 0x0, GST_BUFFER_SIZE(buffer));
  GST_BUFFER_SIZE(buffer) = 320 * 240 * 3 * sizeof(guchar);
  white = !white;
  g_signal_emit_by_name(app->appsrc, "push-buffer", buffer, &ret);
  gst_buffer_unref(buffer);
}

The pipeline runs for a few frames and then stops with:

rtsptest: Framecopy.c:108: _execute: Assertion `Buffer_getUserPtr(hSrcBuf)' failed.

When increasing debuglevel, I can see the following relevant lines:

default main.c:38:read_data: Pushing new data into pipe, elapsed seconds=0.066681.           
 appsrc gstappsrc.c:1456:gst_app_src_push_buffer_full:<mysrc> queue filled (230400 >= 200000)
default main.c:71:stop_feed: Entering stop_feed(pipeline=0xec0c0, app=0x11f9c).

Seems the trouble is in the appsrc buffering configuration, I just don't know what to set and where. Same pipeline using videotestsrc instead of appsrc works, encodes and streams perfectly.

Full current code is available at pastebin.