Writing raw frames to mpegts [SEC=UNCLASSIFIED]

[Durrand, Paul (Contractor)]

UNCLASSIFIED

Hi,
 
I am currently trying to develop an application which utilises GStreamer
to write and YUV format mpegts file. The driver uses appsrc to write raw
RGB frames to a YUV mpegts file.
 
I am trying to get a pipeline together and as I'm new to GStreamer I am
not quite sure which plugins and caps to set.I was hoping someone can
point me in the right direction.
 
With the pipeline: "appsrc name=\"adsssrc\"
caps=\"video/x-raw-rgb,width=704,height=480,framerate=(fraction)25/1\" !
ffmpegcolorspace ! video/x-raw-yuv ! ffenc_mpeg2video ! mpegtsmux !
filesink location=processed.mpg " I get the following errors:

	 0:00:00.107419734 ESC[332m28183ESC[00m      0x2556010
ESC[32;01mINFO   ESC[00m ESC[00;01;31m          GST_STATES
gstbin.c:2425:gst_bin_change_state_func:<bin0>ESC[00m child 'adsssrc'
changed state to 3(PAUSED) successfully
	0:00:00.140944498 ESC[332m28183ESC[00m      0x2758f90
ESC[33;01mWARN   ESC[00m ESC[00m       basetransform
gstbasetransform.c:1047:gst_base_transform_acceptcaps:<capsfilter0>ESC[0
0m transform could not transform video/x-raw-rgb, width=(int)704,
height=(int)480, framerate=(fraction)25/1 in anything we support
	0:00:00.141210658 ESC[332m28183ESC[00m      0x2758f90
ESC[33;01mWARN   ESC[00m ESC[00m       basetransform
gstbasetransform.c:1144:gst_base_transform_setcaps:<ffmpegcsp0>ESC[00m
FAILED to configure caps <ffmpegcsp0:src> to accept video/x-raw-yuv,
width=(int)704, height=(int)480, framerate=(fraction)25/1,
format=(fourcc)I420
	0:00:00.141441378 ESC[332m28183ESC[00m      0x2758f90
ESC[32;01mINFO   ESC[00m ESC[00m             basesrc
gstbasesrc.c:2447:gst_base_src_loop:<adsssrc>ESC[00m pausing after
gst_pad_push() = not-negotiated

My test source is below:
 

	#include <stdlib.h>
	#include <glib.h>
	#include <gst/gst.h>
	#include <gst/app/gstappsink.h>
	#include <gst/app/gstappsrc.h>
	#include <gst/app/gstappbuffer.h>
	 
	

	int main(void)
	{ 
	 
	  const int width=704;
	  const int height=480;
	  const int numFrames=50;
	  const int layers=3;
	 
	  char *fullPipelineDesc = "appsrc name=\"adsssrc\"
caps=\"video/x-raw-rgb,width=704,height=480,framerate=(fraction)25/1\" !
ffmpegcolorspace ! video/x-raw-yuv ! ffenc_mpeg2video ! mpegtsmux !
filesink location=processed.mpg ";
	  GstElement *writePipeline;
	  GError     *error     = NULL;
	  GstAppSrc *appsrc    = NULL;
	  GstBuffer *app_buffer;
	  unsigned char *outByte;
	  unsigned char *outBuff;
	  int outBuffSize = width * height * layers;
	  int count=0;
	 
	  outBuff = calloc(outBuffSize, sizeof(unsigned char));
	 

	  gst_init(NULL, NULL);
	  gst_debug_set_default_threshold(GST_LEVEL_INFO);
	 
	  writePipeline =
gst_parse_bin_from_description(fullPipelineDesc, FALSE, &error);
	  appsrc = (GstAppSrc *)
gst_bin_get_by_name(GST_BIN(writePipeline), "adsssrc");
	  gst_element_set_state(writePipeline, GST_STATE_PLAYING);
	 
	  /******** WRITE SOME RGB DATA INTO A BUFFER *******/
	  for (int frame=0; frame<numFrames; frame++)
	  {
	     count = 0;
	     for (int row=0; row<height; row++)
	     {
	        for (int plane=0; plane<layers; plane++)
	 {
	 
	   for (int pixel=0; pixel<width; pixel++)
	   {
	 fflush(stdout);
	      outByte  = outBuff;
	      outByte += (row*width*layers) + (pixel*layers) + plane;
	 
	      if (row%2)
	        *outByte = 255;
	      else
	        *outByte = 0;
	 
	          }
	        }
	      }
	      app_buffer = gst_app_buffer_new(outBuff, outBuffSize, 
	                                  g_free, outBuff);
	 
	      /* Write the buffer to the source pad */
	      gst_app_src_push_buffer(GST_APP_SRC(appsrc), app_buffer);
	  }
	 
	  gst_app_src_end_of_stream(appsrc);
	 
	  free(outBuff);
	 
	  return 0;
	}

 
 
 
 

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