Writing raw frames to mpegts [SEC=UNCLASSIFIED]
Durrand, Paul (Contractor)
Paul.Durrand at dsto.defence.gov.au
Mon Aug 1 22:12:41 PDT 2011
UNCLASSIFIED
I am making slight progress with this problem. I have fully defined the
caps for APPSRC to match those specified as a SINK in ffmpegcolorspace.
My new pipeline is (the rest of the source is below in the original
email):
char *fullPipelineDesc = "appsrc is-live=true name=\"adsssrc\"
caps=\"video/x-raw-rgb,width=704,height=480,framerate=(fraction)25/1,bpp
=24,depth=24,red_mask=255,green_mask=65280,blue_mask=16711680,endianness
=4321\" ! ffmpegcolorspace !
video/x-raw-yuv,width=704,height=480,framerate=(fraction)25/1,format=(fo
urcc)I420 ! ffenc_mpeg2video ! mpegtsmux ! filesink
location=processed.mpg ";
With this I see the following error:
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, bpp=(int)24, depth=(int)24,
red_mask=(int)255, green_mask=(int)65280, blue_mask=(int)16711680,
endianness=(int)4321 in anything we support
This puzzles me as the both the sink and src capabilities match the
output I see from "gst-inspect-0.10 ffmpegcolorspace". Am I missing
something?
Thanks,
Paul
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________________________________
From: Durrand, Paul (Contractor)
Sent: Monday, 1 August 2011 3:49 PM
To: 'Discussion of the development of and with GStreamer'
Subject: Writing raw frames to mpegts [SEC=UNCLASSIFIED]
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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the sender and delete the email.
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