作者:lily0407520 | 来源:互联网 | 2023-08-07 18:00
IamhavingaproblemwithdecodingavideostreamfrommyraspberrypitoalaptopwithaQtGUI.我
I am having a problem with decoding a video stream from my raspberry pi to a laptop with a Qt GUI.
我有一个问题,从我的覆盆子pi解码视频流到具有Qt GUI的笔记本电脑。
My pipeline for the pi is (using the adafruit raspberry pi camera):
我的pi管道是(使用adafruit覆盆子pi相机):
raspivid -t 999999 -h 480 -w 640 -fps 25 -hf -b 2000000 -o - | gst-launch-1.0 -v fdsrc ! h264parse ! rtph264pay config-interval=1 pt=96 ! gdppay ! tcpserversink host=10.0.0.128 port=5000
Just using a viewer on the laptop with the pipeline:
只需在笔记本电脑上使用带有管道的查看器:
gst-launch-1.0 -v tcpclientsrc host=10.0.0.128 port=5000 ! gdpdepay ! rtph264depay ! avdec_h264 ! videoconvert ! autovideosink sync=false
Gives very nice color video at a pretty decent rate, although I didn't measure the frame rate.
虽然我没有测量帧速率,但是以相当不错的速度提供了非常漂亮的彩色视频。
When I use qtgstreamer in my GUI application (with a source width=640,height=480 and I assume an 8-bit RGB image) I am getting the buffer size in the below code of 460800, and I expect it to be 921600. If I use the QImage::Format_RGB888 the program will crash because the image buffer is too small. If I use QImage::Format_Index8 it will run fine, show video in my GUI and all but is Black and White. Anyone have any ideas? Here is my relevant code:
当我在我的GUI应用程序中使用qtgstreamer时(源宽度= 640,高度= 480,我假设一个8位RGB图像)我在下面的代码460800中得到缓冲区大小,我希望它是921600。如果我使用QImage :: Format_RGB888,程序将崩溃,因为图像缓冲区太小。如果我使用QImage :: Format_Index8它将运行正常,在我的GUI中显示视频,但除了黑白之外。有人有主意吗?这是我的相关代码:
bool CameraStreamer::initStreamer()
{
gst_init (NULL, NULL);
//gst-launch-1.0 -v tcpclientsrc host=10.0.0.128 port=5000 ! gdpdepay ! rtph264depay ! avdec_h264 ! videoconvert ! autovideosink sync=false
pipeline = gst_pipeline_new("Camera");
source = gst_element_factory_make ("tcpclientsrc", "cam-source");
depay = gst_element_factory_make("gdpdepay", "depay");
rtpdepay = gst_element_factory_make("rtph264depay","rtp-depay");
decoder = gst_element_factory_make ("avdec_h264", "videodecoder");
videocOnvert= gst_element_factory_make("videoconvert","video-convert");
sink = gst_element_factory_make ("appsink", "video-output");
if (!pipeline || !source || !depay || !rtpdepay || !decoder || !videoconvert || !sink ) {
qDebug() <<"One element could not be created. Exiting.\n";
return false;
}
callbacks.eos = NULL;
callbacks.new_sample = newBufferCallback;
callbacks.new_preroll = NULL;
gst_app_sink_set_callbacks((GstAppSink *) sink, &callbacks, this, NULL);
g_object_set (G_OBJECT(source), "port", 5001, NULL);
g_object_set (G_OBJECT(source),"host","10.0.0.128",NULL);
gst_bin_add_many (GST_BIN (pipeline),
source, depay,rtpdepay,decoder, videoconvert,sink, NULL);
if (!gst_element_link_many (source, depay,rtpdepay,decoder, videoconvert,sink, NULL))
g_warning ("Main pipeline link Fail...");
ret = gst_element_set_state (pipeline, GST_STATE_PLAYING);
if (ret == GST_STATE_CHANGE_FAILURE)
{
g_printerr ("Unable to set the pipeline to the playing state.");
gst_object_unref (pipeline);
return false;
}
return true;
}
GstFlowReturn CameraStreamer::newBufferCallback(GstAppSink *app_sink, void *obj)
{
if(app_sink == NULL)
{
qDebug() <<"app_sink is NULL";
return GST_FLOW_ERROR;
}
GstSample* sample = gst_app_sink_pull_sample(app_sink);
if(!sample)
{
qDebug() <<"Error retreiving buffer...";
return GST_FLOW_ERROR;
}
GstCaps* caps = gst_sample_get_caps (sample);
if (!caps) {
qDebug() <<"could not get snapshot format\n";
exit (-1);
}
gint width, height;
GstStructure* s = gst_caps_get_structure (caps, 0);
int res = gst_structure_get_int (s, "width", &width)
| gst_structure_get_int (s, "height", &height);
if (!res) {
qDebug() <<"could not get snapshot dimension\n";
exit (-1);
}
GstMapInfo map;
GstBuffer *buffer = gst_sample_get_buffer (sample);
qDebug() <<"size: " <emitNewImage(img);
gst_buffer_unmap (buffer, &map);
gst_sample_unref (sample);
return GST_FLOW_OK;
}
2 个解决方案