• Hardware Platform (Jetson / GPU)
dGPU
• DeepStream Version
5.1
• NVIDIA GPU Driver Version (valid for GPU only)
465.19.01
Hello,
I am trying to use opencv to save/cache frames from a certain source and save them as a video if some condition occurs. I have followed this code snippet Deepstream sample code snippet - #3 by bcao. I have also followed the gst-dsexample plugin.
The issue is that the video I save is filled with frames from all the sources and not just the source I specified.
The following is the code I added to the bbox_generated_probe_after_analytics callback function in test5 app.
Note that I don’t want to transform the buffer surface (do not want to crop or filter the images) and that I am setting memory types as cuda unified memory.
GstMapInfo in_map_info;
NvBufSurface *surface;
NvDsFrameMetaList * l_frame;
NvDsFrameMeta *frame_meta;
memset(&in_map_info, 0, sizeof(in_map_info));
if (!gst_buffer_map (buf, &in_map_info, GST_MAP_READ)) {
g_print ("Error: Failed to map gst buffer\n");
goto error;
}
surface = (NvBufSurface *) in_map_info.data;
for (l_frame = batch_meta->frame_meta_list; l_frame != NULL;
l_frame = l_frame->next) {
frame_meta = (NvDsFrameMeta *) (l_frame->data);
NvBufSurfaceMap (surface, -1, -1, NVBUF_MAP_READ);
/* Cache the mapped data for CPU access */
NvBufSurfaceSyncForCpu (surface, 0, 0); // will do nothing for unified memory type on dGPU
guint height = surface->surfaceList[frame_meta->batch_id].height;
guint width = surface->surfaceList[frame_meta->batch_id].width;
cv::Mat nv12_mat = cv::Mat(height*3/2, width, CV_8UC1,
surface->surfaceList[frame_meta->batch_id].mappedAddr.addr[0],
surface->surfaceList[frame_meta->batch_id].pitch);
cv::Mat bgr_frame;
cv::cvtColor (nv12_mat, bgr_frame, cv::COLOR_YUV2BGR_NV12);
// saving from source 0 just for testing
if (frame_meta->batch_id == 0) {
// -----------------------------
// push back frame to the frames vector
// if certain condition occurred, save last x frames as a video with opencv video writer
// -----------------------------
}
}
This is an attempted workaround to the memory leak issue of the smart-recording feature (Memory leak in test5-app with smart-record) which has not been resolved yet.
Please reply ASAP.
Thank you.