# Multiple probe function Deepstream C **URL:** \ **Category:** DeepStream SDK\ **Tags:** gstreamer, deepstream\ **Created:** [January 27, 2024, 2:59pm UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355 "2024-01-27T14:59:51Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![mithunhr](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@mithunhr](https://forums.developer.nvidia.com/u/mithunhr)\ **Post date:** [January 27, 2024, 2:59pm UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/1 "2024-01-27T14:59:51Z")
## Environment: **GPU Type** : RTX 3070Ti **Nvidia Driver Version** : 535.146.02 **CUDA Version** : 12.2 **Operating System + Version** : Ubuntu 22.04 @yuweiw @Amycao @yingliu @pshin @fanzh I am working on encoding images based on the image-meta-test example. Currently, I am saving the first object detected along with the bounding box in the frame whereas other bounding boxes will not appear. But in this case, the inference video will also be suppressed as I have put some conditions. How Can I get a full inference video running on display along with my condition where only save the first object detected with the bounding box? Should I add another probe function or is there anything else to be done? Please help. This is the modified code and outputs. Thank You [image-meta-test.txt](https://forums.developer.nvidia.com/uploads/short-url/jNU7oQ46MSm7S7kukYqO9Rk5PuE.txt) (21.6 KB) ![image](https://global.discourse-cdn.com/nvidia/original/4X/f/e/3/fe3abbdab7574dfc2cdcbc2f7edb05e93f12c975.jpeg) ---
**Author:** ![mithunhr](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@mithunhr](https://forums.developer.nvidia.com/u/mithunhr)\ **Post date:** [January 28, 2024, 4:41am UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/3 "2024-01-28T04:41:53Z")
@yuweiw @Amycao @yingliu @pshin @fanzh Should I use the tee element for my application? One for full inference video running and another for saving frames with single bounding images without disturbing the inference video. ---
**Author:** ![yuweiw](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/yuweiw/32/101255_2.png) [@yuweiw](https://forums.developer.nvidia.com/u/yuweiw)\ **Post date:** [January 29, 2024, 2:14am UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/4 "2024-01-29T02:14:31Z")
You can filter the bboxes you want and make the others transparent.Please refer to the `border_color` parameter in the `NvOSD_RectParams` structure. ---
**Author:** ![mithunhr](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@mithunhr](https://forums.developer.nvidia.com/u/mithunhr)\ **Post date:** [January 29, 2024, 8:55am UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/5 "2024-01-29T08:55:15Z")
```auto static GstPadProbeReturn osd_src_pad_buffer_probe (GstPad * pad, GstPadProbeInfo * info, gpointer ctx) { GstBuffer *buf = (GstBuffer *) info->data; GstMapInfo inmap = GST_MAP_INFO_INIT; if (!gst_buffer_map (buf, &inmap, GST_MAP_READ)) { GST_ERROR ("input buffer mapinfo failed"); return GST_PAD_PROBE_DROP; } NvBufSurface *ip_surf = (NvBufSurface *) inmap.data; gst_buffer_unmap (buf, &inmap); NvDsObjectMeta *obj_meta = NULL; guint vehicle_count = 0; guint person_count = 0; NvDsMetaList *l_frame = NULL; NvDsMetaList *l_obj = NULL; NvDsBatchMeta *batch_meta = gst_buffer_get_nvds_batch_meta (buf); const gchar *calc_enc_str = g_getenv ("CALCULATE_ENCODE_TIME"); gboolean calc_enc = !g_strcmp0 (calc_enc_str, "yes"); for (l_frame = batch_meta->frame_meta_list; l_frame;l_frame = l_frame->next) { NvDsFrameMeta *frame_meta = (NvDsFrameMeta *) (l_frame->data); NvDsObjectMeta *obj_meta = (NvDsObjectMeta *) l_obj->data; NvDsObjEncUsrArgs frameData = { 0 }; /* Preset */ frameData.isFrame = 1; /* To be set by user */ frameData.saveImg = TRUE; sprintf(frameData.fileNameImg,"/opt/nvidia/deepstream/deepstream-6.4/sources/apps/sample_apps/image_save/pics/%d.jpg",frame_count); frameData.attachUsrMeta = TRUE; /* Set if Image scaling Required */ frameData.scaleImg = FALSE; frameData.scaledWidth = 0; frameData.scaledHeight = 0; obj_meta->rect_params.width= frame_meta->source_frame_width; obj_meta->rect_params.height= frame_meta->source_frame_height; obj_meta->rect_params.top= 0.0f; obj_meta->rect_params.left= 0.0f; obj_meta->rect_params.border_width = 0; /* Quality */ frameData.quality = 80; /* Set to calculate time taken to encode JPG image. */ if (calc_enc) { frameData.calcEncodeTime = 1; } /* Main Function Call */ nvds_obj_enc_process (ctx, &frameData, ip_surf, obj_meta, frame_meta); } nvds_obj_enc_finish (ctx); frame_count++; return GST_PAD_PROBE_OK; } ``` The app won’t run if I try to change in obj\_meta in this function. @yuweiw ---
**Author:** ![yuweiw](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/yuweiw/32/101255_2.png) [@yuweiw](https://forums.developer.nvidia.com/u/yuweiw)\ **Post date:** [January 29, 2024, 10:56am UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/6 "2024-01-29T10:56:36Z")
What do you mean `The app won’t run`? If there are some error prints, you can attach the log. ---
**Author:** ![mithunhr](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@mithunhr](https://forums.developer.nvidia.com/u/mithunhr)\ **Post date:** [January 29, 2024, 11:08am UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/7 "2024-01-29T11:08:10Z")
> **[Screencast from 29-01-24 04\_29\_26 PM IST.mp4](https://drive.google.com/file/d/19nJdBi9Ok3wcFGP3vge40HgkGcpjyiNX/view?usp=drive_link)** > > Google Drive file. While running the app, the following is taking place.@yuweiw ---
**Author:** ![yuweiw](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/yuweiw/32/101255_2.png) [@yuweiw](https://forums.developer.nvidia.com/u/yuweiw)\ **Post date:** [January 30, 2024, 2:25am UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/8 "2024-01-30T02:25:41Z")
It’s a crash issue from your recorded video. You can use the `gdb` tool to initially analyze the cause of the problem. ```auto $gdb $r After the crash: $bt ``` ---
**Author:** ![mithunhr](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@mithunhr](https://forums.developer.nvidia.com/u/mithunhr)\ **Post date:** [January 30, 2024, 3:41am UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/9 "2024-01-30T03:41:01Z")
Hello @yuweiw Here are the results when I ran the debugger. ![Screenshot from 2024-01-30 09-10-01](https://global.discourse-cdn.com/nvidia/original/4X/6/f/8/6f881f2fe1cb3eb7b4846a08b79c35833cf1407c.png) ![Screenshot from 2024-01-30 09-09-28](https://global.discourse-cdn.com/nvidia/original/4X/e/f/6/ef6055a0fede9528eb22d71fdda2a88e4de6bc42.png) ---
**Author:** ![yuweiw](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/yuweiw/32/101255_2.png) [@yuweiw](https://forums.developer.nvidia.com/u/yuweiw)\ **Post date:** [January 30, 2024, 6:42am UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/10 "2024-01-30T06:42:05Z")
It seems like crashing in the `start_thread` from you picture. You can figure out by yourself what’s wrong in your code by commenting out that bit by bit that you’ve added yourself. ---
**Author:** ![mithunhr](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@mithunhr](https://forums.developer.nvidia.com/u/mithunhr)\ **Post date:** [January 31, 2024, 6:55am UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/11 "2024-01-31T06:55:41Z")
Hello @yuweiw I want to do the same thing that is happening in deepstream\_imagedata-multistream.py Where the single object is detected and saved as an image using OpenCV in python. Can I replicate that in deepstream C using nvds\_obj\_enc( ) ? ---
**Author:** ![yuweiw](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/yuweiw/32/101255_2.png) [@yuweiw](https://forums.developer.nvidia.com/u/yuweiw)\ **Post date:** [January 31, 2024, 10:55am UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/12 "2024-01-31T10:55:45Z")
You can refer to our demo code:`sources\apps\sample_apps\deepstream-image-meta-test`. ---
**Author:** ![mithunhr](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@mithunhr](https://forums.developer.nvidia.com/u/mithunhr)\ **Post date:** [January 31, 2024, 12:04pm UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/13 "2024-01-31T12:04:41Z")
Yes I working on the same @yuweiw It is encoding all the detected objects and frames. But how to encode object with bounding box with full frame ? ---
**Author:** ![yuweiw](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/yuweiw/32/101255_2.png) [@yuweiw](https://forums.developer.nvidia.com/u/yuweiw)\ **Post date:** [February 1, 2024, 1:51am UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/14 "2024-02-01T01:51:12Z")
> [@mithunhr](#): > > But how to encode object with bounding box with full frame ? You just need to port the code we provided in your previous topic [279003](https://forums.developer.nvidia.com/t/save-image-frame-with-bounding-box-in-c-application/279003). ---
**Author:** ![mithunhr](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@mithunhr](https://forums.developer.nvidia.com/u/mithunhr)\ **Post date:** [February 1, 2024, 3:37am UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/15 "2024-02-01T03:37:22Z")
Yes with the help of that code and modifying the sinkpad probe I am able to save the single object with bounding box in full frame. But it’s affecting the OSD. So I am asking you is there anyway without affecting the OSD to save the images. ---
**Author:** ![yuweiw](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/yuweiw/32/101255_2.png) [@yuweiw](https://forums.developer.nvidia.com/u/yuweiw)\ **Post date:** [February 1, 2024, 7:16am UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/16 "2024-02-01T07:16:37Z")
What do you mean `it’s affecting the OSD`? ---
**Author:** ![mithunhr](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@mithunhr](https://forums.developer.nvidia.com/u/mithunhr)\ **Post date:** [February 1, 2024, 8:04am UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/17 "2024-02-01T08:04:59Z")
nvds\_obj\_enc is encoding the images based on nvosd i.e. What I am changing in osd\_sink\_pad\_probe(). In osd sink pad probe I have put a condition to display only the first vehicle detected. So the images saved are only the single vehicle detected with full frame with bounding box. `(I have attached the image in my first post)` I want the display to detect all the objects normally but the images to be saved should be a single object with a bounding box with a full frame. So, I mentioned to you the deepstream\_imagedata\_multistream.py There the display is not touched but images are saved with a single object with the bounding box in full frame. My OSD sink pad probe function is as follows: ```auto static GstPadProbeReturn osd_sink_pad_buffer_probe (GstPad * pad, GstPadProbeInfo * info, gpointer u_data) { GstBuffer *buf = (GstBuffer *) info->data; NvDsFrameMeta *frame_meta = NULL; NvOSD_TextParams *txt_params = NULL; NvOSD_TextParams *txt_params1 = NULL; guint vehicle_count = 0; guint person_count = 0; gboolean is_first_object; NvDsMetaList *l_frame, *l_obj; NvDsBatchMeta *batch_meta = gst_buffer_get_nvds_batch_meta (buf); NvDsDisplayMeta *display_meta = NULL; if (!batch_meta) { // No batch meta attached. return GST_PAD_PROBE_OK; } for (l_frame = batch_meta->frame_meta_list; l_frame; l_frame = l_frame->next) { frame_meta = (NvDsFrameMeta *) l_frame->data; if (frame_meta == NULL) { // Ignore Null frame meta. continue; } is_first_object = FALSE; for (l_obj = frame_meta->obj_meta_list; l_obj; l_obj = l_obj->next) { NvDsFrameMeta *frame_meta = (NvDsFrameMeta *) (l_frame->data); NvDsObjectMeta *obj_meta = (NvDsObjectMeta *) l_obj->data; int offset = 0; if (obj_meta == NULL) { // Ignore Null object. continue; } txt_params = &(obj_meta->text_params); if (txt_params->display_text) g_free (txt_params->display_text); txt_params->display_text = (char *)g_malloc0 (MAX_DISPLAY_LEN); if (obj_meta->class_id == PGIE_CLASS_ID_VEHICLE) { vehicle_count++; if(vehicle_count == 1) { g_snprintf (txt_params->display_text, MAX_DISPLAY_LEN, "%s ", pgie_classes_str[obj_meta->class_id]); obj_meta->rect_params.border_color.red = 0; obj_meta->rect_params.border_color.green = 1.0; obj_meta->rect_params.border_color.blue = 0; } else{ obj_meta->rect_params.border_width = 0; txt_params->font_params.font_size = 0; txt_params->font_params.font_color.red = 0; txt_params->font_params.font_color.green = 0; txt_params->font_params.font_color.blue = 0; txt_params->font_params.font_color.alpha = 0; txt_params->set_bg_clr = 0; txt_params->text_bg_clr.red = 0.0; txt_params->text_bg_clr.green = 0.0; txt_params->text_bg_clr.blue = 0.0; txt_params->text_bg_clr.alpha = 0; } } if (obj_meta->class_id == PGIE_CLASS_ID_PERSON) person_count++; obj_meta->rect_params.border_width = 1; txt_params->x_offset = obj_meta->rect_params.left; txt_params->y_offset = obj_meta->rect_params.top - 25; /* Font , font-color and font-size */ txt_params->font_params.font_name = (char *) "Arial"; txt_params->font_params.font_size = 15; txt_params->font_params.font_color.red = 1.0; txt_params->font_params.font_color.green = 1.0; txt_params->font_params.font_color.blue = 1.0; txt_params->font_params.font_color.alpha = 1.0; /* Text background color */ txt_params->set_bg_clr = 1; txt_params->text_bg_clr.red = 0.0; txt_params->text_bg_clr.green = 0.0; txt_params->text_bg_clr.blue = 0.0; txt_params->text_bg_clr.alpha = 0.5; NvDsUserMeta *user_event_meta = nvds_acquire_user_meta_from_pool (batch_meta); if (user_event_meta) { nvds_add_user_meta_to_frame (frame_meta, user_event_meta); } else { g_print ("Error in attaching event meta to buffer\n"); } is_first_object = TRUE; } } g_print ("Frame Number = %d " "Vehicle Count = %d Person Count = %d\n", frame_number, vehicle_count, person_count); frame_number++; return GST_PAD_PROBE_OK; } ``` `I have attached the full code in my first post.` Please help me to figure out this @yuweiw Thank You ---
**Author:** ![yuweiw](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/yuweiw/32/101255_2.png) [@yuweiw](https://forums.developer.nvidia.com/u/yuweiw)\ **Post date:** [February 1, 2024, 10:53am UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/18 "2024-02-01T10:53:05Z")
> [@mithunhr](#): > > I want the display to detect all the objects normally but the images to be saved should be a single object with a bounding box with a full frame. We do not support this feature. If you want to do this, you’ll need to save the image yourself and draw the bbox yourself in the saved image. ---
**Author:** ![mithunhr](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@mithunhr](https://forums.developer.nvidia.com/u/mithunhr)\ **Post date:** [February 1, 2024, 11:03am UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/19 "2024-02-01T11:03:39Z")
How to get bounding box info to draw using OpenCV? Is there any function to get bounding box info? ---
**Author:** ![rajupadhyay59](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@rajupadhyay59](https://forums.developer.nvidia.com/u/rajupadhyay59)\ **Post date:** [February 1, 2024, 10:57pm UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/20 "2024-02-01T22:57:30Z")
What if you use NvDsDisplayMeta’s rect\_params to get bbox info in your probe function. Then you draw the bbox on the first object and then just break out of the loop. [https://docs.nvidia.com/metropolis/deepstream/5.0/dev-guide/DeepStream\_Development\_Guide/baggage/structNvDsDisplayMeta.html](https://docs.nvidia.com/metropolis/deepstream/5.0/dev-guide/DeepStream_Development_Guide/baggage/structNvDsDisplayMeta.html) ---
**Author:** ![mithunhr](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@mithunhr](https://forums.developer.nvidia.com/u/mithunhr)\ **Post date:** [February 2, 2024, 1:29am UTC](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355/21 "2024-02-02T01:29:14Z")
Ok Thank You By any chance can I have two sink\_pad \_probe functions and link them with the src\_pad\_probe function? [Next page](https://forums.developer.nvidia.com/t/multiple-probe-function-deepstream-c/280355.md?page=2)