# Amb82-mini as USB camera with NN overlay not working **URL:** \ **Category:** AI\ **Tags:** evb-amb82\ **Created:** [April 17, 2025, 11:45am UTC](https://forum.amebaiot.com/t/amb82-mini-as-usb-camera-with-nn-overlay-not-working/4051 "2025-04-17T11:45:27Z")\ **Posts on this page:** 2\ **Page:** 1

**Author:** ![Geo\_Muir](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.amebaiot.com/geo_muir/32/2571_2.png) [@Geo\_Muir](https://forum.amebaiot.com/u/Geo_Muir)\ **Post date:** [April 17, 2025, 11:45am UTC](https://forum.amebaiot.com/t/amb82-mini-as-usb-camera-with-nn-overlay-not-working/4051/1 "2025-04-17T11:45:27Z")

I have the object detection working and it working as a UVC Camera device working after enabling only X264 in UVCD\_pram.h. but when i try and run both together it always crashes. ```auto #include "WiFi.h" #include "StreamIO.h" #include "VideoStream.h" #include "RTSP.h" #include "NNObjectDetection.h" #include "VideoStreamOverlay.h" #include "ObjectClassList.h" #include "UVCD.h" #define CHANNEL 0 #define CHANNELNN 3 //#define STREAM_CHANNEL 0 // Lower resolution for NN processing #define NNWIDTH 576 #define NNHEIGHT 320 VideoSetting config(USB_UVCD_STREAM_PRESET); VideoSetting configNN(NNWIDTH, NNHEIGHT, 10, VIDEO_RGB, 0); VideoSetting stream_config(USB_UVCD_STREAM_PRESET); Video camera_uvcd; UVCD usb_uvcd; NNObjectDetection ObjDet; //RTSP rtsp; //StreamIO videoStreamer(1, 1); StreamIO videoStreamerNN(1, 1); StreamIO videoStreamer(1, 1); // 1 Input Video -> 1 Output USB_CAM char ssid[] = "Network_SSID"; // your network SSID (name) char pass[] = "Password"; // your network password int status = WL_IDLE_STATUS; IPAddress ip; int rtsp_portnum; void setup() { Serial.begin(115200); // Configure camera video channels with video format information // Adjust the bitrate based on your WiFi network quality config.setBitrate(2 * 1024 * 1024); // Recommend to use 2Mbps for RTSP streaming to prevent network congestion Camera.configVideoChannel(CHANNEL, config); Camera.configVideoChannel(CHANNELNN, configNN); Camera.videoInit(); usb_uvcd.configVideo(stream_config); // Configure object detection with corresponding video format information // Select Neural Network(NN) task and models ObjDet.configVideo(configNN); ObjDet.modelSelect(OBJECT_DETECTION, DEFAULT_YOLOV4TINY, NA_MODEL, NA_MODEL); ObjDet.begin(); // Configure StreamIO object to stream data from camera video channel to usb_uvcd videoStreamer.registerInput(camera_uvcd.getStream(CHANNEL)); videoStreamer.registerOutput(usb_uvcd); if (videoStreamer.begin() != 0) { Serial.println("USB link start failed"); } // Configure StreamIO object to stream data from video channel to RTSP // videoStreamer.registerInput(Camera.getStream(CHANNEL)); //// videoStreamer.registerOutput(rtsp); // if (videoStreamer.begin() != 0) { // Serial.println("RTSP link start failed"); // } // Start data stream from video channel camera_uvcd.channelBegin(CHANNEL); // Camera.channelBegin(CHANNEL); // Configure StreamIO object to stream data from RGB video channel to object detection videoStreamerNN.registerInput(Camera.getStream(CHANNELNN)); videoStreamerNN.setStackSize(); videoStreamerNN.setTaskPriority(); videoStreamerNN.registerOutput(ObjDet); if (videoStreamerNN.begin() != 0) { Serial.println("StreamIO link start failed"); } // Start video channel for NN Camera.channelBegin(CHANNELNN); // Start OSD drawing on RTSP video channel // OSD.configVideo(CHANNEL, config); // OSD.begin(); } void loop() { std::vector results = ObjDet.getResult(); uint16_t im_h = config.height(); uint16_t im_w = config.width(); Serial.print("Network URL for RTSP Streaming: "); Serial.print("rtsp://"); Serial.print(ip); Serial.print(":"); Serial.println(rtsp_portnum); Serial.println(" "); printf("Total number of objects detected = %d\r\n", ObjDet.getResultCount()); OSD.createBitmap(CHANNEL); if (ObjDet.getResultCount() > 0) { for (int i = 0; i < ObjDet.getResultCount(); i++) { int obj_type = results[i].type(); if (itemList[obj_type].filter) { // check if item should be ignored ObjectDetectionResult item = results[i]; // Result coordinates are floats ranging from 0.00 to 1.00 // Multiply with RTSP resolution to get coordinates in pixels int xmin = (int)(item.xMin() * im_w); int xmax = (int)(item.xMax() * im_w); int ymin = (int)(item.yMin() * im_h); int ymax = (int)(item.yMax() * im_h); // Draw boundary box printf("Item %d %s:\t%d %d %d %d\n\r", i, itemList[obj_type].objectName, xmin, xmax, ymin, ymax); OSD.drawRect(CHANNEL, xmin, ymin, xmax, ymax, 3, OSD_COLOR_WHITE); // Print identification text char text_str[20]; snprintf(text_str, sizeof(text_str), "%s %d", itemList[obj_type].objectName, item.score()); OSD.drawText(CHANNEL, xmin, ymin - OSD.getTextHeight(CHANNEL), text_str, OSD_COLOR_CYAN); } } } OSD.update(CHANNEL); // delay to wait for new results delay(100); } ``` ```auto input param 0 data_format 2 memory_type 0 num_of_dims 4 quant_format 2 quant_data , scale=0.003922, zero_point=0 sizes 416 416 3 1 0 0 output param 0 data_format 2 memory_type 0 num_of_dims 4 quant_format 2 quant_data , scale=0.137945, zero_point=178 sizes 13 13 255 1 0 0 output param 1 data_format 2 memory_type 0 num_of_dims 4 quant_format 2 quant_data , scale=0.131652, zero_point=193 sizes 26 26 255 1 0 0 --------------------------------- HASHMAP ->70223a44(record-list) INIT SUCCESS [ERROR] Input not initialized correctly! [LINKER Err]mm siso: input or output not setUSB link start failed hal_voe_ready 0x0 0xbf1208 read fcs_status 0x000000bf [video_init] uvcd iq is null, use default. [video_init] uvcd SNR is null, use default. IQ:FW size (3) sensor:date 21586/76/56 version:735B�� sensor:FW size (-1) Bus Fault: SCB Configurable Fault Status Reg = 0x00000400 Bus Fault Status: BusFault Address Reg is invalid(Asyn. BusFault) Imprecise data bus error: a data bus error has occurred, but the return address in the stack frame is not related to the instruction that caused the error. S-domain exception from Handler mode, Standard Stack frame on S-MSP Registers Saved to stack ``` ---

**Author:** ![KaiFai\_Y](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.amebaiot.com/kaifai_y/32/2252_2.png) [@KaiFai\_Y](https://forum.amebaiot.com/u/KaiFai_Y)\ **Post date:** [June 4, 2025, 9:01am UTC](https://forum.amebaiot.com/t/amb82-mini-as-usb-camera-with-nn-overlay-not-working/4051/2 "2025-06-04T09:01:16Z")

Hi @Geo_Muir, we’ve already updated our UVCD library. Please try testing it again. If the problem still persists, feel free to post again and we can discuss further. Thank you.