Problems with test 1 usb camera

hi,
i’m unable to run the live camera first sample. i’m trying with onboard TX2 camera and i have this message:

"Playing cam /dev/video0 "

all seems good but the last message i have is this:
“5): gst_base_src_loop (): /GstPipeline:pipeline0/GstV4l2Src:usb-cam-source:
streaming stopped, reason not-negotiated (-4)”

I link all the terminal code:
"python3 deepstream_test_1_usb.py /dev/video0
Creating Pipeline

Creating Source

Creating Video Converter

Creating EGLSink

Playing cam /dev/video0
Warn: ‘threshold’ parameter has been deprecated. Use ‘pre-cluster-threshold’ instead.
Adding elements to Pipeline

Linking elements in the Pipeline

Starting pipeline

Using winsys: x11
ERROR: Deserialize engine failed because file path: /opt/nvidia/deepstream/deepstream-5.0/sources/python/apps/deepstream-test1-usbcam/…/…/…/…/samples/models/Primary_Detector/resnet10.caffemodel_b1_gpu0_int8.engine open error
0:00:01.969732906 20476 0x30cbe4c0 WARN nvinfer gstnvinfer.cpp:599:gst_nvinfer_logger: NvDsInferContext[UID 1]: Warning from NvDsInferContextImpl::deserializeEngineAndBackend() <nvdsinfer_context_impl.cpp:1566> [UID = 1]: deserialize engine from file :/opt/nvidia/deepstream/deepstream-5.0/sources/python/apps/deepstream-test1-usbcam/…/…/…/…/samples/models/Primary_Detector/resnet10.caffemodel_b1_gpu0_int8.engine failed
0:00:01.969833708 20476 0x30cbe4c0 WARN nvinfer gstnvinfer.cpp:599:gst_nvinfer_logger: NvDsInferContext[UID 1]: Warning from NvDsInferContextImpl::generateBackendContext() <nvdsinfer_context_impl.cpp:1673> [UID = 1]: deserialize backend context from engine from file :/opt/nvidia/deepstream/deepstream-5.0/sources/python/apps/deepstream-test1-usbcam/…/…/…/…/samples/models/Primary_Detector/resnet10.caffemodel_b1_gpu0_int8.engine failed, try rebuild
0:00:01.969895885 20476 0x30cbe4c0 INFO nvinfer gstnvinfer.cpp:602:gst_nvinfer_logger: NvDsInferContext[UID 1]: Info from NvDsInferContextImpl::buildModel() <nvdsinfer_context_impl.cpp:1591> [UID = 1]: Trying to create engine from model files
Warning, setting batch size to 1. Update the dimension after parsing due to using explicit batch size.
WARNING: INT8 not supported by platform. Trying FP16 mode.
INFO: [TRT]: Some tactics do not have sufficient workspace memory to run. Increasing workspace size may increase performance, please check verbose output.
INFO: [TRT]: Detected 1 inputs and 2 output network tensors.
0:00:21.071257136 20476 0x30cbe4c0 INFO nvinfer gstnvinfer.cpp:602:gst_nvinfer_logger: NvDsInferContext[UID 1]: Info from NvDsInferContextImpl::buildModel() <nvdsinfer_context_impl.cpp:1624> [UID = 1]: serialize cuda engine to file: /opt/nvidia/deepstream/deepstream-5.0/samples/models/Primary_Detector/resnet10.caffemodel_b1_gpu0_fp16.engine successfully
INFO: [Implicit Engine Info]: layers num: 3
0 INPUT kFLOAT input_1 3x368x640
1 OUTPUT kFLOAT conv2d_bbox 16x23x40
2 OUTPUT kFLOAT conv2d_cov/Sigmoid 4x23x40

0:00:21.103211330 20476 0x30cbe4c0 INFO nvinfer gstnvinfer_impl.cpp:311:notifyLoadModelStatus: [UID 1]: Load new model:dstest1_pgie_config.txt sucessfully
Error: gst-stream-error-quark: Internal data stream error. (1): gstbasesrc.c(3055): gst_base_src_loop (): /GstPipeline:pipeline0/GstV4l2Src:usb-cam-source:
streaming stopped, reason not-negotiated (-4)
"

Hi,
Please refer to the steps in


And check if you launch the USB camera in gat-launch-1.0 command and see video preview.