英文:
Use nvvidconv to flip frame in 2 direction at the same time with Python OpenCV on Jetson Nano
问题
根据Accelerated_GStreamer_User_Guide_Release_24.2.1文档，nvvidconv提供了7种翻转帧的方法。
我想同时使用nvvidconv flip-method=4和nvvidconv flip-method=6。我应该如何在Jetson Nano上使用Python和cv2编写GStreamer管道？
代码部分不需要翻译。以下是修改后的代码：
import cv2width = 640height = 480framerate = 30gs_pipeline = f"v4l2src device=/dev/video0 io-mode=2 " \f"! image/jpeg, width={width}, height={height}, framerate={framerate}/1, format=MJPG " \f"! nvv4l2decoder mjpeg=1 " \f"! nvvidconv flip-method=4 ! nvvidconv flip-method=6 " \f"! video/x-raw, format=BGRx " \f"! videoconvert " \f"! video/x-raw, format=BGR " \f"! appsink drop=1"gs_pipeline = gs_pipelineprint(f"gst-launch-1.0 {gs_pipeline}\n")v_cap = cv2.VideoCapture(gs_pipeline, cv2.CAP_GSTREAMER)if not v_cap.isOpened():print("failed to open video capture")v_cap.release()exit(-1)while v_cap.isOpened():ret_val, frame = v_cap.read()if not ret_val:breakcv2.imshow('', frame)input_key = cv2.waitKey(1)if input_key != -1:print(f"input key = {input_key}")if input_key == ord('q'):breakv_cap.release()cv2.destroyAllWindows()
英文:
According to docummentation Accelerated_GStreamer_User_Guide_Release_24.2.1, nvvidconv provide 7 method to flip the frame.
I want to do nvvidconv flip-method=4 and nvvidconv flip-method=6 at the same time. How should I write the gstreamer pipeline in Python with cv2 on Jetson Nano?
The Code:
import cv2width = 640height = 480framerate = 30gs_pipeline = f"v4l2src device=/dev/video0 io-mode=2 " \f"! image/jpeg, width={width}, height={height}, framerate={framerate}/1, format=MJPG " \f"! nvv4l2decoder mjpeg=1 " \f"! nvvidconv flip-method=[4, 6] " \f"! video/x-raw, format=BGRx " \f"! videoconvert " \f"! video/x-raw, format=BGR " \f"! appsink drop=1"gs_pipeline = gs_pipelineprint(f"gst-launch-1.0 {gs_pipeline}\n")v_cap = cv2.VideoCapture(gs_pipeline, cv2.CAP_GSTREAMER)if not v_cap.isOpened():print("failed to open video capture")v_cap.release()exit(-1)while v_cap.isOpened():ret_val, frame = v_cap.read()if not ret_val:breakcv2.imshow('', frame)input_key = cv2.waitKey(1)if input_key != -1:print(f"input key = {input_key}")if input_key == ord('q'):breakv_cap.release()cv2.destroyAllWindows()
答案1
得分: 0
水平和垂直翻转相当于180度旋转，所以只需使用：
... ! nvvidconv flip-method=2 ! ...
英文:
Flipping horizontally and vertically would be equivalent to 180° rotation, so just use:
... ! nvvidconv flip-method=2 ! ...
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