在Jetson Orin NX上无法使用opencv直接录制h264/h265视频流（h264格式的视频流才能在浏览器播放）
解决：
软件编码：需要源码编译opencv
1.环境准备
pip uninstall opencv-python
sudo apt install build-essential cmake git python3-dev python3-numpy \
libavcodec-dev libavformat-dev libswscale-dev \
libgstreamer-plugins-base1.0-dev \
libgstreamer1.0-dev libgtk-3-dev \
libpng-dev libjpeg-dev libopenexr-dev libtiff-dev libwebp-dev \
libopencv-dev x264 libx264-dev libssl-dev ffmpeg
2.源码编译（大概需要1h）
python -m pip install --no-binary opencv-python opencv-python
import cv2
cap = cv2.VideoCapture("/home/ssa/test_video/20250327_105503.mp4")
while True:ret, img= cap.read()if not ret:print("无法获取帧")breaklocal_video_path = f"xxxxx.mp4"fourcc = cv2.VideoWriter_fourcc(*'avc1')out = cv2.VideoWriter(local_video_path, fourcc, self.fps, (img.shape[1], img.shape[0]))out.write(img)
avc1是唯一能够软件编码h264的opencv的编码器
硬件编码：需要硬件编码器
1.环境安装
sudo apt install -y libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev
sudo apt install -y libgstreamer-plugins-bad1.0-dev gstreamer1.0-plugins-base
sudo apt install -y gstreamer1.0-plugins-good gstreamer1.0-plugins-bad
sudo apt install -y gstreamer1.0-plugins-ugly gstreamer1.0-libav gstreamer1.0-doc
sudo apt install -y gstreamer1.0-tools gstreamer1.0-x gstreamer1.0-alsa
sudo apt install -y gstreamer1.0-gl gstreamer1.0-gtk3 gstreamer1.0-qt5
sudo apt install -y gstreamer1.0-pulseaudio
sudo apt install -y gtk-doc-tools
sudo apt install -y libeigen3-dev libfmt-dev v4l-utils
2.代码实现
import cv2# 视频源（摄像头或文件）
cap = cv2.VideoCapture(0) # 0表示默认摄像头
# 或从RTSP流读取：
# cap = cv2.VideoCapture("rtsp://xxxxx")# 获取视频参数
fps = cap.get(cv2.CAP_PROP_FPS)
width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))# 自定义视频文件名
video_filename = "output.mp4" # 可修改为任意名称
# 也可以通过用户输入来动态设置文件名
# video_filename = input("请输入保存的视频文件名：") + ".mp4"# GStreamer输出管道（使用NVENC H.264硬件编码）
output_pipeline = (f"appsrc ! video/x-raw, format=BGR ! "f"videoconvert ! video/x-raw, format=I420 ! "f"nvvidconv ! "f"nvv4l2h264enc insert-sps-pps=1 preset-level=1 bitrate=4000000 ! "f"h264parse ! "f"qtmux ! "f"filesink location={video_filename} sync=0"
)# 初始化VideoWriter
out = cv2.VideoWriter(output_pipeline, cv2.CAP_GSTREAMER, 0, fps, (width, height)
)if not out.isOpened():print("Error: 无法打开输出流")exit()print(f"视频将保存为: {video_filename}")# 读取并写入视频帧
while cap.isOpened():ret, frame = cap.read()if not ret:breakout.write(frame)cv2.imshow('Frame', frame)if cv2.waitKey(1) & 0xFF == ord('q'):break# 释放资源
cap.release()
out.release()
cv2.destroyAllWindows()
print(f"视频已成功保存为: {video_filename}")
)
