cv2.videocapture如何外接摄像头
时间: 2023-10-29 11:07:15 浏览: 106
cv2.videocapture 可以用于操作视频捕捉设备,包括本地摄像头或外接摄像头。要使用外接摄像头,需要先确定摄像头的设备号,然后将其传递给cv2.videocapture。可以通过以下方式找到设备号:
1. 打开终端并输入以下命令:ls /dev/video*
2. 摄像头设备应该显示为/dev/video0、/dev/video1等等。记下摄像头设备号。
3. 在Python中使用以下代码打开外接摄像头:
```
import cv2
cap = cv2.VideoCapture(n) # n 是摄像头设备号
```
如果上述代码无法正常工作,则需要使用其他摄像头驱动程序或对设备进行适当的配置。
相关问题
import cv2 camera_path = 0 #0自带摄像头 1外接摄像头 capture = cv2.VideoCapture(camera_path) #初始化播放器 流媒体 fourcc = cv2.VideoWriter_fourcc('D','I','V','X') video_writer = cv2.VideoWriter("image/myself.mp4", fourcc, 25, (960,540)) while True: flag, frame = capture.read() if flag is False: continue frame = cv2.resize(frame,(960,540)) # frame = cv2.flip(frame,0)#翻转 video_writer.write(frame) cv2.namedWindow("video",0) cv2.imshow("video", frame) key = cv2.waitKey(25) if key == 27: video_writer.release() break 如何将这串代码放入上面代码的打开摄像头
如果你想将上面的代码与之前的视频播放器代码结合起来,可以将这段代码放入到play()方法中,用于打开摄像头并将视频流保存到文件中。
以下是修改后的代码示例:
```python
import sys
import cv2
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget, QVBoxLayout, QLabel, QPushButton, QFileDialog, QSlider
from PyQt5.QtMultimedia import QMediaPlayer, QMediaContent
from PyQt5.QtCore import Qt
class VideoPlayer(QMainWindow):
def __init__(self):
super().__init__()
# 创建媒体播放器和媒体控制按钮
self.media_player = QMediaPlayer()
self.play_button = QPushButton('Play')
self.stop_button = QPushButton('Stop')
# 设置布局
layout = QVBoxLayout()
layout.addWidget(self.play_button)
layout.addWidget(self.stop_button)
# 创建一个QWidget作为主窗口的中心部件
widget = QWidget()
widget.setLayout(layout)
self.setCentralWidget(widget)
# 连接按钮的点击事件到相应的槽函数
self.play_button.clicked.connect(self.play)
self.stop_button.clicked.connect(self.stop)
def play(self):
# 打开选择文件对话框,选择要播放的视频文件
file_dialog = QFileDialog()
file_path = file_dialog.getOpenFileName(self, 'Open Video')[0]
# 设置媒体内容并开始播放
media_content = QMediaContent(file_path)
self.media_player.setMedia(media_content)
self.media_player.play()
# 打开摄像头并保存视频流到文件中
camera_path = 0 # 0自带摄像头 1外接摄像头
capture = cv2.VideoCapture(camera_path) # 初始化播放器 流媒体
fourcc = cv2.VideoWriter_fourcc('D', 'I', 'V', 'X')
video_writer = cv2.VideoWriter(file_path, fourcc, 25, (960, 540))
while True:
flag, frame = capture.read()
if flag is False:
continue
frame = cv2.resize(frame, (960, 540))
video_writer.write(frame)
cv2.imshow("video", frame)
key = cv2.waitKey(25)
if key == 27:
video_writer.release()
break
def stop(self):
# 停止播放
self.media_player.stop()
if __name__ == '__main__':
app = QApplication(sys.argv)
player = VideoPlayer()
player.show()
sys.exit(app.exec_())
```
这样,当你点击播放按钮时,会弹出选择视频文件的对话框,选择完视频文件后,程序会同时打开摄像头开始捕捉并保存视频流到所选的视频文件中。同时,视频播放器也会播放选中的视频文件。
希望这个示例能够满足你的需求!如有其他问题,请随时提问。
import sys import cv2 from showPic import Ui_MainWindow from PyQt5 import QtGui from PyQt5.QtCore import * from PyQt5.QtGui import * from PyQt5.QtWidgets import * class videoShow(QMainWindow,Ui_MainWindow): def init(self): super().init() self.setupUi(self) @pyqtSlot() def on_pushButton_record_clicked(self): camera_path = 0 # 0:自带摄像头 1:外接摄像头 "xxx.mp4" "rtsp://admin:pwd@192.168.2.10/cam/..." capture = cv2.VideoCapture(camera_path) # 初始化播放器 流媒体 fourcc = cv2.VideoWriter_fourcc('M', 'P', '4', 'V') # XVID/DIVX MPEG MJPG X264 video_writer = cv2.VideoWriter("image/myself.mp4", fourcc, 25, (960, 540)) # 存放路径、、帧率fps、尺寸(且保证下面的frame也是这个尺寸) while True: flag, frame = capture.read() if flag is False: continue frame = cv2.resize(frame, (960, 540)) video_writer.write(frame) cv2.imshow("video", frame) key = cv2.waitKey(25) if key == 27: video_writer.release() break @pyqtSlot() def on_pushButton_play_clicked(self): video_path = "image/myself.mp4" # 已经录制好的视频路径 capture = cv2.VideoCapture(video_path) # 初始化播放器 while True: flag, frame = capture.read() if flag is False: break cv2.imshow("video", frame) key = cv2.waitKey(25) if key == 27: break capture.release() if name == 'main': app = QApplication(sys.argv) ui = videoShow() ui.show() sys.exit(app.exec_())在这个代码的基础上修改成点击按钮停止,就停止录制并保存视频
要在点击按钮时停止录制并保存视频,您可以在`on_pushButton_record_clicked`函数中添加一个停止录制的条件,并在满足条件时释放视频写入器。以下是修改后的代码示例:
```python
import sys
import cv2
from showPic import Ui_MainWindow
from PyQt5 import QtGui
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
class videoShow(QMainWindow,Ui_MainWindow):
def __init__(self):
super().__init__()
self.setupUi(self)
self.recording = False
@pyqtSlot()
def on_pushButton_record_clicked(self):
camera_path = 0 # 0:自带摄像头 1:外接摄像头 "xxx.mp4" "rtsp://admin:pwd@192.168.2.10/cam/..."
capture = cv2.VideoCapture(camera_path) # 初始化播放器 流媒体
fourcc = cv2.VideoWriter_fourcc('M', 'P', '4', 'V') # XVID/DIVX MPEG MJPG X264
video_writer = cv2.VideoWriter("image/myself.mp4", fourcc, 25, (960, 540)) # 存放路径、、帧率fps、尺寸(且保证下面的frame也是这个尺寸)
self.recording = True
while self.recording:
flag, frame = capture.read()
if flag is False:
continue
frame = cv2.resize(frame, (960, 540))
video_writer.write(frame)
cv2.imshow("video", frame)
key = cv2.waitKey(25)
if key == 27:
break
video_writer.release()
@pyqtSlot()
def on_pushButton_play_clicked(self):
video_path = "image/myself.mp4" # 已经录制好的视频路径
capture = cv2.VideoCapture(video_path) # 初始化播放器
while True:
flag, frame = capture.read()
if flag is False:
break
cv2.imshow("video", frame)
key = cv2.waitKey(25)
if key == 27:
break
capture.release()
@pyqtSlot()
def on_pushButton_stop_clicked(self):
self.recording = False
if __name__ == '__main__':
app = QApplication(sys.argv)
ui = videoShow()
ui.show()
sys.exit(app.exec_())
```
在修改后的代码中,我们添加了一个名为`recording`的属性来跟踪录制状态。在`on_pushButton_record_clicked`函数中,我们在循环中检查`self.recording`的值,如果它为False,则停止录制并释放视频写入器。我们还添加了一个名为`on_pushButton_stop_clicked`的槽函数,用于在点击停止按钮时将`self.recording`设置为False,从而停止录制。请确保在UI文件中存在一个名为`pushButton_stop`的按钮,并将其与`on_pushButton_stop_clicked`槽函数关联。