有没有办法录制奇异果视频? [英] is there a way to record videos in kivy?

问题描述

我正在用Kivy显示摄像机视频，但是我找不到录制视频的方法，我尝试使用OpenCV Videowriter，但是由于进行了更新(Clock.schedule_interval(self.update，1.0/33.0))它会不断被覆盖，因此保存的视频只是一张图像，任何人都有其他选择吗?

I am displaying the camera video in Kivy, but I can't find a way to record the video, I tried to use OpenCV Videowriter but because of the updating ( Clock.schedule_interval(self.update, 1.0/33.0)) it is constantly overwriting so the video that it saved is one image, does anybody have an alternative way.

推荐答案

请查看以下符合您目的的代码.主要代码来自以下链接: https://www.codingforentrepreneurs.com/blog/how-to-record-video-in-opencv-python .我仅适用于kivy框架(问题在于kivy解决方案)，并调整了 frame_per_second 以使其与查看&写作速度.

Please look into the below code which may serve your purpose. The main code is taken from the link: https://www.codingforentrepreneurs.com/blog/how-to-record-video-in-opencv-python. I have only adapted for kivy framework (as the question is for kivy solution) and adjusted the frame_per_second to make it consistent with viewing & writing speed.

from kivy.app import App
from kivy.uix.widget import Widget
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.image import Image
from kivy.clock import Clock
from kivy.graphics.texture import Texture
from kivy.properties import StringProperty, NumericProperty

import cv2
import os

# Standard Video Dimensions Sizes
STD_DIMENSIONS =  {
    "480p": (640, 480),
    "720p": (1280, 720),
    "1080p": (1920, 1080),
    "4k": (3840, 2160),
}

# Video Encoding, might require additional installs
# Types of Codes: http://www.fourcc.org/codecs.php
VIDEO_TYPE = {
    'avi': cv2.VideoWriter_fourcc(*'XVID'),
    #'mp4': cv2.VideoWriter_fourcc(*'H264'),
    'mp4': cv2.VideoWriter_fourcc(*'XVID'),
}

class KivyCamera(BoxLayout):
    filename = StringProperty('video.avi')
    frames_per_second = NumericProperty(30.0)
    video_resolution = StringProperty('720p')

    def __init__(self, **kwargs):
        super(KivyCamera, self).__init__(**kwargs)
        self.img1=Image()
        self.add_widget(self.img1)
        self.capture = cv2.VideoCapture(0)
        self.out = cv2.VideoWriter(self.filename, self.get_video_type(self.filename), self.frames_per_second, self.get_dims(self.capture, self.video_resolution))
        Clock.schedule_interval(self.update, 1 / self.frames_per_second)

    def update(self, *args):
        ret, frame = self.capture.read()
        self.out.write(frame)
        buf = cv2.flip(frame, 0).tostring()
        texture = Texture.create(size=(frame.shape[1], frame.shape[0]), colorfmt="bgr")
        texture.blit_buffer(buf, colorfmt="bgr", bufferfmt="ubyte")
        self.img1.texture = texture

    # Set resolution for the video capture
    # Function adapted from https://kirr.co/0l6qmh
    def change_resolution(self, cap, width, height):
        self.capture.set(3, width)
        self.capture.set(4, height)

    # grab resolution dimensions and set video capture to it.
    def get_dims(self, cap, video_resolution='1080p'):
        width, height = STD_DIMENSIONS["480p"]
        if self.video_resolution in STD_DIMENSIONS:
            width, height = STD_DIMENSIONS[self.video_resolution]
        ## change the current caputre device
        ## to the resulting resolution
        self.change_resolution(cap, width, height)
        return width, height

    def get_video_type(self, filename):
        filename, ext = os.path.splitext(filename)
        if ext in VIDEO_TYPE:
          return  VIDEO_TYPE[ext]
        return VIDEO_TYPE['avi']

class CamApp(App):
    def build(self):
        return KivyCamera()

if __name__ == '__main__':
    CamApp().run()

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