Python结合ffmpeg 实现单线程和多线程推流

import cv2 as cv
import subprocess as sp


def push_stream():
    # 视频读取对象
    cap = cv.VideoCapture(0) 
    fps = int(cap.get(cv.CAP_PROP_FPS))
    w = int(cap.get(cv.CAP_PROP_FRAME_WIDTH))
    h = int(cap.get(cv.CAP_PROP_FRAME_HEIGHT))
    ret, frame = cap.read()
    # 推流地址
    rtmpUrl = "rtmp://192.168.3.33:1935/live/"
    # 推流参数
    command = ['ffmpeg',
              '-y',
              '-f', 'rawvideo',
              '-vcodec','rawvideo',
              '-pix_fmt', 'bgr24',
              '-s', "{}x{}".format(w, h),
              '-r', str(fps),
              '-i', '-',
              '-c:v', 'libx264',
              '-pix_fmt', 'yuv420p',
              '-preset', 'ultrafast',
              '-f', 'flv', 
              rtmpUrl]
    # 创建、管理子进程
    pipe = sp.Popen(command, stdin=sp.PIPE, bufsize=10 ** 8)
    # 循环读取
    while cap.isOpened():
        # 读取一帧
        ret, frame = cap.read()
        if frame is None:
            print('read frame err!')
            continue
        # 显示一帧
        cv.imshow("frame", frame)
        # 按键退出
        if cv.waitKey(1) & 0xFF == ord('q'):
            break
        # 读取尺寸、推流
        # img=cv.resize(frame,size)
        pipe.stdin.write(frame) 
    # 关闭窗口
    cv.destroyAllWindows()
    # 停止读取
    cap.release()

import queue
import threading
import cv2 as cv
import subprocess as sp


class Live(object):
    def __init__(self):
        self.frame_queue = queue.Queue()
        self.command = ""
        # 自行设置
        self.rtmpUrl = ""
        self.camera_path = ""

    def read_frame(self):
        print("开启推流")
        cap = cv.VideoCapture(self.camera_path)

        # Get video information
        fps = int(cap.get(cv.CAP_PROP_FPS))
        width = int(cap.get(cv.CAP_PROP_FRAME_WIDTH))
        height = int(cap.get(cv.CAP_PROP_FRAME_HEIGHT))

        # ffmpeg command
        self.command = ['ffmpeg',
                       '-y',
                       '-f', 'rawvideo',
                       '-vcodec','rawvideo',
                       '-pix_fmt', 'bgr24',
                       '-s', "{}x{}".format(width, height),
                       '-r', str(fps),
                       '-i', '-',
                       '-c:v', 'libx264',
                       '-pix_fmt', 'yuv420p',
                       '-preset', 'ultrafast',
                       '-f', 'flv', 
                       self.rtmpUrl]

        # read webcamera
        while(cap.isOpened()):
            ret, frame = cap.read()
            if not ret:
                print("Opening camera is failed")
                break

            # put frame into queue
            self.frame_queue.put(frame)

    def push_frame(self):
        # 防止多线程时 command 未被设置
        while True:
            if len(self.command) > 0:
                # 管道配置
                p = sp.Popen(self.command, stdin=sp.PIPE)
                break

        while True:
            if self.frame_queue.empty()!= True:
                frame = self.frame_queue.get()
                # process frame
                # 你处理图片的代码
                # write to pipe
                p.stdin.write(frame.tostring())

    def run(self):
        threads = [
            threading.Thread(target=Live.read_frame, args=(self,)),
            threading.Thread(target=Live.push_frame, args=(self,))
        ]
        [thread.setDaemon(True) for thread in threads]
        [thread.start() for thread in threads]