音视频学习--H264解析渲染

一、H264文件获取

　　下载一段MP4文件，通过FFMPEG转换成MP4

ffmpeg -i Gravity.mp4 -vcodec h264 out_2.264

二、通过解析H264成帧，然后刷新

　　这里的环境是 MacOS  + Python2.7 + openCV2

#!/usr/local/bin/python2.7
# -*- coding: utf-8 -*-
__author__ = ‘qqvipfunction‘

import sys
import cv2
import os
import datetime

#打印时间戳
def Log(str):
    print(datetime.datetime.now().strftime(‘%Y-%m-%d %H:%M:%S.%f‘) + ": " + str)

#cv2.waitKey ,填写0表示永久等待，正数表示等待多少毫秒，如果按键返回按键的值

if __name__ == ‘__main__‘:
    h264_path = os.getcwd() + ‘/rsc/gravity/out.h264‘
    Log(h264_path)

    loop = True
    frameCount = 0
    cap = cv2.VideoCapture(h264_path)
    while (cap.isOpened() and loop):
        Log("frame " + str(frameCount))
        frameCount = frameCount + 1
        ret, frame = cap.read()
        if ret:
            gray = cv2.cvtColor(frame, cv2.COLOR_BGR2BGRA)
            cv2.imshow(‘frame‘, gray)
            if cv2.waitKey(1) & 0xFF == ord(‘q‘):
                loop = False
                break
        else:
            print("Parse H264 failed " + ret)
    cap.release()
    cv2.destroyAllWindows()

三、效果