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

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1	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

　　

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#!/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