ffmpeg之读取视频帧

main.cpp代码如下

#include "myplayer.h"
#include 
#pragma comment(lib,"avformat.lib")
#pragma comment(lib,"avutil.lib")
#pragma comment(lib,"avcodec.lib")
extern "C"{
#include 
}
static double r2d(AVRational r){
	return r.num == 0 || r.den == 0 ? 0. : (double)r.num / (double)r.den;
}
int main(int argc, char *argv[])
{
	av_register_all();
	char *path = "test.mp4";
	AVFormatContext *ac = NULL;
	int re = avformat_open_input(&ac, path, 0, 0);
	
	if (re != 0){//打开文件失败
		char buf[1024] = { 0 };
		av_strerror(re, buf, sizeof(buf));
		printf("file %s open failed because of : %s", path, buf);
		getchar();
		return -1;
	}
	
	int totalSec = ac->duration / AV_TIME_BASE;
	printf("指定的视频文件有 %d分%d秒\n", totalSec / 60, totalSec % 60);
	for (;;){
		AVPacket pkt;
		re = av_read_frame(ac, &pkt);
		if (re != 0){
			break;
		}
		int pts = pkt.pts * r2d(ac->streams[pkt.stream_index]->time_base) * 1000;//得到帧的毫秒值
		printf("pts = %d 毫秒\n", pts);
		av_packet_unref(&pkt);
	}
	

	avformat_close_input(&ac);

	QApplication a(argc, argv);
	MyPlayer w;
	w.show();
	return a.exec();
}

运行结果：