将视频文件的每一帧都拆分成一个独立的文件（提取文件中的所有关键帧）

将某一个视频文件的每一帧都拆分出来保存成一个独立的文件，如果需要修改I帧，则可以通过FFmpeg修改文件的GOP大小，命令行如下：

ffmpeg -i video.mp4 -g 10 gop10.mp4

再提取之前需要先做一件事，那就是需要将视频文件改为ES流：

ffmpeg -i gop10.mp4 -vcodec copy -an -f rawvideo -vbsf h264_mp4toannexb es.raw

这个时候就可以用代码将文件拆分出来了，代码如下：（我用的是海思的算法）


#include <stdio.h>
#include <stdlib.h>
#include <iostream>
using namespace std;

int GetVideoFrame(FILE *fp, char **pBuf, int &nBufLen)
{
	bool bLoopSend = false;
	bool bFindStart = false;
	bool bFindEnd = false;
	long s32UsedBytes = 0;
	long iStart = 0;
	char *pu8Addr = NULL;
	int i = 0;
	int MaxCount = 1024 * 512;
	static long framePos = 0;
	int frameLen = 0;

	if (fp == NULL)
	{
		return -2;
	}

	char *pu8Buf = (char *)malloc(MaxCount);
	if (pu8Buf == NULL)
	{
		free(pu8Buf);
		pu8Buf = NULL;


		if (fp != NULL)
		{
			fclose(fp);
			fp = NULL;
		}

		return -2;
	}
	fseek(fp, framePos, SEEK_SET);
	frameLen = fread(pu8Buf, 1, MaxCount, fp);

	if (frameLen == 0)
	{
		framePos = 0;
		fseek(fp, framePos, SEEK_SET);
		frameLen = fread(pu8Buf, 1, MaxCount, fp);
		if (frameLen == 0)
		{
			nBufLen = 0;
			free(pu8Buf);
			pu8Buf = NULL;



			if (fp != NULL)
			{
				fclose(fp);
				fp = NULL;
			}
			return -1;
		}
	}
	else  if (frameLen == -1)
	{
		nBufLen = -1;
		free(pu8Buf);
		pu8Buf = NULL;


		if (fp != NULL)
		{
			fclose(fp);
			fp = NULL;
		}
		return -1;
	}

	for (i = 0; i < frameLen - 8; i++)
	{

		int tmp = pu8Buf[i + 3] & 0x1F;
		if (pu8Buf[i] == 0 && pu8Buf[i + 1] == 0 && pu8Buf[i + 2] == 1 &&
			(
			((tmp == 5 || tmp == 1) && ((pu8Buf[i + 4] & 0x80) == 0x80)) ||
				(tmp == 20 && (pu8Buf[i + 7] & 0x80) == 0x80)
				)
			)
		{
			iStart = i;
			bFindStart = true;
			i += 8;
			break;
		}
	}
	for (; i < frameLen - 8; i++)
	{
		int tmp = pu8Buf[i + 3] & 0x1F;
		if (pu8Buf[i] == 0 && pu8Buf[i + 1] == 0 && pu8Buf[i + 2] == 1 &&
			(
				tmp == 15 || tmp == 7 || tmp == 8 || tmp == 6 ||
				((tmp == 5 || tmp == 1) && ((pu8Buf[i + 4] & 0x80) == 0x80)) ||
				(tmp == 20 && (pu8Buf[i + 7] & 0x80) == 0x80)
				)
			)
		{
			bFindEnd = true;
			break;
		}
	}
	if (i > 0)
		frameLen = i;
	if (!bFindStart)
	{
		printf(" can not find start code! \n");
	}
	else if (!bFindEnd)
	{
		frameLen = i + 8;
	}

	pu8Addr = pu8Buf;
	memcpy(*pBuf, pu8Addr, frameLen);

	nBufLen = frameLen;

	framePos = framePos + frameLen;

	free(pu8Buf);
	pu8Buf = NULL;
	return 0;
}

int EncodeH264File()
{
	while (1)
	{
#if 1
		static int fnum = 0;
		fnum++;
		static FILE *fp = NULL;
		FILE *fps = NULL;
		char fname[10];
		static int nIndex = 0;
		sprintf(fname, "%d.h264", fnum);
		fps = fopen("es.raw", "rb");
		if (!fps)
		{
			//continue;
			return -1;
		}
#if 0//20180814 wll
		nIndex++;
		char *str = "test.h264";
		if (nIndex == 1)
#endif
		{
			fp = fopen(fname, "wb");
			if (!fp)
			{
				//continue;
				return -1;
			}
		}
		char *str = (char *)malloc(1024 * 512);
		int bufLen = 0;
		GetVideoFrame(fps, &str, bufLen);
		fwrite(str, bufLen, 1, fp);
#if 0//20180814 wll
#else
		fclose(fp);
		fp = NULL;
#endif
#endif
	}
}


int main(int argc, char *argv[])
{
	EncodeH264File();
	
	system("pause");
	return 0;
}

直接vs直接运行就可以了，我拆分出来的如下：