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错误描述：
[h264 @ 003e4df0] non-existing PPS 0 referenced
[h264 @ 003e4df0] decode_slice_header error
[h264 @ 003e4df0] non-existing PPS 0 referenced
[h264 @ 003e4df0] decode_slice_header error
 
说明：上面的错误原因是PPS在解码的时候没有被设置
解决方法：
AVCodecContext *pCodecCtx;   //解码环境
pCodecCtx = avcodec_alloc_context();//分配解码环境
 pCodecCtx->extradata = new uint8_t[32];//给extradata成员参数分配内存
 pCodecCtx->extradata_size = 32;//extradata成员参数分配内存大小
 
//给extradata成员参数设置值
 //00 00 00 01 
 pCodecCtx->extradata[0] = 0x00;
 pCodecCtx->extradata[1] = 0x00;
 pCodecCtx->extradata[2] = 0x00;
 pCodecCtx->extradata[3] = 0x01;
 //67 42 80 1e 
 pCodecCtx->extradata[4] = 0x67;
 pCodecCtx->extradata[5] = 0x42;
 pCodecCtx->extradata[6] = 0x80;
 pCodecCtx->extradata[7] = 0x1e;
 //88 8b 40 50 
 pCodecCtx->extradata[8] = 0x88;
 pCodecCtx->extradata[9] = 0x8b;
 pCodecCtx->extradata[10] = 0x40;
 pCodecCtx->extradata[11] = 0x50;
 //1e d0 80 00 
 pCodecCtx->extradata[12] = 0x1e;
 pCodecCtx->extradata[13] = 0xd0;
 pCodecCtx->extradata[14] = 0x80;
 pCodecCtx->extradata[15] = 0x00;
 //03 84 00 00 
 pCodecCtx->extradata[16] = 0x03;
 pCodecCtx->extradata[17] = 0x84;
 pCodecCtx->extradata[18] = 0x00;
 pCodecCtx->extradata[19] = 0x00;
 //af c8 02 00 
 pCodecCtx->extradata[20] = 0xaf;
 pCodecCtx->extradata[21] = 0xc8;
 pCodecCtx->extradata[22] = 0x02;
 pCodecCtx->extradata[23] = 0x00;
 //00 00 00 01 
 pCodecCtx->extradata[24] = 0x00;
 pCodecCtx->extradata[25] = 0x00;
 pCodecCtx->extradata[26] = 0x00;
 pCodecCtx->extradata[27] = 0x01;
 //68 ce 38 80
 pCodecCtx->extradata[28] = 0x68;
 pCodecCtx->extradata[29] = 0xce;
 pCodecCtx->extradata[30] = 0x38;
 pCodecCtx->extradata[31] = 0x80;






Decode() 
{ 
FILE * inpf; 
 
int nWrite; 
int i,p; 
int nalLen; 
unsigned char* Buf; 
int got_picture, consumed_bytes; 
unsigned char *DisplayBuf; 
DisplayBuf=(unsigned char *)malloc(60000); 
 
char outfile[] = "test.pgm"; 
 
//1.打开输入javascript:;" onClick="javascript:tagshow(event, '文件');" target="_self">文件 
inpf = fopen("test.264", "rb"); 
 
//outf = fopen("out.yuv", "wb"); 
 
if(!inpf) 
{ 
goto Decodereturn; 
} 
 
nalLen = 0; 
Buf = (unsigned char*)calloc ( 1000000, sizeof(char)); //准备解码文件缓冲 
 
//2.注册解码器，并且找到H264解码器 
avcodec_init(); 
avcodec_register_all(); 
codec = avcodec_find_decoder(CODEC_ID_H264); 
 
if (!codec) { 
return 0; 
} 
//allocate codec context 
//分配解码器内存 
c = avcodec_alloc_context(); 
 
if(!c){ 
return 0; 
} 
//open codec 
//3.打开解码器 
if (avcodec_open(c, codec) < 0) { 
return 0; 
} 
 
//allocate frame buffer 
//分配解码器用的帧缓冲 
picture = avcodec_alloc_frame(); 
if(!picture){ 
return 0; 
} 
 
rgbdatanew = (unsigned char *)malloc(sizeof(unsigned char)*(3 * width * height)); 
 
while(!feof(inpf)) 
{ 
 
//4.获取下一个NAL的长度,并且将NAL放入Buf 
nalLen = getNextNal(inpf, Buf); 
 
//5.对改NAL解码，解码的YUV数据存在picture中 
consumed_bytes= avcodec_decode_video(c, picture, &got_picture, Buf, nalLen); 
 
if(consumed_bytes > 0) 
{ 
 
//6.将picture中的YUV数据显示或者保存到文件 
p=0; 
for(i=0; i<c->height; i++) 
{ 
memcpy(DisplayBuf+p,picture->data[0] + i * picture->linesize[0], c->width); 
p+=c->width; 
} 
for(i=0; i<c->height/2; i++) 
{ 
memcpy(DisplayBuf+p,picture->data[1] + i * picture->linesize[1], c->width/2); 
p+=c->width/2; 
} 
for(i=0; i<c->height/2; i++) 
{ 
memcpy(DisplayBuf+p,picture->data[2] + i * picture->linesize[2], c->width/2); 
p+=c->width/2; 
} 
//显示画面 
DisplayVideo(DisplayBuf); 
} 
} 
 
//7.关闭输入文件 
if(inpf) 
fclose(inpf); 
 
Decodereturn: 
 
//8.关闭解码器,释放解码器内存 
if(c) { 
avcodec_close(c); 
av_free(c); 
c = NULL; 
} 
//9.释放解码画面内存 
if(picture) { 
av_free(picture); 
picture = NULL; 
} 
 
//10.释放解码文件缓冲 
if(Buf) 
{ 
free(Buf); 
Buf = NULL; 
} 
 
free(DisplayBuf); 
}