我正在尝试使用gcc执行tutorial01.c并且我在同一个文件夹中有gcc和tutorial01.c以及libavcodec和libavformat及其相关文件它给了我这个错误
致命错误:libavcodec / avcodec.h没有这样的文件或目录编译终止
当我通过ubuntu 12.04中的终端运行gcc -o tutorial01 tutorial01.c -lavformat -lavcodec -lz
时
代码是
#include libavcodec/avcodec.h
#include libavformat/avformat.h
#include stdio.h
void SaveFrame(AVFrame *pFrame, int width, int height, int iFrame)
{
FILE *pFile;
char szFilename[32];
int y;
// Open file
sprintf(szFilename, "frame%d.ppm", iFrame);
pFile=fopen(szFilename, "wb");
if(pFile==NULL)
return;
// Write header
fprintf(pFile, "P6\n%d %d\n255\n", width, height);
// Write pixel data
for(y=0; y<height; y++)
fwrite(pFrame->data[0]+y*pFrame->linesize[0], 1, width*3, pFile);
// Close file
fclose(pFile);
}
int main(int argc, char *argv[])
{
AVFormatContext *pFormatCtx;
int i, videoStream;
AVCodecContext *pCodecCtx;
AVCodec *pCodec;
AVFrame *pFrame;
AVFrame *pFrameRGB;
AVPacket packet;
int frameFinished;
int numBytes;
uint8_t *buffer;
if(argc < 2)
{
printf("Please provide a movie file\n");
return -1;
}
// Register all formats and codecs
av_register_all();
// Open video file
if(av_open_input_file(&pFormatCtx, argv[1], NULL, 0, NULL)!=0)
return -1; // Couldn't open file
// Retrieve stream information
if(av_find_stream_info(pFormatCtx)<0)
return -1; // Couldn't find stream information
// Dump information about file onto standard error
dump_format(pFormatCtx, 0, argv[1], 0);
// Find the first video stream
videoStream=-1;
for(i=0; i<pFormatCtx->nb_streams; i++)
if(pFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_VIDEO)
{
videoStream=i;
break;
}
if(videoStream==-1)
return -1; // Didn't find a video stream
// Get a pointer to the codec context for the video stream
pCodecCtx=pFormatCtx->streams[videoStream]->codec;
// Find the decoder for the video stream
pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
if(pCodec==NULL)
{
fprintf(stderr, "Unsupported codec!\n");
return -1; // Codec not found
}
// Open codec
if(avcodec_open(pCodecCtx, pCodec)<0)
return -1; // Could not open codec
// Allocate video frame
pFrame=avcodec_alloc_frame();
// Allocate an AVFrame structure
pFrameRGB=avcodec_alloc_frame();
if(pFrameRGB==NULL)
return -1;
// Determine required buffer size and allocate buffer
numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width,
pCodecCtx->height);
buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
// Assign appropriate parts of buffer to image planes in pFrameRGB
// Note that pFrameRGB is an AVFrame, but AVFrame is a superset
// of AVPicture
avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24,
pCodecCtx->width, pCodecCtx->height);
// Read frames and save first five frames to disk
i=0;
while(av_read_frame(pFormatCtx, &packet)>=0)
{
// Is this a packet from the video stream?
if(packet.stream_index==videoStream)
{
// Decode video frame
avcodec_decode_video(pCodecCtx, pFrame, &frameFinished,
packet.data, packet.size);
// Did we get a video frame?
if(frameFinished)
{
// Convert the image from its native format to RGB
img_convert((AVPicture *)pFrameRGB, PIX_FMT_RGB24,
(AVPicture*)pFrame, pCodecCtx->pix_fmt, pCodecCtx->width,
pCodecCtx->height);
// Save the frame to disk
if(++i<=5)
SaveFrame(pFrameRGB, pCodecCtx->width, pCodecCtx->height,
i);
}
}
// Free the packet that was allocated by av_read_frame
av_free_packet(&packet);
}
// Free the RGB image
av_free(buffer);
av_free(pFrameRGB);
// Free the YUV frame
av_free(pFrame);
// Close the codec
avcodec_close(pCodecCtx);
// Close the video file
av_close_input_file(pFormatCtx);
return 0;
}
答案 0 :(得分:2)
由于路径错误而发生错误
-L /家/ yourpath / ffmpeg_build / LIB /
-I /家/ yourpath / ffmpeg_build /包含/
ffmpeg_build - 将构建文件和安装库的位置。
示例:
创建文件“execute.sh”
现在打开文件并粘贴以下代码:
g++ -Wno-format-zero-length -Wno-write-strings -L/home/yourpath/ffmpeg_build/lib/ -I/home/yourpath/ffmpeg_build/include/ -o output program.cpp -lavcodec -lavformat -lavutil -lavdevice -lswresample -lswscale -lm -lva -lpthread -lvorbis -lvpx -lopus -lz -lpostproc -ldl -lfdk-aac -lmp3lame -lvorbisenc -lvorbisfile -lx264 -ltheora -ltheoraenc -ltheoradec -ldl -lrt -lx265 -lbz2
并输入:sh execute.sh和binary将在名称“output”中创建 然后输入./output输出。
注意:上面是C ++,c代码将g ++改为gcc
答案 1 :(得分:1)
您需要将libavcodec和libavformat包含文件的路径添加到命令行。找到include /目录并添加
-Ipath/to/include
每个相关的包含文件。
您还需要使用-L。
对库目录执行相同的操作答案 2 :(得分:0)
这取决于您如何安装ffmpeg。 通常,您可以通过3个步骤进行编译和安装:
如果没有配置“ --prefix”参数,它将安装在默认路径上。(在我的Ubuntu上,我发现ffmpeg已安装在“ / usr / local /”下)
正确安装ffmpeg后,您可以使用以下命令来编译代码:
gcc testFfmpeg.c -I/yourpath/ffmpeg/include/ -L/yourpath/ffmpeg/lib/
或
gcc testFfmpeg.c -I/usr/local/include/ -L/usr/local/lib/