libavcodec ve libavformat ile video bilgilerini öğrenmek

libavcodec,libavformat Â free software/open source LGPL-lisanslı ffmpeg tarafından kullanılan codec çözme / işleme kütüphanesidir.

Ubuntu – Debian altında örnek kodu derleyebilmek için gerekli paketler :

$ sudo apt-get install libavcodec-dev libavformat-dev

Derlemek için :

g++ avf.cpp -I/usr/include/libavcodec -I/usr/include/libavformat -lavformat -lavcodec -L/usr/lib/libavformat.so -L/usr/lib/libavcodec.so -o avf

Örnek Kullanım :

./avf test.mp4

Ã‡ıktı :

Video codec Â Â Â : mp42

Width Â Â Â Â : 1920

Height Â Â Â Â : 1080

DurationÂ Â Â : 300

Audio codec Â Â : aac

Audio channels Â Â : 2

Audio samplerate Â : 44100

Audio bitrate Â Â : 128

#ifndef INT64_C
#define INT64_C(c) (c ## LL)
#define UINT64_C(c) (c ## ULL)
#endif

extern "C" {
#include &lt;avcodec.h&gt;
#include &lt;avformat.h&gt;
}

#include &lt;stdio.h&gt;
#include &lt;stdlib.h&gt;
#include &lt;iostream&gt;

//g++ avf.cpp -I/usr/include/libavcodec -I/usr/include/libavformat -lavformat -lavcodec -L/usr/lib/libavformat.so -L/usr/lib/libavcodec.so -o avf

using namespace std;

int main(int argc, char *argv[])
{
	av_log_set_level(0);
	av_register_all();
	AVFormatContext *pFormatCtx;
	const char      *filename=argv[1];

	// Open video file
	if(av_open_input_file(&amp;pFormatCtx, filename, NULL, 0, NULL)!=0)
	{
	   cout &lt; &lt; "can't open file" &lt;&lt; endl;
	   exit(-1);
	}	

	// Retrieve stream information
	if(av_find_stream_info(pFormatCtx)&lt;0)
	{
	  cout &lt;&lt; "can't get stream info" &lt;&lt; endl; 	  exit(-1); 	} 	//dump_format(pFormatCtx, 0, filename, false); 	int            i, videoStream; 	AVCodecContext *pCodecCtx; //http://ffmpeg.org/doxygen/0.6/structAVCodecContext.html 	AVCodecContext *pCodecCtx2; 	 	pCodecCtx=pFormatCtx-&gt;streams[0]-&gt;codec;
	pCodecCtx2=pFormatCtx-&gt;streams[1]-&gt;codec;

	AVCodec* vCodec;//http://ffmpeg.org/doxygen/0.6/structAVCodec.html
	AVCodec* aCodec;
	vCodec=avcodec_find_decoder(pCodecCtx-&gt;codec_id);
	aCodec=avcodec_find_decoder(pCodecCtx2-&gt;codec_id);

	cout &lt; &lt; "Video codec       : " &lt;&lt; vCodec-&gt;name &lt; &lt; endl;
	cout &lt;&lt; "Width    	  : " &lt;&lt; pCodecCtx-&gt;width &lt; &lt; endl;
	cout &lt;&lt; "Height   	  : " &lt;&lt; pCodecCtx-&gt;height &lt; &lt; endl;
	cout &lt;&lt; "Duration 	  : " &lt;&lt; pFormatCtx-&gt;duration &lt; &lt; endl;
	//cout &lt;&lt; "codec id	  : " &lt;&lt; (int)pCodecCtx2 &lt;&lt; endl;
	cout &lt;&lt; "Audio codec	  : " &lt;&lt; aCodec-&gt;name &lt; &lt; endl;
	cout &lt;&lt; "Audio channels    : " &lt;&lt; pCodecCtx2-&gt;channels &lt; &lt; endl;
	cout &lt;&lt; "Audio samplerate  : " &lt;&lt;  pCodecCtx2-&gt;sample_rate &lt; &lt; endl;
	cout &lt;&lt; "Audio bitrate     : " &lt;&lt;  pCodecCtx2-&gt;bit_rate &lt; &lt; endl;

	avcodec_close(pCodecCtx);
	avcodec_close(pCodecCtx2);

	av_close_input_file(pFormatCtx);
	return 0;
}

#ifndef INT64_C

#define INT64_C(c) (c ## LL)

#define UINT64_C(c) (c ## ULL)

#endif

extern "C" {

#include <avcodec.h>

#include <avformat.h>

}

#include <stdio.h>

#include <stdlib.h>

#include <iostream>

//g++ avf.cpp -I/usr/include/libavcodec -I/usr/include/libavformat -lavformat -lavcodec -L/usr/lib/libavformat.so -L/usr/lib/libavcodec.so -o avf

using namespace std;

int main(int argc, char *argv[])

{

av_log_set_level(0);

av_register_all();

AVFormatContext *pFormatCtx;

const char *filename=argv[1];

// Open video file

if(av_open_input_file(&pFormatCtx, filename, NULL, 0, NULL)!=0)

{

cout < < "can't open file" << endl;

exit(-1);

}

// Retrieve stream information

if(av_find_stream_info(pFormatCtx)<0)

{

cout << "can't get stream info" << endl; exit(-1); } //dump_format(pFormatCtx, 0, filename, false); int i, videoStream; AVCodecContext *pCodecCtx; //http://ffmpeg.org/doxygen/0.6/structAVCodecContext.html AVCodecContext *pCodecCtx2; pCodecCtx=pFormatCtx->streams[0]->codec;

pCodecCtx2=pFormatCtx->streams[1]->codec;

AVCodec* vCodec;//http://ffmpeg.org/doxygen/0.6/structAVCodec.html

AVCodec* aCodec;

vCodec=avcodec_find_decoder(pCodecCtx->codec_id);

aCodec=avcodec_find_decoder(pCodecCtx2->codec_id);

cout < < "Video codec : " << vCodec->name < < endl;

cout << "Width : " << pCodecCtx->width < < endl;

cout << "Height : " << pCodecCtx->height < < endl;

cout << "Duration : " << pFormatCtx->duration < < endl;

//cout << "codec id : " << (int)pCodecCtx2 << endl;

cout << "Audio codec : " << aCodec->name < < endl;

cout << "Audio channels : " << pCodecCtx2->channels < < endl;

cout << "Audio samplerate : " << pCodecCtx2->sample_rate < < endl;

cout << "Audio bitrate : " << pCodecCtx2->bit_rate < < endl;

avcodec_close(pCodecCtx);

avcodec_close(pCodecCtx2);

av_close_input_file(pFormatCtx);

return 0;

}

Örnek kod

Yayınlandı

Mayıs 24, 2011

Xcoder -- C/C++, Programlama | Mayıs 24, 2011

libavcodec ve libavformat ile video bilgilerini öğrenmek

Yayınlandı

Mayıs 24, 2011

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