[FFMPEG] 동영상 파일 기본 정보 읽기

그냥 간단하게 동영상에서 정보를 읽어 보자.

 

사용한 ffmpeg library는 지난번에 빌드한 것을 사용한다.

 

2023.01.07 - [놀기/잡스러운 것] - ffmpeg build (Windows 기반, win32 버전)

ffmpeg build (Windows 기반, win32 버전)

 

Project 파일에 경로를 추가하고

QT -= gui

FFMPEG_DEV_PATH = "E:/busyman/Lib/ffmpeg_dev"

CONFIG += c++17 console
CONFIG -= app_bundle

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
        main.cpp

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

INCLUDEPATH += $$FFMPEG_DEV_PATH/include
LIBS += -L$$FFMPEG_DEV_PATH/lib

 

아래와 같이 예제를 작성한다.

#include <QCoreApplication>
#include <QTimer>
#include <QDebug>

extern "C" {
    #include "libavutil/adler32.h"
    #include "libavcodec/avcodec.h"
    #include "libavformat/avformat.h"
    #include "libavutil/imgutils.h"
}

#pragma comment(lib, "Secur32.lib")
#pragma comment(lib, "ws2_32.lib")
#pragma comment(lib, "bcrypt.lib")
#pragma comment(lib, "Mfplat.lib")
#pragma comment(lib, "Mfuuid.lib")
#pragma comment(lib, "Strmiids.lib")
#pragma comment(lib, "ole32.lib")

#pragma comment(lib, "User32.lib")

#pragma comment(lib, "libavcodec.a")
#pragma comment(lib, "libavdevice.a")
#pragma comment(lib, "libavfilter.a")
#pragma comment(lib, "libavformat.a")
#pragma comment(lib, "libavutil.a")
#pragma comment(lib, "libpostproc.a")
#pragma comment(lib, "libswresample.a")
#pragma comment(lib, "libswscale.a")

int run_main(void)
{
    int sec = 0;
    int result;
    int video_stream;
    const AVCodec* codec = NULL;
    AVFormatContext* fmt_ctx = NULL;
    AVCodecParameters* origin_par = NULL;

    QString input_filename = QString("E:/_001/test.mkv");
    result = avformat_open_input(&fmt_ctx, input_filename.toLocal8Bit().constData(), NULL, NULL);
    if (result < 0) {
        av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
        return result;
    }

    result = avformat_find_stream_info(fmt_ctx, NULL);
    if (result < 0) {
        av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");
        goto end;
    }

    video_stream = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
    if (video_stream < 0) {
        av_log(NULL, AV_LOG_ERROR, "Can't find video stream in input file\n");
        result = video_stream;
        goto end;
    }

    origin_par = fmt_ctx->streams[video_stream]->codecpar;
    codec = avcodec_find_decoder(origin_par->codec_id);
    if (!codec) {
        av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
        result = AVERROR_DECODER_NOT_FOUND;
        goto end;
    }

    av_log(NULL, AV_LOG_INFO, "input formate = %s\n", fmt_ctx->iformat->name);
    av_log(NULL, AV_LOG_INFO, "video codec name = %s\n", codec->name);
    av_log(NULL, AV_LOG_INFO, "bit_rate = %dKbps\n", (int) (fmt_ctx->bit_rate/1024));
    sec = fmt_ctx->duration/(1000000);
    av_log(NULL, AV_LOG_INFO, "duration = %02d:%02d:%02d.%03d\n", (int) (sec/3600), (int) ((sec%3600)/60), (int) ((sec%3600)%60), (int) ((fmt_ctx->duration/1000)%1000));

end:
    avformat_close_input(&fmt_ctx);

    return result;
}

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QTimer::singleShot(0,[](){
         run_main();
         QCoreApplication::exit(0);
    });

    return a.exec();
}

 

실행 결과는 아래와 같다.

input formate = matroska,webm
video codec name = h264
bit_rate = 0Kbps
duration = 01:07:03.040