FFmpeg obtains video information of media files

Video packet flag

code

printf("index:%d\n", in_stream->index);

result

index:0

Video frame rate

// avg_frame_rate: 视频帧率,单位为fps，表示每秒出现多少帧
printf("fps:%lffps\n", av_q2d(in_stream->avg_frame_rate));

result

fps:29.970070fps

video codec

code

if (AV_CODEC_ID_MPEG4 == in_stream->codecpar->codec_id) //视频压缩编码格式
{
    
    
    printf("video codec:MPEG4\n");
}
else if (AV_CODEC_ID_H264 == in_stream->codecpar->codec_id) //视频压缩编码格式
{
    
    
    printf("video codec:H264\n");
}
else
{
    
    
    printf("video codec_id:%d\n", in_stream->codecpar->codec_id);
}

result

video codec:H264

Video frame width and height

code

// 视频帧宽度和帧高度
printf("width:%d height:%d\n", in_stream->codecpar->width,
in_stream->codecpar->height);

result

width:852 height:480

Video length

code

//视频总时长，单位为秒。注意如果把单位放大为毫秒或者微妙，音频总时长跟视频总时长不一定相等的
if(in_stream->duration != AV_NOPTS_VALUE)
{
    
    
    int duration_video = (in_stream->duration) * av_q2d(in_stream->time_base);
    printf("video duration: %02d:%02d:%02d\n",
           duration_video / 3600,
           (duration_video % 3600) / 60,
           (duration_video % 60)); //将视频总时长转换为时分秒的格式打印到控制台上
}
else
{
    
    
    printf("video duration unknown\n");
}

result

video duration: 00:05:17

Complete code

for (uint32_t i = 0; i < ifmt_ctx->nb_streams; i++)
{
    
    
    AVStream *in_stream = ifmt_ctx->streams[i];// 音频流、视频流、字幕流
    //如果是音频流，则打印音频的信息
    if (AVMEDIA_TYPE_AUDIO == in_stream->codecpar->codec_type)
    {
    
    ...}
    else if (AVMEDIA_TYPE_VIDEO == in_stream->codecpar->codec_type)  //如果是视频流，则打印视频的信息
    {
    
    
        printf("----- Video info:\n");
        printf("index:%d\n", in_stream->index);
        // avg_frame_rate: 视频帧率,单位为fps，表示每秒出现多少帧
        printf("fps:%lffps\n", av_q2d(in_stream->avg_frame_rate));
        if (AV_CODEC_ID_MPEG4 == in_stream->codecpar->codec_id) //视频压缩编码格式
        {
    
    
            printf("video codec:MPEG4\n");
        }
        else if (AV_CODEC_ID_H264 == in_stream->codecpar->codec_id) //视频压缩编码格式
        {
    
    
            printf("video codec:H264\n");
        }
        else
        {
    
    
            printf("video codec_id:%d\n", in_stream->codecpar->codec_id);
        }
        // 视频帧宽度和帧高度
        printf("width:%d height:%d\n", in_stream->codecpar->width,
               in_stream->codecpar->height);
        //视频总时长，单位为秒。注意如果把单位放大为毫秒或者微妙，音频总时长跟视频总时长不一定相等的
        if(in_stream->duration != AV_NOPTS_VALUE)
        {
    
    
            int duration_video = (in_stream->duration) * av_q2d(in_stream->time_base);
            printf("video duration: %02d:%02d:%02d\n",
                   duration_video / 3600,
                   (duration_video % 3600) / 60,
                   (duration_video % 60)); //将视频总时长转换为时分秒的格式打印到控制台上
        }
        else
        {
    
    
            printf("video duration unknown");
        }

        printf("\n");
        videoindex = i;
    }
}

result

----- Video info:
index:0
fps:29.970070fps
video codec:H264
width:852 height:480
video duration: 00:05:17