// 固定文件路径
    const char *src_filename = "F:\\迅雷下载\\lost.mkv";
    const char *video_dst_filename = "lost_video.yuv";
    const char *audio_dst_filename = "lost_audio.pcm";
Play the output video file with the command:
ffplay -f rawvideo -pix_fmt yuv420p -video_size 1280x720 lost_video.yuv
Warning: the sample format the decoder produced is planar (fltp). This example will output the first channel only.
Play the output audio file with the command:
ffplay -f f32le -ac 1 -ar 44100 lost_audio.pcm