// create media reader by file
using(MediaReader reader = new MediaReader("input.mp4"))
{
    // get packet from reader (demultiplexing to packet)
    foreach(var packet in reader.ReadPacket())
    {
        // get frame from different stream (decode to frame).
        foreach (var frame in reader[packet.StreamIndex].ReadFrame(packet))
        {
            IntPtr[] data = frame.Data; // FFmpeg AVFrame.data
	    byte[][] managed = frame.GetData(); // copy AVFrame.data to managed data
	    if(frame is VideoFrame)
	        Bitmap bitmap = frame.ToBitmap(); // add EmguFFmpeg.Bitmap, only for video frame
	    Mat mat = frame.ToMat(); // add EmguFFmpeg.OpenCvSharp or EmguFFmpeg.EmguCV (video and audio)
        }
    }
}

/* create a 60s duration video */

int height = 600;
int width = 800;
int fps = 30;
int duration = 60;

// create media writer
using(MediaWriter writer = new MediaWriter("output.mp4"))
{
    // create media encoder
    MediaEncode videoEncode = MediaEncode.CreateVideoEncode(writer.Format.VideoCodec, writer.Format.Flags, width, height, fps);
    // add stream by encoder
    writer.AddStream(videoEncode);
    // init writer
    writer.Initialize();
    // create video frame, default video frame is green image 
    VideoFrame videoFrame = new VideoFrame(AVPixelFormat.AV_PIX_FMT_YUV420P, width, height);

    // write frame by timespan see EmguFFmpeg.Example/Mp4VideoWriter.cs#L95
    // write 60s duration video
    long lastpts = -1;
    Stopwatch timer = Stopwatch.StartNew();
    for(stopwatch.Elapsed <= TimeSpan.FromSeconds(duration)) 
    {
        long curpts = (long)(timeSpan.TotalSeconds * fps);
        if(curpts > lastpts)
        {
            lastpts = curpts;
            
            /* fill video frame data, see more code in example*/
            
            videoFrame.PTS = curpts;
            // write frame, encode to packet and write to writer
            foreach (var packet in writer.First().WriteFrame(videoFrame))
            {
                writer.WritePacket(packet);
            }
        }
    }

    // flush encode cache
    writer.FlushMuxer();
}