/// <summary>
/// dotnet SnapshotForZR04RN.dll ipaddr 5000 admin passwd 0 | ffmpeg -i - -vframes 1 -f image2pipe -vcodec mjpeg -q 3 - > snapshot.jpg
/// </summary>
/// <param name="args"></param>
/// <returns></returns>
static async Task Main(string[] args)
{
int channel = args.Length > 4 ? int.Parse(args[4]) : 0;
int sub = args.Length > 5 ? int.Parse(args[5]) : 0;
connection = new DeviceConnection();
await connection.Connect(args[0], int.Parse(args[1]));
LoginSuccess loginSuccess = await connection.Login(args[2], args[3]);
StreamFrame keyframe = await connection.SnapKeyframe(channel, sub);
Stream stdout = Console.OpenStandardOutput();
await stdout.WriteAsync(keyframe.Data, 0, keyframe.Data.Length);
connection.Disconnect();
await stdout.FlushAsync();
stdout.Close();
}