Read Stdin continously

Question

I have a C# program which takes FFMPEG raw data and begins streaming it to a monitor connected to the network. The program works with still images so I assume I have something wrong with my stdin reading speed. I want the program to work like this:

1. Begin reading stdin ffmpeg raw
2. When the buffer is at a specified length (I have to form the frames myself from the raw data, this specified length is width * height * 3)
3. Send frame & meantime start reading the next part of the raw data

Repeat until shutdown / video end. My current code can stream with 30 FPS, but its not quite good. I could achieve 60 FPS when sending still images. The timers are needed because I have to send the frames at very specific timestamps.

int width = 128;
int height = 64;
static Stream standard_input = Console.OpenStandardInput();
static byte[] buffer_one = new byte[width*height*3];

        public static void ReadStandardInput(){
            int in_len;
            while((in_len = standard_input.Read(buffer, 0, height*width*3)) > 0 ){
                if (in_len == height*width*3){
                    if (frame_delay_clock.IsRunning == false){
                        frame_delay_clock.Start();
                    }
                    if (frame_delay_clock.ElapsedMilliseconds >= wait_between_frames){
                        SendFrame(buffer, 15);
                        frame_delay_clock.Reset();
                    }
                    else{
                        continue;
                    }
                }
                else{
                    continue;
                }
                }
                System.Console.WriteLine("STDIN ended.");
                standard_input.Close();
            }