FifostreamExample.cs

   private static void TestFifo(Stream cStream)
        {
            int readbytes;
            int crbytes;

            var buf = new byte[10 * 1024 * 1024];
            var cBuf = new byte[255 * 1024];

            var sInfo = new FileInfo(@"D:\Work\Video Editing\Raw\Overwatch\Overwatch 10.17.2017 - 23.59.39.01.mp4");
            var dInfo = new FileInfo(@"D:\Work\Video Editing\Raw\dst.mp4");

            if (dInfo.Exists) dInfo.Delete();

            var sw = new Stopwatch();

            using (var ss = sInfo.OpenRead())
            using (var ds = dInfo.OpenWrite())
            using (var cs = new FifoStream())
            {
                sw.Start();
                while ((readbytes = ss.Read(buf, 0, buf.Length)) != 0)
                {
                    cs.Write(buf, 0, readbytes);
                    while ((crbytes = cs.Read(cBuf, 0, cBuf.Length)) != 0)
                    {
                        ds.Write(cBuf, 0, crbytes);
                    }
                }
                sw.Stop();
            }

            var sHash = sInfo.ToHashBytes<SHA256>();
            var dHash = dInfo.ToHashBytes<SHA256>();
            Console.WriteLine($"File equality: {sHash.SequenceEqual(dHash)} / {sw.Elapsed.TotalMilliseconds} ms");
        }