Opusdec unable to decode from stdin to stdout

[XTankKiller]

I'm trying to encode and decode opus data using opusdec in c#.
`using NAudio.Wave;
using System.Diagnostics;

List<byte[]> samples = new List<byte[]>();
WaveInEvent waveIn = new WaveInEvent();
WaveOutEvent waveOut = new WaveOutEvent();
waveIn.WaveFormat = WaveFormat.CreateIeeeFloatWaveFormat(48000, 2);
waveIn.BufferMilliseconds = 50;
var writer = new WaveFileWriter("output.wav", waveIn.WaveFormat);
waveIn.DataAvailable += (sender, e) =>
{
using (MemoryStream m4 = new MemoryStream())
using (var reader = new RawSourceWaveStream(new MemoryStream(e.Buffer, 0, e.BytesRecorded), waveIn.WaveFormat))
//using (var conversionStream = new WaveFormatConversionProvider(waveIn.WaveFormat, reader))
{
writer.Write(e.Buffer, 0, e.BytesRecorded);
WaveFileWriter.WriteWavFileToStream(m4, reader);
m4.Seek(0, SeekOrigin.Begin);
ProcessStartInfo startInfo = new ProcessStartInfo
{
FileName = "opusenc.exe",
Arguments = "--quiet --speech --bitrate 160 - -",
RedirectStandardInput = true,
RedirectStandardOutput = true,
UseShellExecute = false
};
MemoryStream opusBytes = new MemoryStream();
using (Process process = Process.Start(startInfo))
{
process.StandardInput.BaseStream.Write(m4.ToArray());
process.StandardInput.Flush();
byte[] buffer = new byte[1024];
int bytes = 0;
while ((bytes = process.StandardOutput.BaseStream.Read(buffer, 0, buffer.Length)) > 0)
{
opusBytes.Write(buffer, 0, bytes);
}
}
Console.WriteLine(m4.Length);
Console.WriteLine(opusBytes.Length);
samples.Add(opusBytes.ToArray());
}
Console.WriteLine("Recording");
};
waveIn.StartRecording();
Console.ReadLine();
waveIn.StopRecording();
Thread.Sleep(1000);
writer.Close();
foreach(var sample in samples)
{
//File.WriteAllBytes("temp.opus", sample);
MemoryStream wavBytes = new MemoryStream();
ProcessStartInfo startInfo = new ProcessStartInfo
{
FileName = "opusdec.exe",
Arguments = "- -",
RedirectStandardInput = true, // Rediriger l'entrée standard
RedirectStandardOutput = true,
UseShellExecute = false
};
using (Process process = Process.Start(startInfo))
{
process.StandardInput.BaseStream.Write(sample);
process.StandardInput.Close();
byte[] buffer = new byte[1024];
int bytes = 0;
while ((bytes = process.StandardOutput.BaseStream.Read(buffer, 0, buffer.Length)) > 0)
{
wavBytes.Write(buffer, 0, bytes);
}
}
wavBytes.Position = 0;
waveOut.Init(new RawSourceWaveStream(wavBytes, new WaveFormat(48000,16,2)));
waveOut.Play();
//Console.ReadLine();
while(waveOut.PlaybackState == PlaybackState.Playing)
{ }
}`

but opusdec throws
Failed to open '-'.

If i unquote //File.WriteAllBytes("temp.opus", sample); and try to decode the file using cmd and opusdec it works fine.
If i replace Arguments = "- -", by Arguments = "temp.opus -", it works fine.
If i type
ProcessStartInfo startInfo = new ProcessStartInfo { FileName = "opusdec.exe", Arguments = "- test.wav", RedirectStandardInput = true, // Rediriger l'entrée standard RedirectStandardOutput = true, UseShellExecute = false }; using (Process process = Process.Start(startInfo)) { process.StandardInput.BaseStream.Write(File.ReadAllBytes("temp.opus")); process.StandardInput.Close(); byte[] buffer = new byte[1024]; int bytes = 0; while ((bytes = process.StandardOutput.BaseStream.Read(buffer, 0, buffer.Length)) > 0) { wavBytes.Write(buffer, 0, bytes); } } it also works fine.
All of this leads me to thing there is an issue when using stdin and stdout with opusdec.exe