Speechmatics 1.1.2

dotnet add package Speechmatics --version 1.1.2
NuGet\Install-Package Speechmatics -Version 1.1.2
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="Speechmatics" Version="1.1.2" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Speechmatics --version 1.1.2
#r "nuget: Speechmatics, 1.1.2"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install Speechmatics as a Cake Addin
#addin nuget:?package=Speechmatics&version=1.1.2

// Install Speechmatics as a Cake Tool
#tool nuget:?package=Speechmatics&version=1.1.2


C# client for Speechmatics real time API


Install-Package Speechmatics

Sample code

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Text;
using Speechmatics.Realtime.Client;
using Newtonsoft.Json;
using Speechmatics.Realtime.Client.Config;

namespace DemoApp
    public class Program
        private const string SampleAudio = "2013-8-british-soccer-football-commentary-alex-warner.mp3";

        private static string ToJson(object obj)
            return JsonConvert.SerializeObject(obj);

        private static string RtUrl
                return "wss://staging.realtimeappliance.speechmatics.io:9000/v2";
                var host = Environment.GetEnvironmentVariable("TEST_HOST") ?? "api.rt.speechmatics.io";
                return host.StartsWith("wss://") ? host : $"wss://{host}:9000/";

        public static void Main(string[] args)
            var start = DateTime.Now;
            Debug.WriteLine("Starting at {0}", start);
            var builder = new StringBuilder();
            var language = Environment.GetEnvironmentVariable("LANG") ?? "en";

            using (var stream = File.Open(SampleAudio, FileMode.Open, FileAccess.Read))

                    var config = new SmRtApiConfig(language)
                        AuthToken= Environment.GetEnvironmentVariable("AUTH_TOKEN"),
                        // GenerateTempToken = True <- set this to True for accounts from portal.speechmatics.com
                        OutputLocale = "en-GB",
                        AddTranscriptCallback = s => builder.Append(s),
                        AddTranscriptMessageCallback = s => Console.WriteLine(ToJson(s)),
                        AddTranslationMessageCallback = s => Console.WriteLine(ToJson(s)),
                        AddPartialTranscriptMessageCallback = s => Console.WriteLine(ToJson(s)),
                        ErrorMessageCallback = s => Console.WriteLine(ToJson(s)),
                        WarningMessageCallback = s => Console.WriteLine(ToJson(s)),
                        CustomDictionaryPlainWords = new[] {"speechmagic"},
                        CustomDictionarySoundsLikes = new Dictionary<string, IEnumerable<string>>(),
                        Insecure = true,
                        TranslationConfig = new TranslationConfig() {
                            TargetLanguages = new [] {"de"},
                            EnablePartials = true

                    // We can do this here, or earlier. It's not used until .Run() is called on the API object.
                    config.CustomDictionarySoundsLikes["gnocchi"] = new[] {"nokey", "noki"};

                    var api = new SmRtApi(RtUrl,
                    // Run() will block until the transcription is complete.
                    Console.WriteLine($"Connecting to {RtUrl}");
                catch (AggregateException e)

            var finish = DateTime.Now;
            Debug.WriteLine("Starting at {0} -- {1}", finish, finish-start);

Sample Dockerfile

FROM microsoft/dotnet as build-env

RUN git clone https://github.com/jrg1381/smrtapi.net.git
WORKDIR /app/smrtapi.net/SmRtAPI/DemoAppNetCore
RUN sed -i 's/<SignAssembly>true<\/SignAssembly>/<SignAssembly>false<\/SignAssembly>/' ../SmRtAPI/SpeechmaticsAPI.csproj
RUN dotnet build && dotnet publish -c Release -o out
RUN cp ../DemoApp/*.mp3 ./out

FROM microsoft/dotnet:runtime
COPY --from=build-env /app/smrtapi.net/SmRtAPI/DemoAppNetCore/out ./
ENTRYPOINT ["dotnet", "DemoAppNetCore.dll"]


Merge the following with your app.config file to enable debugging to a file. If you don't have an app.config file, use this XML as-is. This technique will work whether you're building from source or using the Nuget package.

<?xml version="1.0" encoding="utf-8"?>
      <source name="System.Net" tracemode="includehex" maxdatasize="1024">
          <add name="System.Net"/>
      <source name="System.Net.Cache">
          <add name="System.Net"/>
      <source name="System.Net.Http">
          <add name="System.Net"/>
      <source name="System.Net.Sockets">
          <add name="System.Net"/>
      <source name="System.Net.WebSockets">
          <add name="System.Net"/>
      <add name="System.Net" value="Verbose"/>
      <add name="System.Net.Cache" value="Verbose"/>
      <add name="System.Net.Http" value="Verbose"/>
      <add name="System.Net.Sockets" value="Verbose"/>
      <add name="System.Net.WebSockets" value="Verbose"/>
      <add name="System.Net"
    <trace autoflush="true">
        <add name="file" type="System.Diagnostics.TextWriterTraceListener" initializeData="trace.log"/>

This will log smrtapi specific information to trace.log (and the output window in Visual Studio, if you're running under a debugger) and all network traffic to network.log.

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net46 is compatible.  net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

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Version Downloads Last updated
1.1.2 196 12/1/2023
1.1.1 241 9/7/2023
1.1.0 156 9/6/2023
1.0.1 201 7/5/2023
1.0.0 1,551 4/25/2016