Update 2.1.1 - See changelog.txt for details

Author: FoggyBytes

README.md

@@ -14,7 +14,12 @@ StreamLight is a fork of [Moonlight](https://github.com/moonlight-stream/moonlig
 
 StreamLight is currently available for **Windows only**.
 
-## ✨ What's New in Version 2.1.0 — "The Telemetry Update" (27/03/2026)
+## ✨ What's New in Version 2.1.1 — "The Jitter Update" (28/03/2026)
+
+### 🔧 Improvements
+* **Jitter in session telemetry** — RTT variance (jitter) is now sampled from `LiGetEstimatedRttInfo` and included in every SESSIONDATA batch; StreamTweak stores `jitter_avg` and `jitter_max` per sample alongside the existing RTT metrics
+
+### Previously in 2.1.0 — "The Telemetry Update"
 
 ### 🚀 New Features
 * **Session telemetry reporting** — StreamLight streams real-time client-side metrics to StreamTweak during active sessions: FPS, frame drops, RTT, decode latency, and bitrate are sampled every second and transmitted in periodic batches; StreamTweak uses this data to generate a session quality report visible in the Logs tab (requires StreamTweak 5.2.0 or later on the host PC)

StreamLight.iss

@@ -1,9 +1,9 @@
 ; =====================================================
-; StreamLight v2.1.0 - Installer
+; StreamLight v2.1.1 - Installer
 ; A Moonlight fork with StreamTweak integration
 ; =====================================================
 #define AppName "StreamLight"
-#define AppVersion "2.1.0"
+#define AppVersion "2.1.1"
 #define AppPublisher "FoggyBytes"
 #define AppURL "https://github.com/FoggyBytes/StreamLight"
 #define AppExeName "StreamLight.exe"

app/SessionTelemetrySampler.cpp

@@ -58,12 +58,15 @@ void SessionTelemetrySampler::onSampleTimer()
     s.drops       = ws.drops;
     s.rttAvg      = (float)ws.rttAvgMs;
     s.rttMax      = s.rttAvg;       // will be refined across batch as running max
+    s.jitterAvg   = (float)ws.jitterMs;
+    s.jitterMax   = s.jitterAvg;    // will be refined across batch as running max
     s.decodeMs    = ws.decodeAvgMs;
     s.bitrateMbps = ws.bitrateMbps;
 
     // Track running min/max within the current batch
-    if (s.fpsAvg < m_BatchFpsMin) m_BatchFpsMin = s.fpsAvg;
-    if (s.rttAvg > m_BatchRttMax) m_BatchRttMax = s.rttAvg;
+    if (s.fpsAvg    < m_BatchFpsMin)    m_BatchFpsMin    = s.fpsAvg;
+    if (s.rttAvg    > m_BatchRttMax)    m_BatchRttMax    = s.rttAvg;
+    if (s.jitterAvg > m_BatchJitterMax) m_BatchJitterMax = s.jitterAvg;
 
     m_Samples.append(s);
 }
@@ -82,8 +85,9 @@ void SessionTelemetrySampler::flushAndStop()
 
     // Apply batch-level min/max before the final send
     for (auto& s : m_Samples) {
-        s.fpsMin = m_BatchFpsMin;
-        s.rttMax = m_BatchRttMax;
+        s.fpsMin    = m_BatchFpsMin;
+        s.rttMax    = m_BatchRttMax;
+        s.jitterMax = m_BatchJitterMax;
     }
 
     // Use synchronous send: exec() has returned and the Qt event loop is no
@@ -97,18 +101,20 @@ void SessionTelemetrySampler::sendBatch()
 {
     if (m_Samples.isEmpty()) return;
 
-    // Apply batch-level min/max to each sample's fpsMin and rttMax fields
+    // Apply batch-level min/max to each sample's fpsMin, rttMax, jitterMax fields
     for (auto& s : m_Samples) {
-        s.fpsMin = m_BatchFpsMin;
-        s.rttMax = m_BatchRttMax;
+        s.fpsMin    = m_BatchFpsMin;
+        s.rttMax    = m_BatchRttMax;
+        s.jitterMax = m_BatchJitterMax;
     }
 
     QString json = buildBatchJson();
     m_Bridge.sendSessionData(m_HostAddress, json);
 
     m_Samples.clear();
-    m_BatchFpsMin =  9999.0f;
-    m_BatchRttMax = -1.0f;
+    m_BatchFpsMin    =  9999.0f;
+    m_BatchRttMax    = -1.0f;
+    m_BatchJitterMax = -1.0f;
 }
 
 QString SessionTelemetrySampler::buildBatchJson() const
@@ -121,6 +127,8 @@ QString SessionTelemetrySampler::buildBatchJson() const
         obj[QStringLiteral("drops")]        = s.drops;
         obj[QStringLiteral("rtt_avg")]      = qRound(s.rttAvg * 10) / 10.0;
         obj[QStringLiteral("rtt_max")]      = qRound(s.rttMax * 10) / 10.0;
+        obj[QStringLiteral("jitter_avg")]   = qRound(s.jitterAvg * 10) / 10.0;
+        obj[QStringLiteral("jitter_max")]   = qRound(s.jitterMax * 10) / 10.0;
         obj[QStringLiteral("decode_ms")]    = qRound(s.decodeMs * 10) / 10.0;
         obj[QStringLiteral("bitrate_mbps")] = qRound(s.bitrateMbps * 10) / 10.0;
         samplesArray.append(obj);

app/SessionTelemetrySampler.h

@@ -46,6 +46,8 @@ private slots:
         int   drops;
         float rttAvg;
         float rttMax;
+        float jitterAvg;
+        float jitterMax;
         float decodeMs;
         float bitrateMbps;
     };
@@ -63,6 +65,7 @@ private slots:
     QList<TelemetrySample> m_Samples;
 
     // Running min/max within the current batch (reset each flush)
-    float m_BatchFpsMin =  9999.0f;
-    float m_BatchRttMax = -1.0f;
+    float m_BatchFpsMin    =  9999.0f;
+    float m_BatchRttMax    = -1.0f;
+    float m_BatchJitterMax = -1.0f;
 };

app/streaming/video/ffmpeg.cpp

@@ -2200,8 +2200,10 @@ TelemetryWindowStats FFmpegVideoDecoder::getLastWindowStats() const
     // only called on the dst of addVideoStats, never written into m_ActiveWndVideoStats
     // itself). Read it directly from Limelight at sample time instead.
     uint32_t rtt = 0, rttVariance = 0;
-    if (LiGetEstimatedRttInfo(&rtt, &rttVariance))
-        out.rttAvgMs = (int)rtt;
+    if (LiGetEstimatedRttInfo(&rtt, &rttVariance)) {
+        out.rttAvgMs  = (int)rtt;
+        out.jitterMs  = (int)rttVariance;
+    }
 
     return out;
 }

app/streaming/video/ffmpeg.h

@@ -17,6 +17,7 @@ struct TelemetryWindowStats {
     double  fpsAvg;
     int     drops;
     int     rttAvgMs;
+    int     jitterMs;    // RTT variance from LiGetEstimatedRttInfo
     float   decodeAvgMs;
     float   bitrateMbps;
 };

app/version.txt

@@ -1 +1 @@
-2.1.0
+2.1.1

changelog.txt

@@ -4,6 +4,12 @@ StreamLight - ChangeLog - Developed by FoggyBytes
 
 https://github.com/FoggyBytes/StreamLight
 
+Version 2.1.1 - The "Jitter Update" (28/03/2026)
+------------------------------------------
+
+🔧 IMPROVEMENTS:
+• Session telemetry — jitter reporting: RTT variance (jitter) is now collected from LiGetEstimatedRttInfo and included in every SESSIONDATA batch alongside RTT; StreamTweak stores jitter_avg and jitter_max per sample and can use them in future quality analysis
+
 Version 2.1.0 - The "Telemetry Update" (27/03/2026)
 ------------------------------------------
 

scripts/incremental_build.ps1

@@ -0,0 +1,49 @@
+param([switch]$CopyOnly)
+
+$ErrorActionPreference = 'Stop'
+
+$env:PATH = 'C:\Qt\6.7.3\msvc2022_64\bin;C:\Program Files\7-Zip;' + $env:PATH
+
+$vcvars = 'C:\Program Files\Microsoft Visual Studio\18\Community\VC\Auxiliary\Build\vcvars64.bat'
+
+# Capture all environment variables set by vcvars64.bat
+# Add the VS installer dir to PATH within the cmd session so vcvars internal
+# calls to vswhere.exe (located there) succeed.
+$vsInstallerDir = 'C:\Program Files (x86)\Microsoft Visual Studio\Installer'
+$cmdLine = "set PATH=$vsInstallerDir;%PATH% && `"$vcvars`" && set"
+$envVars = & cmd /c $cmdLine 2>&1
+foreach ($line in $envVars) {
+    if ($line -match '^([^=]+)=(.*)$') {
+        [System.Environment]::SetEnvironmentVariable($Matches[1], $Matches[2], 'Process')
+    }
+}
+Write-Host "MSVC env activated"
+Write-Host "cl: $(& where.exe cl 2>&1)"
+
+if ($CopyOnly) {
+    Write-Host "--- CopyOnly mode: skipping compile ---"
+} else {
+    $jom      = 'C:\Users\marce\source\repos\StreamLight\scripts\jom.exe'
+    $buildDir = 'C:\Users\marce\source\repos\StreamLight\build\build-x64-release\app'
+
+    Push-Location $buildDir
+    try {
+        Write-Host "--- Running jom -j8 release ---"
+        & $jom -j8 release
+        $jomExit = $LASTEXITCODE
+    } finally {
+        Pop-Location
+    }
+
+    if ($jomExit -ne 0) {
+        Write-Error "jom failed with exit code $jomExit"
+        exit $jomExit
+    }
+    Write-Host "--- jom succeeded ---"
+}
+
+$src = 'C:\Users\marce\source\repos\StreamLight\build\build-x64-release\app\release\StreamLight.exe'
+$dst = 'C:\Users\marce\source\repos\StreamLight\build\deploy-x64-release\StreamLight.exe'
+Copy-Item $src $dst -Force
+Write-Host "--- EXE copied to deploy directory ---"
+Write-Host "DONE"