From 4947646cb3d96eb89d03daf97e551de69b809bea Mon Sep 17 00:00:00 2001
From: Seth Van Niekerk <seth@swvn.io>
Date: Tue, 18 Nov 2025 14:40:37 -0500
Subject: [PATCH] further optimization

---
 src/ffmpegConfig.js  | 20 ++++++++++++--------
 src/streamHandler.js | 17 +++++++++++++++--
 2 files changed, 27 insertions(+), 10 deletions(-)

diff --git a/src/ffmpegConfig.js b/src/ffmpegConfig.js
index 32635d6..9e766bd 100644
--- a/src/ffmpegConfig.js
+++ b/src/ffmpegConfig.js
@@ -56,7 +56,7 @@ async function buildFFmpegArgs({ fps, useMusic, musicPath }) {
         '-preset', 'ultrafast',
         '-tune', 'zerolatency',
         '-pix_fmt', 'yuv420p',
-        '-g', fps.toString(),         // Keyframe every second for 1s segments
+        '-g', (fps * 2).toString(),   // Keyframe every 2 seconds for 2s segments
         '-bf', '0',                   // No B-frames for lower latency
         '-x264opts', 'nal-hrd=cbr:no-scenecut',  // Constant bitrate, no scene detection
         '-b:v', '2500k',              // Target bitrate for stable encoding
@@ -75,12 +75,14 @@ async function buildFFmpegArgs({ fps, useMusic, musicPath }) {
         '-max_interleave_delta', '500000',  // Increased for smoother transitions (500ms)
         '-err_detect', 'ignore_err',  // Continue on minor audio errors
         '-f', 'hls',
-        '-hls_time', '1',             // Smaller segments for faster startup
-        '-hls_list_size', '3',        // Fewer segments in playlist
-        '-hls_flags', 'delete_segments+omit_endlist',
+        '-hls_time', '2',             // 2-second segments for better buffering
+        '-hls_list_size', '10',       // Keep more segments in playlist for slower clients
+        '-hls_flags', 'omit_endlist+program_date_time+independent_segments',
+        '-hls_segment_type', 'mpegts',
         '-hls_start_number_source', 'epoch',
         '-start_number', '0',         // Start from segment 0
         '-flush_packets', '1',        // Flush packets immediately
+        '-hls_allow_cache', '0',      // Disable client caching
         'pipe:1'
       );
 
@@ -98,19 +100,21 @@ async function buildFFmpegArgs({ fps, useMusic, musicPath }) {
     '-preset', 'ultrafast',
     '-tune', 'zerolatency',
     '-pix_fmt', 'yuv420p',
-    '-g', fps.toString(),         // Keyframe every second for 1s segments
+    '-g', (fps * 2).toString(),   // Keyframe every 2 seconds for 2s segments
     '-bf', '0',
     '-x264opts', 'nal-hrd=cbr:no-scenecut',
     '-b:v', '2500k',
     '-maxrate', '2500k',
     '-bufsize', '5000k',
     '-f', 'hls',
-    '-hls_time', '1',             // Smaller segments for faster startup
-    '-hls_list_size', '3',        // Fewer segments in playlist
-    '-hls_flags', 'delete_segments+omit_endlist',
+    '-hls_time', '2',             // 2-second segments for better buffering
+    '-hls_list_size', '10',       // Keep more segments in playlist for slower clients
+    '-hls_flags', 'omit_endlist+program_date_time+independent_segments',
+    '-hls_segment_type', 'mpegts',
     '-hls_start_number_source', 'epoch',
     '-start_number', '0',
     '-flush_packets', '1',        // Flush packets immediately
+    '-hls_allow_cache', '0',      // Disable client caching
     'pipe:1'
   );
 
diff --git a/src/streamHandler.js b/src/streamHandler.js
index 16fb56a..2763fc3 100644
--- a/src/streamHandler.js
+++ b/src/streamHandler.js
@@ -33,6 +33,7 @@ async function streamHandler(req, res, { useMusic = false, musicPath, lateGeocod
   let isCleaningUp = false;
   let playlistFile = null;
   let cleanup; // Declare cleanup function variable early
+  let streamId = '[STREAM]'; // Default stream ID
 
   try {
     // Set HLS headers
@@ -65,6 +66,18 @@ async function streamHandler(req, res, { useMusic = false, musicPath, lateGeocod
         '--mute-audio',
         '--disable-breakpad',
         '--disable-component-update',
+        // Resource limits (safe optimizations)
+        '--disable-renderer-backgrounding',
+        '--disable-backgrounding-occluded-windows',
+        '--js-flags=--max-old-space-size=512',  // Limit V8 heap to 512MB
+        '--renderer-process-limit=2', // Limit to 2 renderer processes
+        // Disable unnecessary features
+        '--disable-databases',
+        '--disable-plugins',
+        '--disable-notifications',
+        '--disable-features=AudioServiceOutOfProcess,TranslateUI',
+        '--autoplay-policy=no-user-gesture-required',
+        '--disable-blink-features=AutomationControlled',
         `--window-size=${width},${height}`,
         `--force-device-scale-factor=1`
       ],
@@ -76,8 +89,8 @@ async function streamHandler(req, res, { useMusic = false, musicPath, lateGeocod
     browser = browserInstance;
     playlistFile = ffmpegConfig.playlistFile;
     
-    // Create stream identifier from browser process PID
-    const streamId = `[${browser.process()?.pid || 'STREAM'}]`;
+    // Update stream identifier from browser process PID
+    streamId = `[${browser.process()?.pid || 'STREAM'}]`;
 
     // Start FFmpeg immediately
     ffmpegProcess = spawn('ffmpeg', ['-loglevel', 'error', '-hide_banner', ...ffmpegConfig.args], {