fix: update GOP parameters for mediaAnalyzerGOP and transcode2PassX265 to enhance encoding efficiency and documentation

LocalFlowPlugins/video/transcode2PassX265/1.0.0/index.js

@@ -166,8 +166,9 @@ const plugin = async (args) => {
 
   // ── Read variables ────────────────────────────────────────────────────────
   const {
-    gopKeyint    = '48',
-    gopMinKeyint = '48',
+    gopKeyint    = '96',
+    gopMinKeyint = '24',
+    gopSceneCut  = '40',
     vBitrate     = '3000k',
     vMaxRate     = '6000k',
     vBufSize     = '12000k',
@@ -189,7 +190,8 @@ const plugin = async (args) => {
 
   jobLog(
     `[transcode2PassX265] Params: bitrate=${vBitrate} maxrate=${maxRateNum}k `
-    + `bufsize=${bufSizeNum}k keyint=${gopKeyint} tune=${x265Tune || 'none'} preset=${x265Preset}\n`,
+    + `bufsize=${bufSizeNum}k keyint=${gopKeyint} min-keyint=${gopMinKeyint} scenecut=${gopSceneCut} `
+    + `tune=${x265Tune || 'none'} preset=${x265Preset}\n`,
   );
   const sourceBitrateKbps = getVideoBitrateKbps(videoStream, streams, format).toFixed(0);
   jobLog(
@@ -219,7 +221,7 @@ const plugin = async (args) => {
   const x265ParamsBase = [
     `keyint=${gopKeyint}`,
     `min-keyint=${gopMinKeyint}`,
-    `scenecut=0`,
+    `scenecut=${gopSceneCut}`,
     `open-gop=0`,
     `vbv-maxrate=${maxRateNum}`,
     `vbv-bufsize=${bufSizeNum}`,