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

tests/test-cases/test2-anime-25fps.js

@@ -6,7 +6,8 @@
  * Note: DTS detection logic is fully covered in unit tests (quick-logic-test.js).
  *
  * Expected:
- *   gopKeyint        = "50"
+ *   gopKeyint        = "100"
+ *   gopMinKeyint     = "25"
  *   isAnimation      = "true"
  *   isMovie          = "false"
  *   x265Tune         = "animation"
@@ -40,7 +41,9 @@ async function run() {
   });
   const out1 = await analyzerPlugin(args1);
   const vars = out1.variables;
-  assertEqual(vars.gopKeyint,   '50',        'gopKeyint (2 x 25 = 50)');
+  assertEqual(vars.gopKeyint,   '100',       'gopKeyint (4 x 25 = 100)');
+  assertEqual(vars.gopMinKeyint,'25',        'gopMinKeyint (1 x 25 = 25)');
+  assertEqual(vars.gopSceneCut, '40',        'gopSceneCut (x265 default threshold)');
   assertEqual(vars.isMovie,     'false',     'isMovie=false (Sonarr path)');
   assertEqual(vars.isAnimation, 'true',      'isAnimation=true (Naruto in path)');
   assertEqual(vars.x265Tune,    'animation', 'x265Tune=animation');