From fe2ccb07e123a9d55d727499dc946110c25aef87 Mon Sep 17 00:00:00 2001
From: evgeny <evgeny@adaptto.ru>
Date: Thu, 15 Oct 2026 02:05:29 +0200
Subject: [PATCH] Keep 60 fps downsampling away from half-period ties

---
 tools/chatgui/src/call_video_cadence.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/chatgui/src/call_video_cadence.h b/tools/chatgui/src/call_video_cadence.h
index bd68cd7e..dfbaad84 100644
--- a/tools/chatgui/src/call_video_cadence.h
+++ b/tools/chatgui/src/call_video_cadence.h
@@ -1,7 +1,7 @@
 #pragma once
 #include <cstdint>
 
-// Сетка 30 fps с допуском половины периода: дрожание PTS не превращает 30 fps в 15.
+// Сетка 30 fps с допуском четверти периода: дрожание PTS не превращает 30 fps в 15.
 class CallVideoCadence {
     int64_t origin = -1, lastSlot = -1;
 public:
@@ -9,7 +9,7 @@ public:
         if (origin < 0) origin = pts;
         if (pts < origin) return false;
         const int64_t elapsed = pts - origin;
-        const int64_t slot = (elapsed / 1000000) * 30 + ((elapsed % 1000000) * 30 + 500000) / 1000000;
+        const int64_t slot = (elapsed / 1000000) * 30 + ((elapsed % 1000000) * 30 + 250000) / 1000000;
         if (slot <= lastSlot) return false;
         lastSlot = slot;
         return true;