diff --git a/tools/chatgui/src/call_video_queue.h b/tools/chatgui/src/call_video_queue.h
new file mode 100644
index 00000000..f71823ca
--- /dev/null
+++ b/tools/chatgui/src/call_video_queue.h
@@ -0,0 +1,36 @@
+/* Ограниченный SPSC FIFO: один producer и один consumer, без mutex и аллокаций.
+ * Producer заполняет writeSlot(), затем publish(); consumer читает readSlot(), затем release().
+ * До release слот неизменяем, в том числе во время ожидания GUI ACK.
+ * reset/destruction — только после остановки обоих потоков. Старый payload заменяет producer. */
+#pragma once
+#include <array>
+#include <atomic>
+#include <cstdint>
+
+template<class T, unsigned Capacity> class CallVideoQueue {
+    static_assert(Capacity > 0);
+    static_assert(std::atomic<uint64_t>::is_always_lock_free);
+    std::array<T, Capacity> slots{};
+    alignas(64) std::atomic<uint64_t> written{0};
+    alignas(64) std::atomic<uint64_t> consumed{0};
+public:
+    T* writeSlot() {
+        const uint64_t tail = written.load(std::memory_order_relaxed);
+        return tail - consumed.load(std::memory_order_acquire) < Capacity ? &slots[tail % Capacity] : nullptr;
+    }
+    void publish() { written.fetch_add(1, std::memory_order_release); }
+    const T* readSlot() const {
+        const uint64_t head = consumed.load(std::memory_order_relaxed);
+        return head < written.load(std::memory_order_acquire) ? &slots[head % Capacity] : nullptr;
+    }
+    void release() { consumed.fetch_add(1, std::memory_order_release); }
+    // Вызывается только producer/consumer: собственный индекс во время снимка не меняется.
+    unsigned size() const {
+        const uint64_t head = consumed.load(std::memory_order_acquire);
+        return static_cast<unsigned>(written.load(std::memory_order_acquire) - head);
+    }
+    void reset() {
+        for (auto& slot : slots) slot = {};
+        written.store(0, std::memory_order_relaxed); consumed.store(0, std::memory_order_relaxed);
+    }
+};
diff --git a/tools/chatgui/src/call_video_wake.h b/tools/chatgui/src/call_video_wake.h
index 6cb74426..c7d0ee31 100644
--- a/tools/chatgui/src/call_video_wake.h
+++ b/tools/chatgui/src/call_video_wake.h
@@ -1,27 +1,28 @@
-/* Прерываемое ожидание RX по абсолютному MONOTONIC deadline.
- * notify не вызывает API порта; может исполняться под mutex producer.
- * Windows: auto-reset event + high-resolution waitable timer, без busy-spin/timeBeginPeriod.
- * Остальные платформы: condition_variable. ticket исключает потерю уведомления перед wait. */
+/* Ожидание по абсолютному MONOTONIC deadline, отдельный объект на каждого waiter.
+ * notify не захватывает mutex и допустим под mutex порта. ticket закрывает гонку до wait.
+ * Windows: event + high-resolution timer; POSIX: неблокирующий pipe + pselect.
+ * Ошибки исполнения забирает reporter через takeError(), I/O логов в таймере нет. */
 #pragma once
 #include "../../../src/call/call_video_playout.h"
 #include "debug_config.h"
-#include <condition_variable>
-#include <mutex>
-#include <chrono>
-#ifdef _WIN32
+#include <atomic>
+#include <algorithm>
+#include <cerrno>
 #ifndef NOMINMAX
 #define NOMINMAX
 #endif
 #include "../../../lib/platform_compat.h"
+#ifndef _WIN32
+#include <sys/select.h>
 #endif
 
 class CallVideoWake {
-    std::mutex lock;
-    std::condition_variable changed;
-    uint64_t serial = 0;
+    std::atomic<uint64_t> serial{0};
+    std::atomic<unsigned> error{0};
 #ifdef _WIN32
     HANDLE event = nullptr, timer = nullptr;
-    bool failed = false;
+#else
+    int pipefd[2] = {-1, -1};
 #endif
 public:
     CallVideoWake() {
@@ -36,38 +37,64 @@ public:
         if (!event || !timer) DEBUG_ERROR(DEBUG_CATEGORY_CALL, "video wait handles unavailable event=%p timer=%p error=%lu",
             event, timer, GetLastError());
         else DEBUG_INFO(DEBUG_CATEGORY_CALL, "video RX waitable timer ready event=%p timer=%p", event, timer);
+#else
+        if (pipe(pipefd) || fcntl(pipefd[0], F_SETFL, O_NONBLOCK) < 0 || fcntl(pipefd[1], F_SETFL, O_NONBLOCK) < 0
+            || fcntl(pipefd[0], F_SETFD, FD_CLOEXEC) < 0 || fcntl(pipefd[1], F_SETFD, FD_CLOEXEC) < 0) {
+            DEBUG_ERROR(DEBUG_CATEGORY_CALL, "video wake pipe setup failed errno=%d", errno);
+            for (int& fd : pipefd) { if (fd >= 0) close(fd); fd = -1; }
+        }
 #endif
     }
     ~CallVideoWake() {
 #ifdef _WIN32
         if (timer) CloseHandle(timer);
         if (event) CloseHandle(event);
+#else
+        for (int fd : pipefd) if (fd >= 0) close(fd);
 #endif
     }
-    uint64_t ticket() { std::lock_guard<std::mutex> guard(lock); return serial; }
-    void notify() {
-        { std::lock_guard<std::mutex> guard(lock); ++serial; }
-        changed.notify_one();
+    bool valid() const {
 #ifdef _WIN32
-        if (event && !SetEvent(event)) DEBUG_ERROR(DEBUG_CATEGORY_CALL, "video RX SetEvent failed error=%lu", GetLastError());
+        return event && timer;
+#else
+        return pipefd[0] >= 0 && pipefd[0] < FD_SETSIZE;
+#endif
+    }
+    unsigned takeError() { return error.exchange(0); }
+    uint64_t ticket() const { return serial.load(std::memory_order_acquire); }
+    void notify() {
+        serial.fetch_add(1, std::memory_order_release);
+#ifdef _WIN32
+        if (event && !SetEvent(event)) error.store(GetLastError());
+#else
+        if (pipefd[1] >= 0) {
+            const char byte = 0;
+            if (write(pipefd[1], &byte, 1) < 0 && errno != EAGAIN) error.store(errno);
+        }
 #endif
     }
     void wait(int64_t deadline, uint64_t expected) {
         const int64_t remaining = deadline - call_video_playout_now_us();
         if (remaining <= 0 || ticket() != expected) return;
 #ifdef _WIN32
-        if (event && timer && !failed) {
+        if (event && timer) {
             LARGE_INTEGER due; due.QuadPart = -remaining * 10;
             if (SetWaitableTimer(timer, &due, 0, nullptr, nullptr, FALSE)) {
                 HANDLE handles[] = {event, timer};
                 DWORD result = WaitForMultipleObjects(2, handles, FALSE, INFINITE);
                 if (result == WAIT_OBJECT_0 || result == WAIT_OBJECT_0 + 1) return;
             }
-            failed = true;
-            DEBUG_ERROR(DEBUG_CATEGORY_CALL, "video RX waitable timer failed error=%lu; using condition_variable", GetLastError());
+            error.store(GetLastError());
         }
+#else
+        if (!valid()) return;
+        fd_set fds; FD_ZERO(&fds); FD_SET(pipefd[0], &fds);
+        timespec timeout{remaining / 1000000, (remaining % 1000000) * 1000};
+        int result = pselect(pipefd[0] + 1, &fds, nullptr, nullptr, &timeout, nullptr);
+        if (result > 0) {
+            char bytes[128];
+            if (read(pipefd[0], bytes, sizeof(bytes)) < 0 && errno != EAGAIN) error.store(errno);
+        } else if (result < 0 && errno != EINTR) error.store(errno);
 #endif
-        std::unique_lock<std::mutex> guard(lock);
-        changed.wait_for(guard, std::chrono::microseconds(remaining), [&] { return serial != expected; });
     }
 };