diff --git a/tools/chatgui/src/callwindow.cpp b/tools/chatgui/src/callwindow.cpp
index a5791391..e5f0e04c 100644
--- a/tools/chatgui/src/callwindow.cpp
+++ b/tools/chatgui/src/callwindow.cpp
@@ -191,7 +191,6 @@ CallWindow::CallWindow(QWidget* parent)
     : QWidget(parent, Qt::Window) {
     setWindowTitle(QCoreApplication::translate("ChatGui", "Call"));
     resize(520, 520);
-    setMinimumSize(420, 360);
     setAttribute(Qt::WA_DeleteOnClose, false);
 
     m_avatarLabel = new QLabel(this);
@@ -244,10 +243,14 @@ CallWindow::CallWindow(QWidget* parent)
 
     auto* root = new QVBoxLayout(this);
     root->setContentsMargins(12, 12, 12, 12);
+    root->setSizeConstraint(QLayout::SetMinimumSize);
     m_videoWindow = new CallVideoWindow(this);
     m_panel = new QWidget(this); m_panel->setObjectName("callPanel"); m_panel->setMaximumWidth(640);
     m_panel->setStyleSheet("QWidget#callPanel { background: palette(window); border-radius: 12px; }");
-    root->addWidget(m_panel, 0, Qt::AlignCenter);
+    // Вертикальное центрирование через отступы сохраняет минимальную высоту панели в расчёте размера окна.
+    root->addStretch(1);
+    root->addWidget(m_panel, 0, Qt::AlignHCenter);
+    root->addStretch(1);
     QVBoxLayout* lay = new QVBoxLayout(m_panel);
     lay->setContentsMargins(16, 20, 16, 16);
     lay->setSpacing(8);
@@ -457,6 +460,9 @@ void CallWindow::updateVideoPresentation() {
     m_videoEnabled->setVisible(active); m_settingsBtn->setVisible(active);
     m_videoControls->setVisible(settings); m_showVideoBtn->setVisible(receiving);
     m_videoStatus->setVisible(active && !m_videoStatus->text().isEmpty());
+    QSize panelMinimum = m_panel->minimumSizeHint();
+    DEBUG_DEBUG(DEBUG_CATEGORY_CALL, "call layout active=%d preview=%d settings=%d window=%dx%d panel_min=%dx%d",
+        active, m_localPreview->isVisible(), settings, width(), height(), panelMinimum.width(), panelMinimum.height());
     update();
 }
 
diff --git a/tools/chatgui/src/live_video_encoder.cpp b/tools/chatgui/src/live_video_encoder.cpp
index 13f2cc68..dfa91a79 100644
--- a/tools/chatgui/src/live_video_encoder.cpp
+++ b/tools/chatgui/src/live_video_encoder.cpp
@@ -10,6 +10,7 @@ extern "C" {
 #include <libavcodec/avcodec.h>
 #include <libavcodec/bsf.h>
 #include <libavutil/hwcontext.h>
+#include <libavutil/cpu.h>
 #include <libavutil/opt.h>
 #include <libswscale/swscale.h>
 #endif
@@ -169,8 +170,12 @@ bool LiveVideoEncoder::open(const LiveVideoConfig& config, Backend backend) {
             if (name == "libx264" || name == "libx265") {
                 av_dict_set(&options, "preset", "ultrafast", 0); av_dict_set(&options, "tune", "zerolatency", 0);
                 av_dict_set(&options, "forced-idr", "1", 0);
+                const int workers = std::clamp(av_cpu_count(), 1, 4);
                 QByteArray params = name == "libx264" ? "scenecut=0:open-gop=0:repeat-headers=0"
-                    : "bframes=0:rc-lookahead=0:open-gop=0:pools=1:frame-threads=1:log-level=error";
+                    : "bframes=0:rc-lookahead=0:open-gop=0:frame-threads=1:wpp=1:log-level=error:pools=" + QByteArray::number(workers);
+                if (name == "libx265")
+                    DEBUG_DEBUG(DEBUG_CATEGORY_DEBUG, "live HEVC parallelism workers=%d frame_threads=1 wpp=1 cpu_count=%d",
+                        workers, av_cpu_count());
                 if (constrained) {
                     c->thread_count = 1;
                     av_dict_set(&options, "profile", name == "libx264" ? "baseline" : "main", 0);