diff --git a/tools/chatgui/src/live_video_encoder.cpp b/tools/chatgui/src/live_video_encoder.cpp
index e36f3b37..899c96b3 100644
--- a/tools/chatgui/src/live_video_encoder.cpp
+++ b/tools/chatgui/src/live_video_encoder.cpp
@@ -163,10 +163,13 @@ bool LiveVideoEncoder::open(const LiveVideoConfig& config) {
                 if (constrained) {
                     c->thread_count = 1;
                     av_dict_set(&options, "profile", name == "libx264" ? "baseline" : "main", 0);
-                    QByteArray level = QByteArray::number(config.level / (name == "libx264" ? 10.0 : 30.0), 'f', 1);
+                    // Оба encoder принимают level × 10 целым: дробный разбор зависит от LC_NUMERIC.
+                    QByteArray level = QByteArray::number(name == "libx264" ? config.level : config.level / 3);
                     params += ":ref=1:";
                     if (name == "libx264") params += "level=" + level;
                     else params += "level-idc=" + level + ":high-tier=0:hrd=0:info=0:scenecut=0";
+                    DEBUG_DEBUG(DEBUG_CATEGORY_VIDEO, "live encoder level name=%s contract=%d parameter=%s",
+                        name.constData(), config.level, level.constData());
                 }
                 av_dict_set(&options, name == "libx264" ? "x264-params" : "x265-params", params.constData(), 0);
             } else if (name.endsWith("_nvenc")) {
diff --git a/tools/chatgui/tests/test_call_video_encoder.cpp b/tools/chatgui/tests/test_call_video_encoder.cpp
index d20d6b53..3bc0fa31 100644
--- a/tools/chatgui/tests/test_call_video_encoder.cpp
+++ b/tools/chatgui/tests/test_call_video_encoder.cpp
@@ -1,6 +1,8 @@
 /* Настоящие encoder/decoder: отложенное переключение 4M -> 300k -> 4M,
  * один decoder на весь поток, непрерывные capture PTS и измеренный bitrate. */
 #include <QtTest>
+#include <QScopeGuard>
+#include <clocale>
 #include "../src/call_video_encoder.h"
 #include "../src/call_video_decoder.h"
 #include "../../../src/call/call_video_bitstream.h"
@@ -46,6 +48,32 @@ private slots:
     void switchesAtScheduledIdr_data() {
         QTest::addColumn<int>("codec"); QTest::newRow("H264") << 1; QTest::newRow("H265") << 2;
     }
+    void levelIndependentOfLocale_data() {
+        QTest::addColumn<int>("codec"); QTest::addColumn<QByteArray>("locale");
+        for (int codec : {1, 2}) for (const auto& locale : {QByteArray("C"), QByteArray("ru_RU.UTF-8")})
+            QTest::newRow(qPrintable(QString("codec%1-%2").arg(codec).arg(QString::fromLatin1(locale)))) << codec << locale;
+    }
+    void levelIndependentOfLocale() {
+        QFETCH(int, codec); QFETCH(QByteArray, locale);
+        QByteArray previous = std::setlocale(LC_NUMERIC, nullptr);
+        auto restore = qScopeGuard([previous] { std::setlocale(LC_NUMERIC, previous.constData()); });
+        if (!std::setlocale(LC_NUMERIC, locale.constData())) QSKIP("Requested numeric locale is not installed");
+        if (!avcodec_find_encoder_by_name(codec == 1 ? "libx264" : "libx265")) QSKIP("Software encoder unavailable");
+        auto config = configuration(codec); config.width = 1280; config.height = 720;
+        CallVideoEncoder encoder; QVERIFY2(encoder.open(config, 1000000), qPrintable(encoder.error()));
+        Decoder decoder; QVERIFY(decoder.open(codec));
+        QImage image(config.width, config.height, QImage::Format_RGB32); image.fill(Qt::blue);
+        uint64_t pts = 1000000, request = 0;
+        for (uint32_t bitrate : {1000000u, 300000u, 4000000u}) {
+            QVERIFY(encoder.requestBitrate(config.generation, ++request, bitrate));
+            LiveEncodedFrame output; CallVideoRateCompletion completion;
+            QVERIFY2(encoder.encode(image, pts, true, output, completion), qPrintable(encoder.error()));
+            QCOMPARE(completion.request, request); QCOMPARE(completion.bitrate, bitrate);
+            QVERIFY(decoder.decode(output)); QCOMPARE(decoder.context->level, int(config.level));
+            QCOMPARE(decoder.frame->width, 1280); QCOMPARE(decoder.frame->height, 720);
+            pts += 1000000;
+        }
+    }
     void independentDecoders() {
         auto caps = CallVideoDecoder::capabilities();
         QCOMPARE(caps.decode[0].profiles, uint8_t(3)); QCOMPARE(caps.decode[1].profiles, uint8_t(1));