Use AMF remote desktop latency mode for HEVC broadcasts

tools/chatgui/src/live_video_encoder.cpp

@@ -221,7 +221,9 @@ bool LiveVideoEncoder::open(const LiveVideoConfig& config, Backend backend) {
                     if (config.codec == STREAM_MEDIA_H265) av_dict_set(&options, "tier", "main", 0);
                 }
             } else if (name.endsWith("_amf")) {
-                av_dict_set(&options, "usage", "ultralowlatency", 0);
+                // Для трансляции HEVC используем режим remote desktop; профиль звонков сохраняет ultra-low latency.
+                const char* usage = !constrained && config.codec == STREAM_MEDIA_H265 ? "lowlatency" : "ultralowlatency";
+                av_dict_set(&options, "usage", usage, 0);
                 av_dict_set(&options, "quality", "speed", 0);
                 bool asyncDepth = av_opt_find(c->priv_data, "async_depth", nullptr, 0, 0);
                 if (asyncDepth) av_dict_set(&options, "async_depth", "1", 0);
@@ -235,8 +237,8 @@ bool LiveVideoEncoder::open(const LiveVideoConfig& config, Backend backend) {
                     if (config.codec == STREAM_MEDIA_H265) av_dict_set(&options, "profile_tier", "main", 0);
                 }
                 DEBUG_INFO(DEBUG_CATEGORY_VIDEO,
-                    "desktop AMF low latency settings name=%s usage=ultralowlatency quality=speed async_depth=%s forced_idr=%d",
+                    "desktop AMF low latency settings name=%s usage=%s quality=speed async_depth=%s forced_idr=%d",
-                    name.constData(), asyncDepth ? "1" : "driver", m->forcedKeys);
+                    name.constData(), usage, asyncDepth ? "1" : "driver", m->forcedKeys);
             } else if (name == "libvpx-vp9" || name == "libaom-av1") {
                 av_dict_set(&options, "deadline", "realtime", 0); av_dict_set(&options, "cpu-used", "8", 0);
                 av_dict_set(&options, "lag-in-frames", "0", 0); av_dict_set(&options, "row-mt", "1", 0);