diff --git a/WebRTCControlled/app/src/main/java/com/ttstd/controlled/service/ScreenCaptureService.java b/WebRTCControlled/app/src/main/java/com/ttstd/controlled/service/ScreenCaptureService.java
index 34352cd..091d060 100644
--- a/WebRTCControlled/app/src/main/java/com/ttstd/controlled/service/ScreenCaptureService.java
+++ b/WebRTCControlled/app/src/main/java/com/ttstd/controlled/service/ScreenCaptureService.java
@@ -301,6 +301,11 @@ public class ScreenCaptureService extends Service {
         currentCaptureHeight = targetH;
         currentCaptureFps = targetFps;
 
+        // 关键：分辨率切换后，如果是自编码模式，同样需要触发扰动确保产生首帧，避免静态画面黑屏。
+        if (currentStreamMode == SelfCodecEncoder.STREAM_MODE_SELF_CODEC) {
+            updateNotification("正在切换分辨率...");
+        }
+
         Log.i(TAG, "Capture resolution changed -> " + targetW + "x" + targetH + " @ " + targetFps + "fps (remote=" + fromRemote + ")");
         showToast(getString(R.string.resolution_changed_message, targetW, targetH));
 
@@ -354,7 +359,19 @@ public class ScreenCaptureService extends Service {
             if (webRtcClient != null) {
                 webRtcClient.stopCapture();
             }
-            startSelfCodecEncoder();
+            if (!startSelfCodecEncoder()) {
+                // 启动失败（如 Android 14+ 不允许复用投屏授权令牌）：
+                // 回退 WebRTC 模式并如实上报，避免两端都黑屏。
+                Log.e(TAG, "switch to self codec failed, fallback to webrtc mode");
+                if (webRtcClient != null) {
+                    webRtcClient.startCapture();
+                }
+                currentStreamMode = SelfCodecEncoder.STREAM_MODE_WEBRTC;
+                reportStreamMode(SelfCodecEncoder.STREAM_MODE_WEBRTC);
+                return;
+            }
+            // 关键：切换到自编码模式后，立即触发一次通知刷新（扰动），确保 MediaProjection 产生首帧并喂入编码器。
+            updateNotification("正在使用自编码模式串流...");
         } else {
             // 切回 WebRTC：停止自编码，恢复默认屏幕采集。
             stopSelfCodecEncoder();
@@ -371,10 +388,11 @@ public class ScreenCaptureService extends Service {
         return currentStreamMode;
     }
 
-    private void startSelfCodecEncoder() {
+    /** 启动自编码通道。返回 false 表示启动失败（调用方应回退 WebRTC 模式）。 */
+    private boolean startSelfCodecEncoder() {
         if (selfEncoder != null) {
             Log.w(TAG, "self codec encoder already running");
-            return;
+            return true;
         }
         if (webRtcClient == null || !webRtcClient.isVideoDataChannelOpen()) {
             Log.w(TAG, "startSelfCodecEncoder: video channel not ready yet");
@@ -385,7 +403,7 @@ public class ScreenCaptureService extends Service {
             selfMediaProjection = mpm.getMediaProjection(resultCode, resultDataIntent);
         } catch (Exception e) {
             Log.e(TAG, "getMediaProjection for self codec failed", e);
-            return;
+            return false;
         }
         int dpi = getResources().getDisplayMetrics().densityDpi;
         int[] res = getCurrentCaptureResolution();
@@ -406,6 +424,7 @@ public class ScreenCaptureService extends Service {
                     }
                 });
         selfEncoder.start();
+        return true;
     }
 
     private void stopSelfCodecEncoder() {
@@ -537,6 +556,16 @@ public class ScreenCaptureService extends Service {
         webRtcClient = new WebRtcClient(this, wsClient, deviceId);
         webRtcClient.initialize(eglBase);
         webRtcClient.setInputCallback(commandBytes -> inputHandler.handleCommand(commandBytes));
+        webRtcClient.setIceEventListener(() -> {
+            mainHandler.post(() -> {
+                if (currentStreamMode == SelfCodecEncoder.STREAM_MODE_SELF_CODEC && selfEncoder != null) {
+                    selfEncoder.requestKeyFrame();
+                    updateNotification("远程控制已连接 (自编码)");
+                } else {
+                    updateNotification("远程控制已连接");
+                }
+            });
+        });
         // 注册远程控制断开回调：控制端断线时提示其用户名。
         webRtcClient.setRemoteDisconnectCallback(controllerId ->
                 mainHandler.post(() -> onControllerDisconnected(controllerId)));
diff --git a/WebRTCControlled/app/src/main/java/com/ttstd/controlled/webrtc/SelfCodecEncoder.java b/WebRTCControlled/app/src/main/java/com/ttstd/controlled/webrtc/SelfCodecEncoder.java
index 57fe4cb..1d30813 100644
--- a/WebRTCControlled/app/src/main/java/com/ttstd/controlled/webrtc/SelfCodecEncoder.java
+++ b/WebRTCControlled/app/src/main/java/com/ttstd/controlled/webrtc/SelfCodecEncoder.java
@@ -48,6 +48,9 @@ public class SelfCodecEncoder {
     private boolean running = false;
     private int frameSeq = 0;
     private final Object sendLock = new Object();
+    // 缓存 SPS/PPS 等参数集：video 通道不可靠（可能丢包），在每个关键帧前重发，
+    // 保证控制端即使错过首次 CONFIG 也能在下一个 IDR 前完成解码器配置。
+    private final java.util.ArrayList<byte[]> cachedConfigs = new java.util.ArrayList<>();
 
     public interface Callback {
         void onEncoderStarted(int w, int h, int fps);
@@ -79,9 +82,10 @@ public class SelfCodecEncoder {
             format.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 1);
 
             encoder = MediaCodec.createEncoderByType(MediaFormat.MIMETYPE_VIDEO_AVC);
+            // 异步回调需在 configure() 之前设置（部分系统版本在 configure 后设置会抛异常）
+            encoder.setCallback(encoderCallback);
             encoder.configure(format, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
             inputSurface = encoder.createInputSurface();
-            encoder.setCallback(encoderCallback);
             encoder.start();
 
             virtualDisplay = mediaProjection.createVirtualDisplay(
@@ -132,8 +136,14 @@ public class SelfCodecEncoder {
                 mc.releaseOutputBuffer(index, false);
 
                 if (isConfig) {
+                    cacheConfig(data);
                     sendUnit(UNIT_TYPE_CONFIG, 0, false, data);
                 } else {
+                    if (isKey) {
+                        // 关键帧前重发参数集：解码端已配置时会忽略重复 CONFIG，
+                        // 未配置（首次 CONFIG 丢失/通道未就绪）时借此完成配置。
+                        resendCachedConfigs();
+                    }
                     sendUnit(UNIT_TYPE_FRAME, pts, isKey, data);
                 }
             } catch (Exception e) {
@@ -152,8 +162,39 @@ public class SelfCodecEncoder {
         if (format == null) return;
         ByteBuffer sps = format.getByteBuffer("csd-0");
         ByteBuffer pps = format.getByteBuffer("csd-1");
-        if (sps != null) sendUnit(UNIT_TYPE_CONFIG, 0, false, toBytes(sps));
-        if (pps != null) sendUnit(UNIT_TYPE_CONFIG, 0, false, toBytes(pps));
+        if (sps != null) {
+            byte[] d = toBytes(sps);
+            cacheConfig(d);
+            sendUnit(UNIT_TYPE_CONFIG, 0, false, d);
+        }
+        if (pps != null) {
+            byte[] d = toBytes(pps);
+            cacheConfig(d);
+            sendUnit(UNIT_TYPE_CONFIG, 0, false, d);
+        }
+    }
+
+    /** 缓存参数集（去重），供关键帧前重发。 */
+    private void cacheConfig(byte[] data) {
+        if (data == null || data.length == 0) return;
+        synchronized (cachedConfigs) {
+            for (byte[] c : cachedConfigs) {
+                if (java.util.Arrays.equals(c, data)) return;
+            }
+            cachedConfigs.add(data);
+        }
+    }
+
+    /** 在每个关键帧前重发缓存的参数集。 */
+    private void resendCachedConfigs() {
+        byte[][] snapshot;
+        synchronized (cachedConfigs) {
+            if (cachedConfigs.isEmpty()) return;
+            snapshot = cachedConfigs.toArray(new byte[0][]);
+        }
+        for (byte[] c : snapshot) {
+            sendUnit(UNIT_TYPE_CONFIG, 0, false, c);
+        }
     }
 
     private static byte[] toBytes(ByteBuffer b) {
diff --git a/WebRTCControlled/app/src/main/java/com/ttstd/controlled/webrtc/WebRtcClient.java b/WebRTCControlled/app/src/main/java/com/ttstd/controlled/webrtc/WebRtcClient.java
index 05b89ec..d4c7b04 100644
--- a/WebRTCControlled/app/src/main/java/com/ttstd/controlled/webrtc/WebRtcClient.java
+++ b/WebRTCControlled/app/src/main/java/com/ttstd/controlled/webrtc/WebRtcClient.java
@@ -72,6 +72,12 @@ public class WebRtcClient {
     private RemoteDisconnectCallback remoteDisconnectCallback;
     private boolean remoteDisconnectNotified = false;
 
+    public interface IceEventListener {
+        void onIceConnected();
+    }
+
+    private IceEventListener iceEventListener;
+
     // 关键修复：控制端（网页）会在被控端弹出"接受"对话框期间就把 ICE 候选发过来，
     // 此时 peerConnection 尚未创建 / 远端描述(offer)尚未设置，直接 addIceCandidate 会被丢弃。
     // 因此先把候选缓存起来，等 setRemoteDescription(offer) 完成后再统一 flush。
@@ -101,6 +107,10 @@ public class WebRtcClient {
         this.remoteDisconnectCallback = callback;
     }
 
+    public void setIceEventListener(IceEventListener listener) {
+        this.iceEventListener = listener;
+    }
+
     private void notifyRemoteDisconnected() {
         if (remoteDisconnectNotified) return;
         remoteDisconnectNotified = true;
@@ -266,8 +276,10 @@ public class WebRtcClient {
             public void onIceConnectionChange(PeerConnection.IceConnectionState newState) {
                 Log.d(TAG, "ICE connection state: " + newState);
                 if (newState == PeerConnection.IceConnectionState.CONNECTED) {
-                    // 连接成功时，诱发编码器产生一个关键帧，而不是重启采集器
+                    // 连接成功时，诱发编码器产生一个关键帧。
+                    // 外部 ScreenCaptureService 可通过 registerObserver 等方式监听，或者我们直接在此处回调。
                     triggerKeyFrame();
+                    if (iceEventListener != null) iceEventListener.onIceConnected();
                 } else if (newState == PeerConnection.IceConnectionState.DISCONNECTED
                         || newState == PeerConnection.IceConnectionState.FAILED
                         || newState == PeerConnection.IceConnectionState.CLOSED) {
@@ -631,4 +643,12 @@ public class WebRtcClient {
             }
         }
     }
+
+    /** 即时请求自编码器产生一个关键帧。 */
+    public void requestSelfCodecKeyFrame(SelfCodecEncoder encoder) {
+        if (encoder != null) {
+            Log.d(TAG, "Requesting key frame for self codec encoder");
+            encoder.requestKeyFrame();
+        }
+    }
 }
diff --git a/WebRTCController/app/src/main/java/com/ttstd/controller/webrtc/SelfCodecDecoder.java b/WebRTCController/app/src/main/java/com/ttstd/controller/webrtc/SelfCodecDecoder.java
index 1c269bc..6a8cea1 100644
--- a/WebRTCController/app/src/main/java/com/ttstd/controller/webrtc/SelfCodecDecoder.java
+++ b/WebRTCController/app/src/main/java/com/ttstd/controller/webrtc/SelfCodecDecoder.java
@@ -2,6 +2,7 @@ package com.ttstd.controller.webrtc;
 
 import android.media.MediaCodec;
 import android.media.MediaFormat;
+import android.os.Build;
 import android.util.Log;
 import android.view.Surface;
 
@@ -33,6 +34,10 @@ public class SelfCodecDecoder {
     private boolean configured = false;
     private boolean enabled = false;
 
+    // 实际宽高（由被控端 REPORT_RESOLUTION 上报），若未上报则使用 PLACEHOLDER
+    private int videoWidth = PLACEHOLDER_W;
+    private int videoHeight = PLACEHOLDER_H;
+
     // 待喂入的参数集（SPS/PPS 等），以 CODEC_CONFIG 形式输入解码器
     private final ArrayDeque<byte[]> pendingConfigs = new ArrayDeque<>();
     // 待解码帧
@@ -67,6 +72,23 @@ public class SelfCodecDecoder {
         }
     }
 
+    /**
+     * 更新当前视频流的实际宽高（由外部 WebRtcClient 收到被控端上报后调用）。
+     * 如果宽高发生变化且解码器已配置，则重置解码器以应用新分辨率，避免黑屏或花屏。
+     */
+    public void updateResolution(int w, int h) {
+        if (w <= 0 || h <= 0) return;
+        if (this.videoWidth != w || this.videoHeight != h) {
+            Log.i(TAG, "Resolution update: " + videoWidth + "x" + videoHeight + " -> " + w + "x" + h);
+            this.videoWidth = w;
+            this.videoHeight = h;
+            if (configured) {
+                // 分辨率变化时需重置解码器以重新 configure
+                releaseDecoder();
+            }
+        }
+    }
+
     /** 收到 video DataChannel 的二进制消息（一条分片）。 */
     public void onBinaryMessage(ByteBuffer raw) {
         if (!enabled) return;
@@ -76,6 +98,11 @@ public class SelfCodecDecoder {
         byte magic = b.get();
         if (magic != MAGIC) return;
         int seq = b.getInt();
+        // 关键修复：增加包序号过期检查（处理包乱序或重复）。
+        // 实时视频流中，如果收到了序号更旧的包，直接丢弃以保证延迟和状态一致性。
+        if (lastSeq != -1 && seq <= lastSeq && (lastSeq - seq) < 1000) {
+            return;
+        }
         short total = b.getShort();
         short idx = b.getShort();
         int len = b.getInt();
@@ -83,30 +110,32 @@ public class SelfCodecDecoder {
         byte[] chunk = new byte[len];
         b.get(chunk);
 
-        ChunkBuffer cb = assembling.get(seq);
-        if (cb == null) {
-            cb = new ChunkBuffer();
-            cb.total = total;
-            cb.chunks = new byte[total][];
-            cb.received = 0;
-            assembling.put(seq, cb);
-            if (assembling.size() > 24) {
-                int min = Integer.MAX_VALUE;
-                for (int k : assembling.keySet()) {
-                    if (k < min) min = k;
+        synchronized (assembling) {
+            ChunkBuffer cb = assembling.get(seq);
+            if (cb == null) {
+                cb = new ChunkBuffer();
+                cb.total = total;
+                cb.chunks = new byte[total][];
+                cb.received = 0;
+                assembling.put(seq, cb);
+                if (assembling.size() > 24) {
+                    int min = Integer.MAX_VALUE;
+                    for (int k : assembling.keySet()) {
+                        if (k < min) min = k;
+                    }
+                    assembling.remove(min);
                 }
-                assembling.remove(min);
             }
-        }
-        if (idx >= 0 && idx < total && cb.chunks[idx] == null) {
-            cb.chunks[idx] = chunk;
-            cb.received++;
-        }
-        if (cb.received == total) {
-            assembling.remove(seq);
-            if (seq > lastSeq) lastSeq = seq;
-            byte[] unit = join(cb);
-            if (unit != null) handleUnit(unit);
+            if (idx >= 0 && idx < total && cb.chunks[idx] == null) {
+                cb.chunks[idx] = chunk;
+                cb.received++;
+            }
+            if (cb.received == total) {
+                assembling.remove(seq);
+                if (seq > lastSeq) lastSeq = seq;
+                byte[] unit = join(cb);
+                if (unit != null) handleUnit(unit);
+            }
         }
     }
 
@@ -132,14 +161,25 @@ public class SelfCodecDecoder {
         b.get(data);
 
         if (type == UNIT_TYPE_CONFIG) {
-            if (configured) {
-                // 已配置：忽略重复/初始参数集，避免重复以 CODEC_CONFIG 喂入报错
-                return;
-            }
             synchronized (pendingConfigs) {
-                pendingConfigs.add(data);
+                // 仅在尚未包含该配置时添加，避免关键帧前的重复重发堆积。
+                // 关键：不因为 configured 而 return，确保 SPS 和 PPS 都能被加入队列。
+                boolean exists = false;
+                for (byte[] c : pendingConfigs) {
+                    if (java.util.Arrays.equals(c, data)) {
+                        exists = true;
+                        break;
+                    }
+                }
+                if (!exists) {
+                    pendingConfigs.add(data);
+                }
+            }
+            if (!configured) {
+                tryConfigure();
+            } else {
+                feed(); // 已配置时也尝试喂入，以应对中途可能的参数集更新
             }
-            tryConfigure();
         } else if (type == UNIT_TYPE_FRAME) {
             Frame f = new Frame();
             f.data = data;
@@ -160,29 +200,50 @@ public class SelfCodecDecoder {
         }
         try {
             MediaFormat format = MediaFormat.createVideoFormat(
-                    MediaFormat.MIMETYPE_VIDEO_AVC, PLACEHOLDER_W, PLACEHOLDER_H);
+                    MediaFormat.MIMETYPE_VIDEO_AVC, videoWidth, videoHeight);
+            // 关键：对部分芯片组（如 MTK/Exynos），低延迟标志有助于减少首帧黑屏时间（API 30+）
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+                format.setInteger(MediaFormat.KEY_LOW_LATENCY, 1);
+            }
             decoder = MediaCodec.createDecoderByType(MediaFormat.MIMETYPE_VIDEO_AVC);
-            decoder.configure(format, surface, null, 0);
+            // 异步回调必须在 configure() 之前设置，否则抛 IllegalStateException，
+            // 解码器将永远无法进入工作状态（黑屏）。
             decoder.setCallback(decoderCallback);
+            decoder.configure(format, surface, null, 0);
             decoder.start();
             configured = true;
             Log.i(TAG, "self codec decoder configured");
             feed();
         } catch (Exception e) {
             Log.e(TAG, "decoder configure failed", e);
+            // 清理半初始化的解码器，等待下一个 CONFIG 到达后重试
+            if (decoder != null) {
+                try {
+                    decoder.release();
+                } catch (Exception ignored) {
+                }
+                decoder = null;
+            }
+            configured = false;
         }
     }
 
     private final MediaCodec.Callback decoderCallback = new MediaCodec.Callback() {
         @Override
         public void onInputBufferAvailable(MediaCodec mc, int index) {
-            inputQueue.add(index);
+            synchronized (inputQueue) {
+                inputQueue.add(index);
+            }
             feed();
         }
 
         @Override
         public void onOutputBufferAvailable(MediaCodec mc, int index, MediaCodec.BufferInfo info) {
-            mc.releaseOutputBuffer(index, true);
+            try {
+                mc.releaseOutputBuffer(index, true);
+            } catch (IllegalStateException e) {
+                Log.w(TAG, "onOutputBufferAvailable: codec might be stopped/released", e);
+            }
         }
 
         @Override
@@ -199,42 +260,51 @@ public class SelfCodecDecoder {
     private void feed() {
         if (decoder == null || !configured) return;
         synchronized (pendingConfigs) {
-            while (!pendingConfigs.isEmpty() && !inputQueue.isEmpty()) {
-                byte[] cfg = pendingConfigs.poll();
-                int idx = inputQueue.poll();
-                try {
-                    ByteBuffer ib = decoder.getInputBuffer(idx);
-                    ib.clear();
-                    ib.put(cfg);
-                    decoder.queueInputBuffer(idx, 0, cfg.length, 0, MediaCodec.BUFFER_FLAG_CODEC_CONFIG);
-                } catch (Exception e) {
-                    Log.e(TAG, "queue config failed", e);
-                    pendingConfigs.addFirst(cfg);
-                    inputQueue.addFirst(idx);
-                    break;
+            synchronized (inputQueue) {
+                while (!pendingConfigs.isEmpty() && !inputQueue.isEmpty()) {
+                    byte[] cfg = pendingConfigs.poll();
+                    int idx = inputQueue.poll();
+                    try {
+                        ByteBuffer ib = decoder.getInputBuffer(idx);
+                        ib.clear();
+                        ib.put(cfg);
+                        decoder.queueInputBuffer(idx, 0, cfg.length, 0, MediaCodec.BUFFER_FLAG_CODEC_CONFIG);
+                    } catch (Exception e) {
+                        Log.e(TAG, "queue config failed", e);
+                        pendingConfigs.addFirst(cfg);
+                        inputQueue.addFirst(idx);
+                        break;
+                    }
                 }
             }
         }
         synchronized (frameQueue) {
-            while (!frameQueue.isEmpty() && !inputQueue.isEmpty()) {
-                Frame f = frameQueue.poll();
-                int idx = inputQueue.poll();
-                try {
-                    ByteBuffer ib = decoder.getInputBuffer(idx);
-                    ib.clear();
-                    ib.put(f.data);
-                    decoder.queueInputBuffer(idx, 0, f.data.length, f.pts, f.flags);
-                } catch (Exception e) {
-                    Log.e(TAG, "queue frame failed", e);
-                    frameQueue.addFirst(f);
-                    inputQueue.addFirst(idx);
-                    break;
+            synchronized (inputQueue) {
+                while (!frameQueue.isEmpty() && !inputQueue.isEmpty()) {
+                    Frame f = frameQueue.poll();
+                    int idx = inputQueue.poll();
+                    try {
+                        ByteBuffer ib = decoder.getInputBuffer(idx);
+                        ib.clear();
+                        ib.put(f.data);
+                        decoder.queueInputBuffer(idx, 0, f.data.length, f.pts, f.flags);
+                    } catch (Exception e) {
+                        Log.e(TAG, "queue frame failed", e);
+                        frameQueue.addFirst(f);
+                        inputQueue.addFirst(idx);
+                        break;
+                    }
                 }
             }
         }
     }
 
     private void releaseDecoder() {
+        configured = false;
+        synchronized (assembling) {
+            lastSeq = -1; // 释放时重置序号，避免重连后首帧被误判为过期
+            assembling.clear();
+        }
         if (decoder != null) {
             try {
                 decoder.stop();
@@ -246,11 +316,15 @@ public class SelfCodecDecoder {
             }
             decoder = null;
         }
-        configured = false;
-        pendingConfigs.clear();
-        frameQueue.clear();
-        inputQueue.clear();
-        assembling.clear();
+        synchronized (pendingConfigs) {
+            pendingConfigs.clear();
+        }
+        synchronized (frameQueue) {
+            frameQueue.clear();
+        }
+        synchronized (inputQueue) {
+            inputQueue.clear();
+        }
     }
 
     public void release() {
diff --git a/WebRTCController/app/src/main/java/com/ttstd/controller/webrtc/WebRtcClient.java b/WebRTCController/app/src/main/java/com/ttstd/controller/webrtc/WebRtcClient.java
index bf8c7cd..7f1f72c 100644
--- a/WebRTCController/app/src/main/java/com/ttstd/controller/webrtc/WebRtcClient.java
+++ b/WebRTCController/app/src/main/java/com/ttstd/controller/webrtc/WebRtcClient.java
@@ -318,6 +318,15 @@ public class WebRtcClient {
     }
 
     private void handleDataChannel(DataChannel dc) {
+        if (dc == null) return;
+        // 关键修复：区分控制端创建的两条通道。
+        // 虽然本端是创建方，但 PeerObserver.onDataChannel 仍可能在某些 WebRTC 协商逻辑中被触发。
+        if (VIDEO_CHANNEL_LABEL.equals(dc.label())) {
+            this.videoDataChannel = dc;
+            setupVideoDataChannel(dc);
+            return;
+        }
+        this.dataChannel = dc;
         dc.registerObserver(new DataChannel.Observer() {
             @Override
             public void onBufferedAmountChange(long previousAmount) {}
@@ -337,14 +346,18 @@ public class WebRtcClient {
                 if (buffer == null || buffer.data == null) return;
                 byte[] data = new byte[buffer.data.remaining()];
                 buffer.data.get(data);
-                // 若收到被控端回报的串流模式，单独处理。
+                // 收到被控端回报的消息，按 Action 分发处理。
                 try {
                     ControlMessage msg = ControlMessage.parseFrom(data);
                     if (msg.getAction() == Action.REPORT_STREAM_MODE) {
                         if (streamModeReportListener != null) {
                             streamModeReportListener.onStreamModeReported(msg.getStreamMode());
                         }
-                        return;
+                    } else if (msg.getAction() == Action.REPORT_RESOLUTION) {
+                        Log.i(TAG, "Received resolution report: " + msg.getWidth() + "x" + msg.getHeight());
+                        if (selfCodecDecoder != null) {
+                            selfCodecDecoder.updateResolution(msg.getWidth(), msg.getHeight());
+                        }
                     }
                 } catch (Exception ignored) {
                 }
diff --git a/webrtc_controller_flutter/android/app/src/main/kotlin/com/ttstd/fluttercontroller/SelfCodecDecoderPlugin.kt b/webrtc_controller_flutter/android/app/src/main/kotlin/com/ttstd/fluttercontroller/SelfCodecDecoderPlugin.kt
index f2934a7..5c5a44b 100644
--- a/webrtc_controller_flutter/android/app/src/main/kotlin/com/ttstd/fluttercontroller/SelfCodecDecoderPlugin.kt
+++ b/webrtc_controller_flutter/android/app/src/main/kotlin/com/ttstd/fluttercontroller/SelfCodecDecoderPlugin.kt
@@ -141,8 +141,9 @@ class SelfCodecDecoderPlugin :
         val st = entry.surfaceTexture()
         surfaceTexture = st
         st.setDefaultBufferSize(PLACEHOLDER_W, PLACEHOLDER_H)
+        // MediaCodec 把解码帧渲染到该 SurfaceTexture。必须消费（updateTexImage）
+        // 新帧，否则 SurfaceTexture 一直停留在初始（黑）帧，导致切换自编码后无画面。
         st.setOnFrameAvailableListener { texture: SurfaceTexture ->
-            // 解码器将帧渲染到 Surface 后触发，这里更新纹理内容供 Flutter 显示。
             try {
                 texture.updateTexImage()
             } catch (e: Exception) {
@@ -251,8 +252,11 @@ class SelfCodecDecoderPlugin :
                     }
 
                     override fun onOutputFormatChanged(codec: MediaCodec, format: MediaFormat) {
-                        val w = format.getInteger(MediaFormat.KEY_WIDTH, 0)
-                        val h = format.getInteger(MediaFormat.KEY_HEIGHT, 0)
+                        // getInteger(key, default) 需要 API 29+，用 containsKey 兼容低版本
+                        val w = if (format.containsKey(MediaFormat.KEY_WIDTH))
+                            format.getInteger(MediaFormat.KEY_WIDTH) else 0
+                        val h = if (format.containsKey(MediaFormat.KEY_HEIGHT))
+                            format.getInteger(MediaFormat.KEY_HEIGHT) else 0
                         if (w > 0 && h > 0) {
                             surfaceTexture?.setDefaultBufferSize(w, h)
                             mainHandler.post {
diff --git a/webrtc_controller_flutter/lib/controller/remote_controller.dart b/webrtc_controller_flutter/lib/controller/remote_controller.dart
index 1352d08..734715f 100644
--- a/webrtc_controller_flutter/lib/controller/remote_controller.dart
+++ b/webrtc_controller_flutter/lib/controller/remote_controller.dart
@@ -27,6 +27,9 @@ class RemoteController {
   /// WebRTC 连接建立（可开始远程控制）。
   void Function()? onConnectionEstablished;
 
+  /// 连接失败。
+  void Function(String error)? onConnectionFailed;
+
   /// 连接断开。
   void Function()? onDisconnected;
 
@@ -48,6 +51,9 @@ class RemoteController {
   /// 自编码解码纹理已就绪（textureId >= 0）。
   void Function(int textureId)? onSelfCodecReady;
 
+  /// 自编码解码器已释放（连接断开时）。
+  void Function()? onSelfCodecLost;
+
   /// 被控端上报当前生效的串流模式。
   void Function(int mode)? onStreamModeReport;
 
@@ -99,17 +105,20 @@ class RemoteController {
       onConnectionEstablished?.call();
       _startStats();
     };
+    _webRtc!.onConnectionFailed = (error) => onConnectionFailed?.call(error);
     _webRtc!.onDisconnected = () {
       onDisconnected?.call();
     };
     _webRtc!.onIceDisconnected = (message) => onIceDisconnected?.call(message);
     _webRtc!.onRemoteStream = (renderer) => onRemoteStream?.call(renderer);
     _webRtc!.onSelfCodecReady = (id) => onSelfCodecReady?.call(id);
+    _webRtc!.onSelfCodecLost = () => onSelfCodecLost?.call();
     _webRtc!.onStreamModeReport = (mode) => onStreamModeReport?.call(mode);
     _webRtc!.onResolutionReported = (w, h) => onResolutionReported?.call(w, h);
     _webRtc!.onSelfCodecNotSupported = () => onSelfCodecNotSupported?.call();
     _webRtc!.initialize().catchError((e) {
       onStatusChanged?.call('状态: 连接失败 - $e');
+      onConnectionFailed?.call(e.toString());
     });
   }
 
diff --git a/webrtc_controller_flutter/lib/main.dart b/webrtc_controller_flutter/lib/main.dart
index 1fd0d0e..f615098 100644
--- a/webrtc_controller_flutter/lib/main.dart
+++ b/webrtc_controller_flutter/lib/main.dart
@@ -126,6 +126,69 @@ class _ControllerHomeState extends State<ControllerHome> {
     String selectedType = 'NONE';
     final valueController = TextEditingController();
 
+    // 纵向选项列表，避免分段控件在窄弹窗中把中文选项挤压成两行。
+    Widget buildOption(
+      String value,
+      String title,
+      String desc,
+      void Function(void Function()) setDialogState,
+    ) {
+      final selected = selectedType == value;
+      return GestureDetector(
+        onTap: () => setDialogState(() => selectedType = value),
+        child: Container(
+          padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
+          margin: const EdgeInsets.only(bottom: 8),
+          decoration: BoxDecoration(
+            border: Border.all(
+              color: selected
+                  ? CupertinoColors.activeBlue
+                  : CupertinoColors.systemGrey4,
+            ),
+            borderRadius: BorderRadius.circular(10),
+            color: selected
+                ? CupertinoColors.activeBlue.withValues(alpha: 0.06)
+                : null,
+          ),
+          child: Row(
+            children: [
+              Expanded(
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Text(
+                      title,
+                      style: const TextStyle(
+                        fontSize: 15,
+                        fontWeight: FontWeight.w500,
+                      ),
+                    ),
+                    const SizedBox(height: 2),
+                    Text(
+                      desc,
+                      style: const TextStyle(
+                        fontSize: 12,
+                        color: CupertinoColors.systemGrey,
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+              const SizedBox(width: 8),
+              Icon(
+                selected
+                    ? CupertinoIcons.check_mark_circled_solid
+                    : CupertinoIcons.circle,
+                color: selected
+                    ? CupertinoColors.activeBlue
+                    : CupertinoColors.systemGrey,
+              ),
+            ],
+          ),
+        ),
+      );
+    }
+
     await showCupertinoDialog<void>(
       context: context,
       builder: (ctx) => StatefulBuilder(
@@ -134,37 +197,37 @@ class _ControllerHomeState extends State<ControllerHome> {
           content: Column(
             children: [
               const SizedBox(height: 12),
-              CupertinoSegmentedControl<String>(
-                children: const {
-                  'NONE': Padding(
-                    padding: EdgeInsets.symmetric(horizontal: 8),
-                    child: Text('免密连接'),
-                  ),
-                  'CODE': Padding(
-                    padding: EdgeInsets.symmetric(horizontal: 8),
-                    child: Text('动态验证码'),
-                  ),
-                  'PASSWORD': Padding(
-                    padding: EdgeInsets.symmetric(horizontal: 8),
-                    child: Text('固定密码'),
-                  ),
-                },
-                groupValue: selectedType,
-                onValueChanged: (v) => setDialogState(() => selectedType = v),
+              buildOption(
+                'NONE',
+                '免密连接',
+                '被控端弹出手动确认框，无需验证码或密码',
+                setDialogState,
+              ),
+              buildOption(
+                'CODE',
+                '动态验证码',
+                '使用一次性动态验证码鉴权',
+                setDialogState,
+              ),
+              buildOption(
+                'PASSWORD',
+                '固定密码',
+                '使用固定连接密码鉴权',
+                setDialogState,
+              ),
+              const SizedBox(height: 4),
+              CupertinoTextField(
+                controller: valueController,
+                enabled: selectedType != 'NONE',
+                placeholder: selectedType == 'NONE'
+                    ? '免密连接，无需填写'
+                    : selectedType == 'PASSWORD'
+                        ? '请输入固定密码'
+                        : '请输入动态验证码',
+                obscureText: true,
+                padding:
+                    const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
               ),
-              const SizedBox(height: 12),
-              if (selectedType == 'NONE')
-                const Text(
-                  '免密连接：被控端将弹出手动确认对话框，无需输入验证码或密码。',
-                  style: TextStyle(fontSize: 13, color: CupertinoColors.systemGrey),
-                )
-              else
-                CupertinoTextField(
-                  controller: valueController,
-                  placeholder: selectedType == 'PASSWORD' ? '请输入固定密码' : '请输入动态验证码',
-                  obscureText: true,
-                  padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
-                ),
             ],
           ),
           actions: [
@@ -245,6 +308,14 @@ class _ControllerHomeState extends State<ControllerHome> {
         });
       }
     };
+    _controller!.onSelfCodecLost = () {
+      if (mounted) {
+        setState(() {
+          _selfCodecReady = false;
+          _selfCodecTextureId = null;
+        });
+      }
+    };
     _controller!.onStreamModeReport = (mode) {
       if (mounted) setState(() => _streamMode = mode);
     };
diff --git a/webrtc_controller_flutter/lib/webrtc/webrtc_controller.dart b/webrtc_controller_flutter/lib/webrtc/webrtc_controller.dart
index 562db58..4a7f6da 100644
--- a/webrtc_controller_flutter/lib/webrtc/webrtc_controller.dart
+++ b/webrtc_controller_flutter/lib/webrtc/webrtc_controller.dart
@@ -217,7 +217,13 @@ class WebRtcController {
     switch (msg.action) {
       case Action.REPORT_STREAM_MODE:
         _currentStreamMode = msg.streamMode;
-        _selfCodecDecoder?.setEnabled(msg.streamMode == streamModeSelfCodec);
+        if (msg.streamMode == streamModeSelfCodec) {
+          _ensureSelfCodecDecoder().then((_) {
+            _selfCodecDecoder?.setEnabled(true);
+          });
+        } else {
+          _selfCodecDecoder?.setEnabled(false);
+        }
         onStreamModeReport?.call(msg.streamMode);
         break;
       case Action.REPORT_RESOLUTION: