diff --git a/README.md b/README.md
index db531c61..7f6af3dd 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ Its features include:
 
 ## Requirements
 
-The Android device requires at least API 21 (Android 5.0).
+The Android device requires at least API 19 (Android 4.4).
 
 Make sure you [enable adb debugging][enable-adb] on your device(s).
 
diff --git a/server/build.gradle b/server/build.gradle
index dbc8261f..42387d57 100644
--- a/server/build.gradle
+++ b/server/build.gradle
@@ -4,7 +4,7 @@ android {
     compileSdkVersion 31
     defaultConfig {
         applicationId "com.genymobile.scrcpy"
-        minSdkVersion 21
+        minSdkVersion 19
         targetSdkVersion 31
         versionCode 12400
         versionName "1.24"
diff --git a/server/src/main/java/com/genymobile/scrcpy/ScreenEncoder.java b/server/src/main/java/com/genymobile/scrcpy/ScreenEncoder.java
index e95896d3..f65fd4a0 100644
--- a/server/src/main/java/com/genymobile/scrcpy/ScreenEncoder.java
+++ b/server/src/main/java/com/genymobile/scrcpy/ScreenEncoder.java
@@ -144,9 +144,11 @@ public class ScreenEncoder implements Device.RotationListener {
         return 0;
     }
 
+    @SuppressWarnings("deprecation") // Android API 19 requires to call deprecated methods
     private boolean encode(MediaCodec codec, FileDescriptor fd) throws IOException {
         boolean eof = false;
         MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
+        ByteBuffer[] cachedOutputBuffers = null;
 
         while (!consumeRotationChange() && !eof) {
             int outputBufferId = codec.dequeueOutputBuffer(bufferInfo, -1);
@@ -157,7 +159,15 @@ public class ScreenEncoder implements Device.RotationListener {
                     break;
                 }
                 if (outputBufferId >= 0) {
-                    ByteBuffer codecBuffer = codec.getOutputBuffer(outputBufferId);
+                    ByteBuffer codecBuffer;
+                    if (Build.VERSION.SDK_INT >= 21) {
+                        codecBuffer = codec.getOutputBuffer(outputBufferId);
+                    } else {
+                        if (cachedOutputBuffers == null) {
+                            cachedOutputBuffers = codec.getOutputBuffers();
+                        }
+                        codecBuffer = cachedOutputBuffers[outputBufferId];
+                    }
 
                     if (sendFrameMeta) {
                         writeFrameMeta(fd, bufferInfo, codecBuffer.remaining());
@@ -168,6 +178,8 @@ public class ScreenEncoder implements Device.RotationListener {
                         // If this is not a config packet, then it contains a frame
                         firstFrameSent = true;
                     }
+                } else if (outputBufferId == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) {
+                    cachedOutputBuffers = null;
                 }
             } finally {
                 if (outputBufferId >= 0) {
@@ -201,10 +213,25 @@ public class ScreenEncoder implements Device.RotationListener {
         IO.writeFully(fd, headerBuffer);
     }
 
+    @SuppressWarnings("deprecation") // Android API 19 requires to call deprecated methods
+    private static MediaCodecInfo[] getCodecInfosCompat() {
+        if (Build.VERSION.SDK_INT >= 21) {
+            MediaCodecList list = new MediaCodecList(MediaCodecList.REGULAR_CODECS);
+            return list.getCodecInfos();
+        } else {
+            final int size = MediaCodecList.getCodecCount();
+            final MediaCodecInfo[] infos = new MediaCodecInfo[size];
+            for (int i = 0; i < size; i++) {
+                infos[i] = MediaCodecList.getCodecInfoAt(i);
+            }
+            return infos;
+        }
+    }
+
     private static MediaCodecInfo[] listEncoders() {
         List<MediaCodecInfo> result = new ArrayList<>();
-        MediaCodecList list = new MediaCodecList(MediaCodecList.REGULAR_CODECS);
-        for (MediaCodecInfo codecInfo : list.getCodecInfos()) {
+        MediaCodecInfo[] codecInfos = getCodecInfosCompat();
+        for (MediaCodecInfo codecInfo : codecInfos) {
             if (codecInfo.isEncoder() && Arrays.asList(codecInfo.getSupportedTypes()).contains(MediaFormat.MIMETYPE_VIDEO_AVC)) {
                 result.add(codecInfo);
             }