diff --git a/docs/getting_started/android_archive_library.md b/docs/getting_started/android_archive_library.md
index 0b2c6181b..feeabfd39 100644
--- a/docs/getting_started/android_archive_library.md
+++ b/docs/getting_started/android_archive_library.md
@@ -91,8 +91,8 @@ each project.
     [the label map](https://github.com/google/mediapipe/blob/master/mediapipe/models/face_detection_front_labelmap.txt).
 
     ```bash
-    bazel build -c opt mediapipe/examples/android/src/java/com/google/mediapipe/apps/facedetectiongpu:binary_graph
-    cp bazel-bin/mediapipe/examples/android/src/java/com/google/mediapipe/apps/facedetectiongpu/facedetectiongpu.binarypb /path/to/your/app/src/main/assets/
+    bazel build -c opt mediapipe/mediapipe/graphs/face_detection:mobile_gpu_binary_graph
+    cp bazel-bin/mediapipe/graphs/face_detection/mobile_gpu.binarypb /path/to/your/app/src/main/assets/
     cp mediapipe/models/face_detection_front.tflite /path/to/your/app/src/main/assets/
     cp mediapipe/models/face_detection_front_labelmap.txt /path/to/your/app/src/main/assets/
     ```
@@ -130,7 +130,7 @@ each project.
         implementation 'com.google.code.findbugs:jsr305:3.0.2'
         implementation 'com.google.guava:guava:27.0.1-android'
         implementation 'com.google.guava:guava:27.0.1-android'
-        implementation 'com.google.protobuf:protobuf-java:3.11.4''
+        implementation 'com.google.protobuf:protobuf-java:3.11.4'
         // CameraX core library
         def camerax_version = "1.0.0-alpha06"
         implementation "androidx.camera:camera-core:$camerax_version"
diff --git a/docs/images/mobile/assets_location.png b/docs/images/mobile/assets_location.png
index 573b77f04..9d8ab0469 100644
Binary files a/docs/images/mobile/assets_location.png and b/docs/images/mobile/assets_location.png differ
diff --git a/mediapipe/calculators/util/rect_projection_calculator.cc b/mediapipe/calculators/util/rect_projection_calculator.cc
index a9f7018cf..0b0ec9468 100644
--- a/mediapipe/calculators/util/rect_projection_calculator.cc
+++ b/mediapipe/calculators/util/rect_projection_calculator.cc
@@ -48,6 +48,7 @@ constexpr char kNormReferenceRectTag[] = "NORM_REFERENCE_RECT";
 class RectProjectionCalculator : public CalculatorBase {
  public:
   static ::mediapipe::Status GetContract(CalculatorContract* cc);
+  ::mediapipe::Status Open(CalculatorContext* cc) override;
   ::mediapipe::Status Process(CalculatorContext* cc) override;
 };
 REGISTER_CALCULATOR(RectProjectionCalculator);
@@ -60,6 +61,12 @@ REGISTER_CALCULATOR(RectProjectionCalculator);
   return ::mediapipe::OkStatus();
 }
 
+::mediapipe::Status RectProjectionCalculator::Open(CalculatorContext* cc) {
+  cc->SetOffset(TimestampDiff(0));
+
+  return ::mediapipe::OkStatus();
+}
+
 ::mediapipe::Status RectProjectionCalculator::Process(CalculatorContext* cc) {
   if (cc->Inputs().Tag(kNormRectTag).IsEmpty()) {
     return ::mediapipe::OkStatus();
diff --git a/mediapipe/gpu/gl_scaler_calculator.cc b/mediapipe/gpu/gl_scaler_calculator.cc
index d28cd4cfd..8729f4d8e 100644
--- a/mediapipe/gpu/gl_scaler_calculator.cc
+++ b/mediapipe/gpu/gl_scaler_calculator.cc
@@ -83,6 +83,7 @@ class GlScalerCalculator : public CalculatorBase {
   GlCalculatorHelper helper_;
   int dst_width_ = 0;
   int dst_height_ = 0;
+  float dst_scale_ = -1.f;
   FrameRotation rotation_;
   std::unique_ptr<QuadRenderer> rgb_renderer_;
   std::unique_ptr<QuadRenderer> yuv_renderer_;
@@ -142,6 +143,9 @@ REGISTER_CALCULATOR(GlScalerCalculator);
   if (options.has_output_height()) {
     dst_height_ = options.output_height();
   }
+  if (options.has_output_scale()) {
+    dst_scale_ = options.output_scale();
+  }
   if (options.has_rotation()) {
     rotation_ccw = options.rotation();
   }
@@ -283,8 +287,18 @@ void GlScalerCalculator::GetOutputDimensions(int src_width, int src_height,
   if (dst_width_ > 0 && dst_height_ > 0) {
     *dst_width = dst_width_;
     *dst_height = dst_height_;
-  } else if (rotation_ == FrameRotation::k90 ||
-             rotation_ == FrameRotation::k270) {
+    return;
+  }
+  if (dst_scale_ > 0) {
+    // Scales the destination size, but just uses src size as a temporary for
+    // calculations.
+    src_width = static_cast<int>(src_width * dst_scale_);
+    src_height = static_cast<int>(src_height * dst_scale_);
+    // Round to nearest multiply of 4 for better memory alignment.
+    src_width = ((src_width + 2) >> 2) << 2;
+    src_height = ((src_height + 2) >> 2) << 2;
+  }
+  if (rotation_ == FrameRotation::k90 || rotation_ == FrameRotation::k270) {
     *dst_width = src_height;
     *dst_height = src_width;
   } else {
diff --git a/mediapipe/gpu/gl_scaler_calculator.proto b/mediapipe/gpu/gl_scaler_calculator.proto
index 9a04313cd..99c0d439a 100644
--- a/mediapipe/gpu/gl_scaler_calculator.proto
+++ b/mediapipe/gpu/gl_scaler_calculator.proto
@@ -19,6 +19,7 @@ package mediapipe;
 import "mediapipe/framework/calculator.proto";
 import "mediapipe/gpu/scale_mode.proto";
 
+// Next id: 8.
 message GlScalerCalculatorOptions {
   extend CalculatorOptions {
     optional GlScalerCalculatorOptions ext = 166373014;
@@ -27,6 +28,10 @@ message GlScalerCalculatorOptions {
   // Output dimensions.
   optional int32 output_width = 1;
   optional int32 output_height = 2;
+  // A scale factor for output size, while keeping aspect ratio. It has lower
+  // priority than the above two fields. That is, it is effective only when the
+  // above two fields are unset.
+  optional float output_scale = 7 [default = 1.0];
   // Counterclockwise rotation in degrees. Must be a multiple of 90.
   optional int32 rotation = 3;
   // Flip the output texture vertically. This is applied after rotation.