Prevent build from falling back to system libs

Ensure that if a file or function is not found, the build does not
attempt to use system libraries. Falling back could result in using
libraries that are incompatible due to wrong versions or features.

PR #6671 <https://github.com/Genymobile/scrcpy/pull/6671>

release/build_linux.sh

@@ -22,9 +22,12 @@ app/deps/libusb.sh linux native static
 DEPS_INSTALL_DIR="$PWD/app/deps/work/install/linux-native-static"
 ADB_INSTALL_DIR="$PWD/app/deps/work/install/adb-linux"
 
+# Never fall back to system libs
+unset PKG_CONFIG_PATH
+export PKG_CONFIG_LIBDIR="$DEPS_INSTALL_DIR/lib/pkgconfig"
+
 rm -rf "$LINUX_BUILD_DIR"
 meson setup "$LINUX_BUILD_DIR" \
-    --pkg-config-path="$DEPS_INSTALL_DIR/lib/pkgconfig" \
     -Dc_args="-I$DEPS_INSTALL_DIR/include" \
     -Dc_link_args="-L$DEPS_INSTALL_DIR/lib" \
     --buildtype=release \

release/build_macos.sh

@@ -22,9 +22,12 @@ app/deps/libusb.sh macos native static
 DEPS_INSTALL_DIR="$PWD/app/deps/work/install/macos-native-static"
 ADB_INSTALL_DIR="$PWD/app/deps/work/install/adb-macos"
 
+# Never fall back to system libs
+unset PKG_CONFIG_PATH
+export PKG_CONFIG_LIBDIR="$DEPS_INSTALL_DIR/lib/pkgconfig"
+
 rm -rf "$MACOS_BUILD_DIR"
 meson setup "$MACOS_BUILD_DIR" \
-    --pkg-config-path="$DEPS_INSTALL_DIR/lib/pkgconfig" \
     -Dc_args="-I$DEPS_INSTALL_DIR/include" \
     -Dc_link_args="-L$DEPS_INSTALL_DIR/lib" \
     --buildtype=release \

release/build_windows.sh

@@ -29,9 +29,12 @@ app/deps/libusb.sh $WINXX cross shared
 DEPS_INSTALL_DIR="$PWD/app/deps/work/install/$WINXX-cross-shared"
 ADB_INSTALL_DIR="$PWD/app/deps/work/install/adb-windows"
 
+# Never fall back to system libs
+unset PKG_CONFIG_PATH
+export PKG_CONFIG_LIBDIR="$DEPS_INSTALL_DIR/lib/pkgconfig"
+
 rm -rf "$WINXX_BUILD_DIR"
 meson setup "$WINXX_BUILD_DIR" \
-    --pkg-config-path="$DEPS_INSTALL_DIR/lib/pkgconfig" \
     -Dc_args="-I$DEPS_INSTALL_DIR/include" \
     -Dc_link_args="-L$DEPS_INSTALL_DIR/lib" \
     --cross-file=cross_$WINXX.txt \

server/src/main/java/com/genymobile/scrcpy/video/SurfaceEncoder.java

@@ -264,6 +264,10 @@ public class SurfaceEncoder implements AsyncProcessor {
         format.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, DEFAULT_I_FRAME_INTERVAL);
         // display the very first frame, and recover from bad quality when no new frames
         format.setLong(MediaFormat.KEY_REPEAT_PREVIOUS_FRAME_AFTER, REPEAT_FRAME_DELAY_US); // µs
+        // real-time priority
+        format.setInteger(MediaFormat.KEY_PRIORITY, 0);
+        // output 1 frame as soon as 1 frame is queued
+        format.setInteger(MediaFormat.KEY_LATENCY, 1);
         if (maxFps > 0) {
             // The key existed privately before Android 10:
             // <https://android.googlesource.com/platform/frameworks/base/+/625f0aad9f7a259b6881006ad8710adce57d1384%5E%21/>