chore: set libcamera:0 as default and refine setup instructions

Author: TzuHuanTai

README.md

@@ -16,31 +16,28 @@
 
 Turn your Raspberry Pi into a low-latency home security camera using the V4L2 DMA hardware encoder and WebRTC. [[demo video](https://www.youtube.com/watch?v=JZ5bcSAsXog)]
 
-- Pure P2P-based camera allows video playback and download without a media server.
+- Supports real-time adjustment of camera parameters and video recording download.
 - Support [multiple users](doc/pi_4b_users_demo.gif) for simultaneous live streaming.
-- Support signaling via [WHEP](https://www.ietf.org/archive/id/draft-ietf-wish-whep-02.html) or MQTT.
-
-# How to use
-
-To set up the environment, please check out the [tutorial video](https://youtu.be/g5Npb6DsO-0) or the steps below.
-
-* Download and run the binary file from [Releases](https://github.com/TzuHuanTai/RaspberryPi_WebRTC/releases).
-* Set up the network configuration and create a new client using one of the following options:
+- Support signaling 
 
   **MQTT**
     * [PiCamera.js](https://www.npmjs.com/package/picamera.js)
-    * [Pi Camera App](https://github.com/TzuHuanTai/Pi-Camera) (Android)
-    * [Pi Camera Web](https://picamera.live)
+    * [Pi Camera App](https://github.com/TzuHuanTai/Pi-Camera) *(for development and testing)*
+    * [Pi Camera Web](https://picamera.live) *(for development and testing)*
 
-  **WHEP**
+  **[WHEP](https://www.ietf.org/archive/id/draft-ietf-wish-whep-02.html)**
     * [Home Assistant](https://www.home-assistant.io)
     * [eyevinn/webrtc-player](https://www.npmjs.com/package/@eyevinn/webrtc-player)
 
+# Quick Start
+
+To set up the environment, please check out the [tutorial video](https://youtu.be/g5Npb6DsO-0) or the steps below.
+
 ## Hardware Requirements
 
 <img src="https://assets.raspberrypi.com/static/51035ec4c2f8f630b3d26c32e90c93f1/2b8d7/zero2-hero.webp" height="96">
 
-* Raspberry Pi (Zero 2W/3/3B+/4B/5).
+* Raspberry Pi (Zero 2W/3B/3B+/4B/5).
 * CSI or USB Camera Module.
 
 ## Environment Setup
@@ -58,22 +55,23 @@ Use the [Raspberry Pi Imager](https://www.raspberrypi.com/software/) to install
 
 </details>
 
-### 2. Install essential libraries
+### 2. Install Dependencies
 
 ```bash
 sudo apt install libmosquitto1 pulseaudio libavformat59 libswscale6
 ```
 
-### 3. Download and unzip the binary file
+### 3. Download & Unpack
 
+Prepare the binary file from [Releases](https://github.com/TzuHuanTai/RaspberryPi_WebRTC/releases).
 ```bash
 wget https://github.com/TzuHuanTai/RaspberryPi_WebRTC/releases/latest/download/pi_webrtc-v1.0.5_MQTT_raspios-bookworm-arm64.tar.gz
 tar -xzf pi_webrtc-v1.0.5_MQTT_raspios-bookworm-arm64.tar.gz
 ```
 
-### 4. Setup MQTT
+### 4. Set Up MQTT
 
-An MQTT server is required for communication between devices. For remote access, free cloud options include [HiveMQ](https://www.hivemq.com) and [EMQX](https://www.emqx.com/en).
+You can use a free cloud MQTT service like  [HiveMQ](https://www.hivemq.com) or [EMQX](https://www.emqx.com/en), or set up your own self-hosted broker.
 
 <details>
   <summary>
@@ -90,21 +88,22 @@ An MQTT server is required for communication between devices. For remote access,
 * Run the command based on your network settings and `UID` on the Raspberry Pi:
     ```bash
     ./pi_webrtc \
-        --use_libcamera \
+        --camera=libcamera:0 \
         --fps=30 \
         --width=1280 \
         --height=960 \
-        --hw_accel \
-        --no_audio \
         --mqtt_host=your.mqtt.cloud \
         --mqtt_port=8883 \
         --mqtt_username=hakunamatata \
         --mqtt_password=Wonderful \
-        --uid=your-custom-uid
+        --uid=your-custom-uid \
+        --no_audio \
+        --hw_accel # Only Pi Zero 2W, 3B, 4B support hw encoding
     ```
 
 > [!IMPORTANT]
-> The `--hw_accel` flag is used for Pi Zero 2W, 3, 3B+, and 4B. For Pi 5 or other SBCs without a hardware encoder, run this command in software encoding mode by removing the `--hw_accel` flag.
+> Use `--hw_accel` for Pi Zero 2W, 3B, 3B+, and 4B. Remove for Pi 5 or devices without hardware encoding.
+
 * Go to the Live page to enjoy real-time streaming!
 
 <p align=center>
@@ -113,7 +112,7 @@ An MQTT server is required for communication between devices. For remote access,
 
 # [Advance](https://github.com/TzuHuanTai/RaspberryPi_WebRTC/wiki/Advanced-Settings)
 
-- [Using the Legacy V4L2 Driver](https://github.com/TzuHuanTai/RaspberryPi-WebRTC/wiki/Advanced-Settings#using-the-legacy-v4l2-driver) for usb camera
+- [Using the V4L2 Driver](https://github.com/TzuHuanTai/RaspberryPi-WebRTC/wiki/Advanced-Settings#using-the-legacy-v4l2-driver) for usb camera
 - [Run as Linux Service](https://github.com/TzuHuanTai/RaspberryPi-WebRTC/wiki/Advanced-Settings#run-as-linux-service)
 - [Recording](https://github.com/TzuHuanTai/RaspberryPi-WebRTC/wiki/Advanced-Settings#recording)
 - [Two-way communication](https://github.com/TzuHuanTai/RaspberryPi-WebRTC/wiki/Advanced-Settings#two-way-communication)