The "USB Camera" application empowers Android devices to interface with USB webcams or video capture cards via USB-OTG, enabling a range of functionalities including video recording, snapshot capture, and transformation into a wireless IP camera for security monitoring. This is achieved through built-in RTSP and HTTP servers, complete with bi-directional audio support accessible via a browser or dedicated "IP Camera" application. The app supports a variety of devices, encompassing UVC webcams with microphone or external USB audio input, UVC video grabbers capable of up to 4K resolution via HDMI, Windows Hello Cameras, IR Cameras, and specific non-UVC devices such as the Geek szitman supercamera. It extends compatibility to various EasyCap devices incorporating chipsets like UTV007, HTV600, HTV800, STK1160, SAA7113/GM7113, AC97, EM2860, SMI2021, ES7240, and CS5340. To ensure optimal performance, the application recommends utilizing a high-quality OTG cable and verifying adequate power supply. Certain devices, for example, Elgato Cam link and ezcap Video Grabber, might necessitate a bridge HUB to amplify USB signals. The application leverages hardware capabilities for advanced video encoding, requiring Android 5.0 or later for HEVC video recording and streaming, and Android 10 or later for AV1 video streaming, contingent on device codec support. The Pro version of the application unlocks additional features, enhancing the user experience by removing advertisements and providing access to advanced settings. The application's versatility is further highlighted by its ability to blend USB audio with a built-in microphone or system audio output, and to overlay built-in camera or screen video onto the external camera video feed, broadening its potential applications in diverse scenarios. It seamlessly integrates with external audio sources, providing users with a comprehensive audio-visual solution for their Android devices. The application's robust feature set transforms Android devices into powerful tools for video capture, security monitoring, and live broadcasting, catering to a wide range of user needs and preferences.

The "USB Camera" app extends its functionality to live media broadcasting by enabling users to push video and audio to RTMP/SRT live media servers over network connections. The application supports both the rtmps security protocol and the SRT protocol, enhancing the security and reliability of live streaming. Moreover, it allows simultaneous streaming to multiple media servers, increasing the reach and distribution of live broadcasts. It is designed to harness advanced video codecs, offering support for HEVC/AV1 over RTMP, which is compatible with platforms like YouTube Live, thereby ensuring high-quality live streaming experiences. The app further enriches the viewing experience through Side by Side (SBS) view support, enabling compatibility with FPV goggles for immersive virtual reality applications. Adding contextual data to video recordings is also a key feature, as the app can embed timestamps, GPS coordinates, speed information, and other relevant details directly onto the video frames. Users can leverage their headsets or Bluetooth headsets to capture snapshots and record videos, thereby offering flexibility in control and operation. Additionally, it supports the snapshot button found on many webcams, providing a convenient and familiar way to capture still images. The application incorporates loop-recording functionality, which is particularly useful for continuous recording scenarios. Users can configure auto-segmentation during recording and enable auto-deletion of older video archives when storage space is limited. This feature transforms the "USB Camera" app into a practical dash cam solution for vehicles, ensuring continuous recording without manual intervention. The app's design prioritizes seamless transitions between foreground and background operation, allowing users to switch modes without interrupting ongoing recordings. By pressing the 'Enter background' option in the menu, users can continue recording even when using other applications or locking their devices, providing uninterrupted video capture capabilities. This background recording feature ensures that important moments are never missed, regardless of user activity.

Beyond its core recording and streaming capabilities, the "USB Camera" application incorporates advanced features like motion detection-based auto video recording. When motion is detected, the app automatically starts recording video, making it a valuable tool for surveillance and security applications. These recorded videos can then be automatically uploaded to an FTP server, providing a secure and convenient way to store and manage footage. Furthermore, the app can send email notifications to alert users of any detected motion, ensuring that they are promptly informed of any activity. Bi-directional audio support is also available, enhancing the app's utility for interactive communication. This feature requires the installation of the "IP Camera" application, which can be obtained from the Google Play Store. This integration facilitates two-way audio communication, enabling users to not only see but also hear and interact with their environment remotely. It is crucial to note that on Android 9 and above, camera permission is required to grant the application full access to USB video devices, ensuring proper functionality and compatibility. This permission is necessary for the app to fully utilize the capabilities of connected USB cameras and video capture devices. The application operates as a userspace driver, meaning it functions within the app's environment and does not require kernel-level access. This approach ensures stability and security, as it avoids modifying the core Android operating system. However, it also means that the app's functionality is limited to its own environment and cannot be directly utilized by third-party applications, as Android does not permit the installation of kernel drivers. This design choice prioritizes app stability and security while providing a comprehensive and feature-rich experience within the "USB Camera" application itself.