VO Mix Order Demo#

Overview#

This sample demonstrates how to use the K230 VO (Video Output) module to compose and order multiple video channels on one display. This is commonly used in multi-camera monitoring and picture-in-picture scenarios.

Functional Description#

VO Mix-Order Functions#

This sample demonstrates the following VO mix-order capabilities:

multiple video inputs
mixed display of multiple channels
picture-in-picture layouts
layer priority management
per-channel display region configuration

Supported Functions#

multi-channel input
multiple mix modes
scaling support
adjustable display position

Source Location#

Demo source path: src/rtsmart/examples/mpp/sample_vo_mix_order

Usage#

Build Method#

In the K230 RTOS SDK root directory, run make menuconfig, enable the VO mix-order sample, then rebuild the firmware.

Run Example#

./sample_vo_mix_order

Expected Result#

After running, the sample will:

initialize the VO module
configure multiple video input channels
set the mix-order parameters
start mixed display output
support dynamic changes to channel order and position

Example output:

VO Mix Order Demo
===================

Initializing VO module...
VO initialized successfully

Configuring video mix...
Channel 0: Main video, 1920x1080, Full screen
Channel 1: Sub video 1, 640x480, Position(100,100)
Channel 2: Sub video 2, 640x480, Position(1200,100)
Channel 3: Sub video 3, 640x480, Position(100,600)

Starting video mix...
Video mix started!

Display info:
Main: 1920x1080 @ 30fps
Sub1: 640x480 @ 30fps
Sub2: 640x480 @ 30fps
Sub3: 640x480 @ 30fps

Use keys to adjust video order:
[1] Move sub1 forward
[2] Move sub1 backward
[3] Move sub2 forward
[4] Move sub2 backward
...
[Q] Quit

Press Ctrl+C to exit.

Tip

VO mix-order can be used for multi-camera monitoring and picture-in-picture applications. For VO APIs, refer to Display Output API.