Skip to main content
QCS6490Stable

vhdr=3

Activation Flag

Linear ↔ SHDR

Seamless Switch

Pre-initialized

Low Latency
Platform Scope:
This feature is applicable for QCS6490 only.

​
01 · What Is It?

This feature enables on-the-fly switching between Linear and SHDR v2 mode pipelines without terminating the active camera session. Key architectural benefits include:
  • Session Continuity: Prevents video session interruption during light-level (lux) fluctuations.
  • Latency Optimization: Pipelines are pre-initialized during session creation to minimize switch overhead.
  • Resource Management: Automatically releases and re-acquires hardware blocks (Sensor, IFE, IPE) during the reconfiguration phase.
This feature works only for SHDR v2 and Linear mode pipelines.

​
02 · Verification Setup

Connect to the device console using SSH. See How To SSH? for instructions.
1

Initialize Log Collection

Run the following command on the device to monitor runtime events:
Log Collection

​
03 · Feature Validation

Use vhdr=3 in a GST command to enable this feature. To enable the feature and toggle between Linear and SHDR modes:
1

Execute Metadata Application

Run the gst-camera-metadata-example application to support runtime vendor tag configuration.
GStreamer (Auto Mode Switch)
2

Transition to READY

In the application, select (1) READY.
3

Initialize PLAYING State

Select (3) PLAYING. The camera starts in linear mode.
4

Open Metadata Menu

Select (4) META. The following menu is shown:
Metadata Root Menu
5

Select Video Category

Select (1) video-metadata. The following menu is shown:
Video Metadata Menu
6

Invoke Tag Modification

Select (5) Set a tag.
7

Define Vendor Tag

A prompt appears to enter the section name and tag name separated by spaces without quotes. Enter: org.quic.camera.videoHDRmode modeType
8

Trigger Mode Switch

A prompt appears to set the value. Enter 1 to switch to SHDR mode.
To toggle between Linear and SHDR modes, repeat this process and enter 1 (SHDR mode) and 0 (Linear mode) as needed.
To close the camera, select (q) QUIT or press CTRL + C.

​
04 · Log Verification

Verify the pipeline reconfiguration by checking the following log signatures:

​
Linear Mode Selection

CamX Status (Linear)

​
SHDR Mode Selection

CamX Status (SHDR)