Video Playback - VIA Technologies VAB-950 Quick Start Manual

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Use the fastboot.exe to set the display device by using the following commands:

D:\platform-tools>fastboot.exe oem display dsi

D:\platform-tools>fastboot.exe oem display hdmi

Use the following command to check the current display device. In the example below, the current display

device is the LCD panel output.

D:\platform-tools>fastboot.exe getvar all

(bootloader) display: dsi

(bootloader) is-userspace: no

(bootloader) max-download-size: 0x4000000

(bootloader) version: 0.5

all: Done!!

Finished. Total time: 0.009s

Power off the VIA VAB-950 and set the two OS image jumpers (J7 and J5) back to the normal mode setting.

Unplug the Micro USB cable, and then power on the VIA VAB-950.

When the boot process has completed, the LCD panel output will be set as the display device.

Note:

The default display device is HDMI output. After changing the display device, you must restart the VIA VAB-950.

To control the LCD backlight, use the following commands:

root@aiv8385-linux:~# cd /sys/devices/platform/backlight_lcd0/backlight/backlight_lcd0/

root@aiv8385-linux:~# cat max_brightness

root@aiv8385-linux:~# echo 16 > brightness

Note:

There are only 17 levels (0~16) for the LCD backlight control.

3.6 Video Playback

The VIA VAB-950 supports H.265 and H.264 video decoding up to 1080p@30fps/40Mbps.

To playback video, use the following command:

root@aiv8385-linux:~# gst-launch-1.0 playbin flags=0x42 audio-sink="alsasink device=hw:0,28"

video-sink="mtkmdp width=1280 height=640 ! video/x-raw,format=I420 ! mtkwaylandsink"

uri="file:///mnt/test.mp4"

VIA VAB-950 Yocto 3.1 EVK Quick Start Guide

OS image jumpers diagram

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