Imx6q dual-display issue

[weikeng-jimmy]

Hi sir:

I play two different 1080P video and two different devices output at the same time.

Boot command:

setenv bootargs_mmc 'setenv bootargs ${bootargs} root=/dev/mmcblk1p1 init=/init rootwait video=mxcfb0:dev=hdmi,1920x1080M@60,

if=RGB24 video=mxcfb1:dev=lcd,LCD-1920x1080,if=RGB24 dmfc=3'

Play 1080P high quality video by gst-launch video by

gst-launch playbin2 uri=file:////mnt/disk/Girl1.avi video-sink="mfw_v4lsink device=/dev/video16" audio-sink="alsasink device=plughw:0" &

gst-launch playbin2 uri=file:////mnt/disk/snsd.mp4 video-sink="mfw_v4lsink device=/dev/video18" audio-sink="alsasink device=plughw:1" &

I can see color bar at top of screen as attach files.

I play low quality file and it's works fine.

Is it i.mx6Q limitation ?

[qiang_li-mpu_se]

For dual display mode, you should not use "dmfc=3", "dmfc=3" means all DMFC fifo will be used for DP, the main display. It should be used for only single display mode.

[weikeng-jimmy]

The strange color bar still exist when not use "dmfc=3.

Thanks!

[timothybean]

Were you able to figure out the problem? I am having similar issues.

Thanks

Tim

[LeonardoSandova]

Hi,

that is not the expected behaviour. Can you try this pipeline:

gst-launch -v videotestsrc ! 'video/x-raw-yuv, format=(fourcc)NV12, width=(int)1920, height=(int)1080, framerate=(fraction)10/1' ! mfw_v4lsink

Do you see the bar in this case?

[weikeng-jimmy]

Hi,

I had tried this solution.

It worked fine. Strange color bar did not exist.

In addition, I found that the display was normal if frame buffer console option was disabled.

And video16 change to video17 can work fine.

It's framebuffer issue?

[WangZening · Accepted solution]

The video16 is for GUI, so if you put the video on it also, there will be some artifacts since there are 2 sources (GUI and video) updating the frame buffer.

[weikeng-jimmy]

You mean the video must setting to 17 if used dual-display. But not have any document explain it.

[johnturnur]

Have you tried with Android?

What are the steps to test for dual display on android?

I have tried but not find any solution for this..

[weikeng-jimmy]

I only tried to test on Linux base.

Thanks!