topic Re: Display error on imx8xqxp mek in i.MX Processors

Display error on imx8xqxp mek

Ale2 — Mon, 21 Dec 2020 17:54:01 GMT

Some thing wrong happens when I play rtsp stream by gst on imx8qxp board:

1.jpg

But it works fine on imx8m board. Here is the log:

2.png

Same result when I use "rtspsrc location=rtsp://192.168.1.19:554/1/h264major latency=200 ! rtph264depay ! h264parse ! queue ! vpudec ! appsink sync=false" in my app.

Any clue about this?

Thanks,

Ale

Re: Display error on imx8xqxp mek

Bio_TICFSL — Tue, 22 Dec 2020 14:10:59 GMT

Hello Ale2,

Make sure that both are playing the latest linux bsp, there is A53 in MX8M and A35 in MX8QX, but should not difference in display mode.

with the

gst-inspect-1.0 v4l2h264dec

you can see the difference between both processor on encoding time. Also Try the file

gst-launch-1.0 playbin uri=file:/run/media/sda1/big_buck_bunny.mp4 video-sink="imxvideoconvert_g2d ! queue ! autovideosink"

To avoid display issues.

Regards

Re: Display error on imx8xqxp mek

Ale2 — Wed, 23 Dec 2020 03:42:18 GMT

Hi,

Thanks for your reply! We expect to get data in NV12 format. In this case, we do not want to use imxvideoconvert_g2d to do further processing.

We write codes in Qt like:

VideoCapture cap；
cap.open( "rtspsrc location=rtsp://admin:admin@192.168.1.42:554/1/0.sdp ! rtph264depay ! h264parse ! queue ! vpudec! queue ! appsink sync=false", CAP_GSTREAMER)

It works well in imx8m. Then we want to port the app to imx8x. We modify the code to this:

VideoCapture cap；
cap.open( "rtspsrc location=rtsp://admin:admin@192.168.1.42:554/1/0.sdp ! rtph264depay ! h264parse ! queue ! v4l2h264dec ! queue ! appsink sync=false", CAP_GSTREAMER)

And the display error occurs in imx8x.

In IMX8GStreamerGuide.pdf, It is ok to parse rtspsrc without imxvideoconvert_g2d. Is there something we should do in this process?3.png