GStreamer and UDP broadcast issues on iMX6 board

[eschnou]

Hello all,

I'm attempting to broadcast a stream over UDP with Gstreamer on an iMX6 board (IMX6Q). When I do unicast it works great, but as soon as I try to do it towards a UDP broadcast address the video gets choppy and the board unresponsive. I've tried a similar pipeline from a laptop and don't have issues.

In order to reproduce this problem:

1. On the iMX6 board, run the following pipeline:

gst-launch imxv4l2src capture-mode=0 ! vpuenc codec=6 ! rtph264pay ! udpsink host=255.255.255.255 port=5000

2. On the receiving end, run the following pipeline:

gst-launch udpsrc port=5000 ! application/x-rtp, payload=96 ! rtpjitterbuffer ! rtph264depay ! avdec_h264 ! xvimagesink

- I've tested both with ethernet and wifi and had similar issues

- Same issue with local net broadcast (255.255.255.255) and 192.168.5.255

- I'm running with a Yocto Dizzy with kernel 3.14.28

Is there an issue with UDP broadcast at the iMX level ?

Any configuration settings or kernel options I'm missing ?

Thank you !

Laurent

[joanxie]

I have tested udp on my board successfully, the command as below:

gst-launch-1.0 udpsrc do-timestamp=false uri=udp://192.168.0.255:10000 caps="video/mpegts" ! aiurdemux streaming-latency=400 name=d d. ! queue ! vpudec ! queue ! overlaysink sync=true d. ! queue ! beepdec ! pulsesink sync=true

I use vlc player, the boardcase use 192.168.0.255

[世浩李]

Hi,

     I have another problem.I followed the i.MX_Linux_User's_Guide.pdf  and have succeeded to  transfer video between two iMX6 board using RTSP. However, there is a terrible time delay about 3 senconds between the client (board worked with the camera) and the host (board worked as the display). I hava no idea why there is such a time delay and could you give some advise ?Thank you!

Keerecles

[世浩李]

Hello,

     Recently, I have also tried to use udpsrc and udpsink on the iMX6 board. In my case , I launched my sending like this,

           gst-launch-1.0 imxv4l2src ! vpuenc ! rtph264pay ! udpsink host=192.163.8.101 port=5000

     the command of my recieving which is based android smart phone, is like this,

           gst_parse_launch("udpsrc uri=udp://192.168.8.100:5000! autovideosink ", &error)

     The problem is that the sending work well, but the recieving cannot read the data .

     I wonder if there is some issue about video transport based on gstreamer framework between iMX6 and android phone.

     Thanks !

     Keerecles

[eschnou]

Thank you for looking into this. My problem is not when receiving but when sending. Can you do a test using udpsink towards a broadcast address ? For example, can you try my pipeline ?

Just launching this on the board and you should see a major slowdown/freeze of the board:

gst-launch imxv4l2src capture-mode=0 ! vpuenc codec=6 ! rtph264pay ! udpsink host=255.255.255.255 port=5000

Thanks,

Laurent

[joanxie]

I can play the video from mx6q board using the commads as below, I used L4.1.1 bsp

linux side:

gst-launch mfw_v4lsrc fps-n=30 ! vpuenc codec=6 ! queue ! rtph264pay ! udpsink host=192.168.0.105 port=5000 –v

pc side:

open the attached H264.sdp file using VLC. Then you can find the picture from camera on mx6 board, pls don’t forget to load camera module

[eschnou]

Hello,

My problem is with UDP broadcast. It works fine with regular IP address, but my board freezes when using a broadcast IP address. Please try this one:

gst-launch mfw_v4lsrc fps-n=30 ! vpuenc codec=6 ! queue ! rtph264pay ! udpsink host=192.168.0.255 port=5000 –v

It seems the imx board has issue dealing with UDP broadcast over wifi.

Thank you,

Laurent