HDMI-in/gstreamer won't start from rc.local

VIM4
1

Which system do you use? Android, Ubuntu, OOWOW or others?

Ubuntu server

Which version of system do you use? Please provide the version of the system here:

Ubuntu 24.04 LTS Linux 5.15.119

Please describe your issue below:

The hdmi-in gstreamer example only works if started from a logged in tty.
It fails if I start it from rc.local or systemd - producing empty video.

exec gst-launch-1.0 \
	v4l2src device=/dev/video71 io-mode=dmabuf \
	! video/x-raw,width=1920,height=1080,framerate=30/1,format=NV12 \
	! amlvenc gop=0 bitrate=5000 ! video/x-h264,profile=high \
	! h264parse ! rtph264pay config-interval=1 mtu=1208 \
	! "application/x-rtp, payload=(int)96, ssrc=(uint)555555" \
	!  udpsink host=127.0.0.1 port=${1}

Post a console log of your issue below:


No log or error messages I have seen.
2

Hello @steely-glint

@ivan.li will help you later.

1 Like
4

@steely-glint

Can you provide detailed steps?

5

@ivan.li hi, Sure, here are my steps…

I plugged the HDMI out of a VIM4 into the hdmiin on the same device
logged in over ssh and ran the example.

(VIM4 HDMI Input for 5.15 Kernel [Khadas Docs])

It works.

But I can’t autostart it.
I created a file

khadas@WeightOfTheWheel:~$ cat testhdmi.sh 
#!/bin/sh 

nohup gst-launch-1.0 v4l2src device=/dev/video71 io-mode=dmabuf num-buffers=300 ! video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1,interlace-mode=interleaved ! amlvenc ! h264parse ! qtmux ! filesink location=/tmp/test71.mp4 > /tmp/gst.log &

and added this to the end of /etc/rc.local:

su - khadas -c "/home/khadas/testhdmi.sh"

When I power cycle the gstreamer never completes.

    PID TTY      STAT   TIME COMMAND
   1130 ?        Ss     0:00 /usr/lib/systemd/systemd --user
   1131 ?        S      0:00 (sd-pam)
   1144 ?        Sl     0:00 gst-launch-1.0 v4l2src device=/dev/video71 io-mode=
   1161 ?        Sl     0:00 hdmictrl
   1216 tty1     S+     0:00 -bash
   1269 ?        S      0:01 sshd: khadas@pts/0
   1270 pts/0    Ss     0:00 -bash
   1329 pts/0    R+     0:00 ps -x

The log file contains:

khadas@WeightOfTheWheel:~$ cat /tmp/gst.log 
Setting pipeline to PAUSED ...
khadas      1158  0.0  0.0   2380   816 ?        S    15:30   0:00 sh -c -- ps -aux | grep hdmictrl
khadas      1160  0.0  0.0   6140  2004 ?        S    15:30   0:00 grep hdmictrl
unix  2      [ ACC ]     STREAM     LISTENING     23090    /tmp/hdmi-rx0
unix  3      [ ]         STREAM     CONNECTED     23091    /tmp/hdmi-rx0
khadas@WeightOfTheWheel:~$

I think it wants a controlling terminal or something - wrapping it in screen(1) doesn’t help though.

Can you help please?

Thanks.

Tim

6

Hello @steely-glint
Please use systemd service to manage script startup.

systemd service file example:

[Unit]
Description=testhdmi.sh
After=network.target

[Service]
User=khadas
ExecStart=/home/khadas/testhdmi.sh
Restart=on-failure
RestartSec=30

[Install]
WantedBy=multi-user.target


systemctl enable testhdmi.service
systemctl start testhdmi.service
systemctl status testhdmi.service
7

I tweaked the script to remove the nohup and the & so it now looks like this:

khadas@WeightOfTheWheel:~$ cat testhdmi.sh 
#!/bin/sh 
rm -f /tmp/test71.mp4
rm -f /tmp/gst.log

gst-launch-1.0 v4l2src device=/dev/video71 io-mode=dmabuf num-buffers=300 ! video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1,interlace-mode=interleaved ! amlvenc ! h264parse ! qtmux ! filesink location=/tmp/test71.mp4 > /tmp/gst.log  2>&1

And added your systemd service file to /etc/systemd/system/testhdmi.service
Same result. The gstreamer never outputs a frame and remains PAUSED.

khadas@WeightOfTheWheel:~$ cat /tmp/gst.log
Setting pipeline to PAUSED ...
[2024-09-27 09:42:14]  DEBUG  [amlv4l2src hdmisrc.c:102:hdmi_src_initialize]enter
khadas      1632  0.0  0.0   2380   816 ?        S    09:42   0:00 sh -c -- ps -aux | grep hdmictrl
khadas      1634  0.0  0.0   6140  2008 ?        S    09:42   0:00 grep hdmictrl
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmisrc.c:68:hdmi_src_obtain_devname]enter
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmisrc.c:79:hdmi_src_obtain_devname]hdmi_src_obtain_devname, pid=1635
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmisrc.c:87:hdmi_src_obtain_devname]hdmi_src_obtain_devname end, pid=1635
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmisrc.c:79:hdmi_src_obtain_devname]hdmi_src_obtain_devname, pid=0
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmisrc.c:83:hdmi_src_obtain_devname]ready to execl /usr/bin/hdmictrl, pid=0
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:304:main]enter, prepare enter hdmi_rx_svctx_init
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:256:hdmi_rx_svctx_init]enter
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:264:hdmi_rx_svctx_init]prepare get the GetInstance
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:271:hdmi_rx_svctx_init]go hdmi_rx_svctx_perform_connect
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:202:hdmi_rx_svctx_perform_connect]enter
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:229:hdmi_rx_svctx_perform_connect][64285336]UNIX domain socket (/tmp/hdmi-rx0) bound
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:238:hdmi_rx_svctx_perform_connect][64309252]Accepting connections,get the client_unix_len: 110
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src common/common.c:70:udp_sock_create][64304044][/tmp/hdmi-rx0] start connect
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmisrc.c:97:hdmi_src_obtain_devname]exit
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmisrc.c:109:hdmi_src_initialize]send_buffer:fd:9 buf:connect
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmisrc.c:112:hdmi_src_initialize]exit
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmisrc.c:138:hdmi_src_start]enter
unix  2      [ ACC ]     STREAM     LISTENING     33869    /tmp/hdmi-rx0
unix  3      [ ]         STREAM     CONNECTED     33870    /tmp/hdmi-rx0
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:248:hdmi_rx_svctx_perform_connect]g_t_svctx prepare get the connect_socker_fd 10
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:251:hdmi_rx_svctx_perform_connect]exit
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:278:hdmi_rx_svctx_init]exit
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:311:main]prepare enter setTvEventCallback
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:314:main]prepare enter process_socket_thread
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:139:process_socket_thread]enter
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:144:process_socket_thread]hdmirxsrc is (null)
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:148:process_socket_thread]HDMISRC is hdmi1
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:165:process_socket_thread]e_currentsource = 5
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:169:process_socket_thread]loop wait recv cmd
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:171:process_socket_thread]recv_buffer = connect 
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:172:process_socket_thread]r = 32 errno = 0
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:183:process_socket_thread]Enter connect_hdmi
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:186:process_socket_thread]Exit connect_hdmi
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:189:process_socket_thread]startv is ok
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:169:process_socket_thread]loop wait recv cmd
[2024-09-27 09:42:15]  DEBUG  [amlv4l2src hdmictrl.c:117:TvEventCallback]source: 5, signalFmt: 0, transFmt: 0, status: 1, isDVI: 0, Hdrinfo: 65792d

khadas@WeightOfTheWheel:~$ ls -l /tmp/test71.mp4 
-rw-r--r-- 1 khadas khadas 0 Sep 27 09:42 /tmp/test71.mp4

If I run the gstreamer by hand in a ssh session it works.

Thanks.

Tim.

8

Hello @steely-glint
This issue is being analyzed and will be updated here later.

9

Hi @ivan.li , yes, HDMI is connected to a 1080p (non hdcp) device.
The script works when run by hand from a ssh connection or on the console, but does not work when started from systemd or rc.local .