iMX8QM HDMI RX Gstreamer Command

[prashanthkumar]

Hi,

We are working on iMX8QM custom board with 4.14.78 Kernel BSP release, in which HDMI-RX/HDMI-IN is configured.

We need to overlay, capture & play both audio & video through HDMI-RX.

Can you please suggest the gstreamer commands to overlay, capture & play the videos & audios fir HDMI RX.

Best regards,

Prashanth Kumar K

[prashanthkumar]

Hi,

While overlaying HDMI RX on the HDMI TX screen, board is crashing, the crash log as below ,

root@imx8qmmek:~# gst-launch-1.0 -e v4l2src device=/dev/video3 ! video/x-raw,width=1920,height=1080, framerate=60/1 ! waylandsink
Setting pipeline to PAUSED ...
Pipelin[e  is  l2i1v4e. 1a0n3d1 d8o1es]  nUonta bneleed  PtRoE ROhLLa ..n.dle kernel NULL pointer dereference at virtual address 00000004

r[etti n g2 p1ip4e.l1i1n4e9 4to8 ]P LMAYeINmG  a.b..o
ktN ewi ncfloo:c
 : GstSystemClock
[  214.123911]   Exception class = DABT (current EL), IL = 32 bits
[  214.130656]   SET = 0, FnV = 0
[  214.133733]   EA = 0, S1PTW = 0
[  214.136870] Data abort info:
[  214.140518]   ISV = 0, ISS = 0x00000006
[  214.144363]   CM = 0, WnR = 0
[  214.147334] user pgtable: 4k pages, 48-bit VAs, pgd = ffff8008ea6bf000
[  214.154691] [0000000000000004] *pgd=000000096a7c0003, *pud=00000009736a4003, *pmd=0000000000000000
[  214.164471] Internal error: Oops: 96000006 [#1] PREEMPT SMP
[  214.170040] Modules linked in:
[  214.173095] CPU: 5 PID: 4029 Comm: v4l2src0:src Not tainted 4.14.78 #75
[  214.179708] Hardware name: iW-RainboW-G27D-i.MX8QM_SMARC (DT)
[  214.185451] task: ffff8008f2fb6c00 task.stack: ffff00002b990000
[  214.191378] PC is at mxc_hdmi_enum_framesizes+0x20/0x40
[  214.196600] LR is at mxc_isi_cap_enum_framesizes+0xb0/0x168
[  214.202166] pc : [<ffff0000089fcde0>] lr : [<ffff0000089efac0>] pstate: 80000145
[  214.209558] sp : ffff00002b993bb0
[  214.212869] x29: ffff00002b993bb0 x28: ffff8008f3046900
[  214.218177] x27: 0000000000000000 x26: ffff8008f20aa910
[  214.223485] x25: 0000000000000000 x24: ffff000009669678
[  214.228793] x23: 000000000000004a x22: ffff00002b993d30
[  214.234100] x21: ffff8008f20aa018 x20: 0000000000000001
[  214.239409] x19: ffff00002b993d30 x18: 0000ffff83f22a70
[  214.244717] x17: 0000ffff83f36268 x16: ffff00000822a3d0
[  214.250025] x15: 0000000000000000 x14: 000000000000001f
[  214.255333] x13: 0000000000000000 x12: 0000ffff74004ce0
[  214.260641] x11: 0000000000000000 x10: 0000000000000000
[  214.265949] x9 : 0000000000000200 x8 : ffff00002b993d5c
[  214.271257] x7 : 0000000056595559 x6 : 0000000056595559
[  214.276565] x5 : ffff00002b993d34 x4 : ffff8008f7fde0c0
[  214.281873] x3 : 0000000000000000 x2 : ffff00002b993be0
[  214.287181] x1 : ffff8008f7fde018 x0 : 0000000000000000
[  214.292490] Process v4l2src0:src (pid: 4029, stack limit = 0xffff00002b990000)
[  214.299710] Call trace:
[  214.302151] Exception stack(0xffff00002b993a70 to 0xffff00002b993bb0)
[  214.308588] 3a60:                                   0000000000000000 ffff8008f7fde018
[  214.316416] 3a80: ffff00002b993be0 0000000000000000 ffff8008f7fde0c0 ffff00002b993d34
[  214.324243] 3aa0: 0000000056595559 0000000056595559 ffff00002b993d5c 0000000000000200
[  214.332071] 3ac0: 0000000000000000 0000000000000000 0000ffff74004ce0 0000000000000000
[  214.339898] 3ae0: 000000000000001f 0000000000000000 ffff00000822a3d0 0000ffff83f36268
[  214.347725] 3b00: 0000ffff83f22a70 ffff00002b993d30 0000000000000001 ffff8008f20aa018
[  214.355553] 3b20: ffff00002b993d30 000000000000004a ffff000009669678 0000000000000000
[  214.363380] 3b40: ffff8008f20aa910 0000000000000000 ffff8008f3046900 ffff00002b993bb0
[  214.371208] 3b60: ffff0000089efac0 ffff00002b993bb0 ffff0000089fcde0 0000000080000145
[  214.379035] 3b80: ffff00002b993bb0 ffff0000089efa94 0000ffffffffffff 0000000000000001
[  214.386862] 3ba0: ffff00002b993bb0 ffff0000089fcde0
[  214.391738] [<ffff0000089fcde0>] mxc_hdmi_enum_framesizes+0x20/0x40
[  214.398002] [<ffff0000089b7544>] __video_do_ioctl+0x204/0x2f8
[  214.403743] [<ffff0000089b7064>] video_usercopy+0x1ec/0x4a8
[  214.409312] [<ffff0000089b7334>] video_ioctl2+0x14/0x20
[  214.414532] [<ffff0000089b3444>] v4l2_ioctl+0x7c/0x198
[  214.419669] [<ffff000008229b9c>] do_vfs_ioctl+0xa4/0x8d8
[  214.424975] [<ffff00000822a44c>] SyS_ioctl+0x7c/0x98
[  214.429935] Exception stack(0xffff00002b993ec0 to 0xffff00002b994000)
[  214.436373] 3ec0: 000000000000000b 00000000c02c564a 0000ffff82f56530 0000ffff83e9a910
[  214.444200] 3ee0: 0000000000000000 0000ffff84102350 0000000000000001 0000000000000040
[  214.452027] 3f00: 000000000000001d 0000ffff82f578e0 0000000000000000 0000000000000000
[  214.459855] 3f20: 0000ffff74004ce0 0000000000000000 000000000000001f 0000000000000000
[  214.467682] 3f40: 0000ffff8405d2c8 0000ffff83f36268 0000ffff83f22a70 0000000030badc00
[  214.475510] 3f60: 0000000056595559 0000000030bacdc0 0000ffff74001620 0000ffff740028f0
[  214.483337] 3f80: 0000ffff82f56530 0000ffff83c71000 0000000000000000 0000ffff83c58688
[  214.491165] 3fa0: 000000000000000b 0000ffff82f56460 0000ffff83c3916c 0000ffff82f56440
[  214.498992] 3fc0: 0000ffff83e9a91c 0000000080000000 000000000000000b 000000000000001d
[  214.506819] 3fe0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  214.514649] [<ffff000008083b18>] __sys_trace_return+0x0/0x4
[  214.520217] Code: 39747000 34000120 f9470023 52800000 (b9400463)
[  214.526308] ---[ end trace 7cc6a83e823274f0 ]---

Message from syslogd@imx8qmmek at Mon Jan 21 04:20:14 2019 ...
imx8qmmek kernel: [  214.164471] Internal error: Oops: 96000006 [#1] PREEMPT SMP

Message from syslogd@imx8qmmek at Mon Jan 21 04:20:14 2019 ...
imx8qmmek kernel: [  214.292490] Process v4l2src0:src (pid: 4029, stack limit = 0xffff00002b990000)

Message from syslogd@imx8qmmek at Mon Jan 21 04:20:14 2019 ...
imx8qmmek kernel: [  214.520217] Code: 39747000 34000120 f9470023 52800000 (b9400463)

^Chandling interrupt.
Interrupt: Stopping pipeline ...
Execution ended after 0:00:03.821538625
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
^C
root@imx8qmmek:~#
root@imx8qmmek:~#

Both below gstreamer commands I tried, but observation is above crash prints.

1) gst-launch-1.0 -e v4l2src device=/dev/video3 ! video/x-raw,width=1920,height=1080, framerate=60/1 ! waylandsink

2) gst-launch-1.0 v4l2src device=/dev/video3 ! videoconvert ! autovideosink

Is any additional plugins need to add in gstreamer commands?

Best Regards,

Prashanth Kumar K

[diegoadrian]

Hello,

To record video through the camera, you can use the below gstreamer pipeline:

gst-launch-1.0 v4l2src device=/dev/video0 ! 'video/x-raw,width=1280,height=720,framerate=30/1' ! filesink location=/tmp/test.raw.

Please make sure that you are connecting the camera on the correct MIPI port.

Best regards,

Diego