[Gst-launch-1.0] Using command line with 2 usb cameras

[yongdeukpark]

Dear all.

I am Yongdeuk Park.

I want to test Video recording with 2 usb webcams.

When I use 1 usb webcam, I got a good result with following command:

'gst-launch-1.0 -e imxv4l2src device=/dev/video0 ! videoconvert ! queue ! vpuenc_h264 ! video/x-h264 ! mp4mux ! filesink location=/tmp/test_1.mp4'

Actually, I want to get a result with 2 usb webcams.

Following is my test log.

# device: imx6qsbresd board

# root@imx6qsabresd:~# uname -a
Linux imx6qsabresd 3.14.52+g91d84b0 #1 SMP PREEMPT Fri Apr 20 16:21:33 KST 2018 armv7l GNU/Linux

I need you guys' help.

Thanks,

BR.

Yongdeuk Park

Test log

//CMD#1 : gst-launch-1.0 -e imxv4l2src device=/dev/video0 ! videoconvert ! queue ! vpuenc_h264 ! video/x-h264 ! mp4mux ! filesink location=/tmp/test_1.mp4 & //CMD#2 : gst-launch-1.0 -e imxv4l2src device=/dev/video3 ! videoconvert ! queue ! vpuenc_h264 ! video/x-h264 ! mp4mux ! filesink location=/tmp/test_2.mp4 & //CMD#1 result ====== IMXV4L2SRC: 4.0.8 build on Apr 23 2018 10:17:42. ====== Setting pipeline to PAUSED ... [INFO] Product Info: i.MX6Q/D/S ====== VPUENC: 4.0.8 build on Apr 23 2018 10:17:49. ====== wrapper: 1.0.62 (VPUWRAPPER_ARM_LINUX Build on Apr 23 2018 10:17:10) vpulib: 5.4.32 firmware: 3.1.1.46070 Pipeline is live and does not need PREROLL ... Setting pipeline to PLAYING ... New clock: GstSystemClock [INFO] ringBufferEnable 0, chromaInterleave 0, mapType 0, linear2TiledEnable 0 root@imx6qsabresd:/tmp# ps PID TTY TIME CMD 847 ttymxc0 00:00:00 sh 1984 ttymxc0 00:00:01 gst-launch-1.0 1996 ttymxc0 00:00:00 ps // then CMD#2 result ====== IMXV4L2SRC: 4.0.8 build on Apr 23 2018 10:17:42. ====== Setting pipeline to PAUSED ... [INFO] Product Info: i.MX6Q/D/S ====== VPUENC: 4.0.8 build on Apr 23 2018 10:17:49. ====== wrapper: 1.0.62 (VPUWRAPPER_ARM_LINUX Build on Apr 23 2018 10:17:10) vpulib: 5.4.32 firmware: 3.1.1.46070 Pipeline is live and does not need PREROLL ... Setting pipeline to PLAYING ... New clock: GstSystemClock uvcvideo: Failed to submit URB 0 (-28). uvcvideo: Failed to submit URB 0 (-28). ERROR: from element /GstPipeline:pipeline0/GstImxV4l2Src:imxv4l2src0: Internal data flow error. Additional debug info: /media/hd1/ydpark/fsl-release-bsl-quad/build-fb/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/gstreamer1.0/1.4.5-r0/gstreamer-1.4.5/libs/gst/base/gstbasesrc.c(2933): gst_base_src_loop (): /GstPipeline:pipeline0/GstImxV4l2Src:imxv4l2src0: streaming task paused, reason error (-5) EOS on shutdown enabled -- waiting for EOS after Error Waiting for EOS... root@imx6qsabresd:/tmp# ps PID TTY TIME CMD 847 ttymxc0 00:00:00 sh 1984 ttymxc0 00:00:04 gst-launch-1.0 1997 ttymxc0 00:00:00 gst-launch-1.0 2008 ttymxc0 00:00:00 ps // Final result root@imx6qsabresd:/tmp# ls -al total 888 drwxrwxrwt 2 root root 120 Jun 4 04:59 . drwxrwxrwt 4 root root 80 Jun 4 00:42 .. -rw-r--r-- 1 root root 0 Jun 4 00:42 .automount-mmcblk3p1 srwxrwxrwx 1 root root 0 Jun 4 00:42 oprofileui.socket -rw-r--r-- 1 root root 909312 Jun 4 04:59 test_1.mp4 -rw-r--r-- 1 root root 0 Jun 4 04:59 test_2.mp4

[igorpadykov]

Hi Yongdeuk

seems gstreamer-imx used in the case, its issues also may be posted on
Issues · Freescale/gstreamer-imx · GitHub 

Alternatively one can try with nxp plugins, usage is described in Linux Guide found

in nxp linux documentation on

https://www.nxp.com/support/developer-resources/run-time-software/i.mx-developer-resources/i.mx-6ser...

Best regards
igor
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[yongdeukpark]

Thanks for replying, Igor!

I did search for answer at Issues · Freescale/gstreamer-imx · GitHub . But I cannot find the solution.

Actually, a plugin name is different between my case and Github page. 

Can you explain more details to me?

I found that a boad what I used consists of 1 usb hub with 4 ports. 

In that case, Can I use only one gstreamer pipeline?

Thanks

BR

Yongdeuk Park