gst-launch-1.0 v4l2src commands doesn't work

yibhan · ‎09-10-2020

Hi guys.

I am checking camera preview with gst-launch-1.0. I already checked camera preview with mxc_v4l2_overlay app embeded in rootfs. below is command used:

./mxc_v4l2_overlay.out -iw 720 -ih 576 -ow 640 -oh 480 -m 3 -di /dev/video0 fg

I have checked USB camera and it worked with below command:

gst-launch-1.0 v4l2src device=/dev/video2 ! 'video/x-raw, width=640,height=480' ! imxv4l2sink

but, when i use gst-launch-1.0 for previewing of camera, It doesn't work. below is command used:

1.gst-launch-1.0 v4l2src device=/dev/video0 ! 'video/x-raw, format=(string)UYVY,width=640,height=480,framerate=(fraction)30/1' ! autovideosink

2.gst-launch-1.0 v4l2src device=/dev/video0 ! autovideosink

Why that error happens? I want to know to fix that error for previewing of camera in application specially for opencv

* linux ver. 4.14.98-2.0.0

joanxie · ‎09-11-2020

what board are you talking about?

yibhan · ‎09-10-2020

For your information,

preview format is 720x625 PAL, progressive.

yibhan · ‎09-11-2020

Hi guys,

Thank you for answering.

I am using Imx6qp and board is custom board.

yibhan · ‎09-13-2020

Hi Joanxie,

Do you have any comment for my issue?

joanxie · ‎09-13-2020

since you use PAL camera, you should video/x-raw, format=(string)UYVY,width=720,height=576, I don't know what you mean doesn't work, pls share the logfile to check , maybe you can try like 'gst-launch-1.0 videotestsrc ! 'video/x-raw, format=(string)UYVY,width=720,height=576,framerate=25/1' ! imxvideoconvert_ipu ! 'video/x-raw, format=RGB16' ! mfw_v4lsink'

yibhan · ‎09-13-2020

Hi Joanxie,

1. below is logfile when i used "gst-launch-1.0 v4l2src device=/dev/video0 ! 'video/x-raw,width=720, height=756, framerate=25/1' ! videoconvert ! imxv4l2sink

: In MVC: mxc_v4l_ioctl 80045626

case VIDIOC_G_INPUT

Plpeline is live and does not neeIn MVC:mxc_v4l_ioctl PREROLL...

Setting pipeline tIn MVC: mxc_v4l_do_ioctl c0405602 PLAYING...

In MVC:mxc_v4l_ioctl

New clock: GstSystemClock

In MVC: mxc_v4l_do_ioctl c02c563a

case VIDIOC_CROPCAP

ERROR: from element /GstPipeline: In MVC: mxc_v4l_close

pipeline0/GstV4l2Src:v4l2src0: Inmxc_v4l_close: release resource

internal data stream erro.

Additi MVC: In mxc_free_frame_buffer

onal debug info:

../../../../gitIn MVC:mxc_free_frames

/libs/gst/base/gstbasesrc.c(3055): gst_base_src_loop (): /GstPipeline0/GstV4l2Src:v4l2src0:

streaming stopped, reason not-negotiated (-4)

2. below is command's logfile which you recommanded:

/# gst-launch-1.0 videotestsrc ! 'video/x-raw, format=(string)UYVY,width=720,height=576,framerate=25/1' ! imxvideoconvert_ipu ! 'video/x-raw, format=RGB16' ! mfw_v4lsink

WARNING: errorneous pipeline: no element "mfw_v4lsink"

joanxie · ‎09-13-2020

refer to the 4.14.98 user guide,

7.3.8 Camera preview
This example displays what the camera sees. It is only available on platforms with a camera.
$GSTL v4l2src ! 'video/x-raw, format=(string)$FORMAT,
width=$WIDTH, height=$HEIGHT, framerate=(fraction)30/1'
! v4l2sink
Camera preview example:
$GSTL v4l2src device=/dev/video1 ! 'video/x-raw,
format=(string)UYVY,width=640,height=480,framerate=(fraction)30/1'
! autovideosink
Parameter comments:

• Get the camera support format and resolution using gst-inspect-1.0 v4l2src.
• Set caps filter according to the camera's supported capabilities if the user needs other format or resolution.
• Ensure that the right caps filter has been set, which also needs to be supported by v4l2sink

joanxie · ‎09-13-2020

try to change "mfw_v4lsink" to "imxv4l2sink" in the second command

yibhan · ‎09-13-2020

Hi Joanxie,

gst-launch-1.0 v4l2src device=/dev/video0 ! 'video/x-raw,width=720, height=756, framerate=25/1' ! videoconvert ! imxv4l2sink

-> I added "format=(string) UYVY" in above command but, didn't work

joanxie · ‎09-13-2020

this command works for you ?

"./mxc_v4l2_overlay.out -iw 720 -ih 576 -ow 640 -oh 480 -m 3 -di /dev/video0 fg"

yibhan · ‎09-13-2020

Hi Joanxie,

1. "./mxc_v4l2_overlay.out -iw 720 -ih 576 -ow 640 -oh 480 -m 3 -di /dev/video0 fg"

-> Yes, It works,

2. "gst-launch-1.0 videotestsrc ! 'video/x-raw, format=(string)UYVY, width=720,height=576,framerate=25/1, interlace-mode=(string)progressive' ! imxv4l2sink"

the above command works, but when change src from videotessrc to v4l2src, it doesn't work.

And, I have checked below command:

3. "gst-device-monitor-1.0" and results are:

(gst-device-monitor-1.0:645): GIn MVC:mxc_v4l_ioctl

Streamer-CRITICAL **: In MVC: mxc_v4l_do_ioctl c02c563a

gst_element_message_full_with_details: assertion 'GST_IS_ELEMENT(element)' failed

In MVC:mxc_v4l_close

mxc_v4l_close: release resource

MVC: In mxc_free_frame_buf

Invalid crop param: crop.w0, crop.h=0

mxc_v4l2_output v4l2_out: filed format:4 not supported yet!

Invalid crop param: crop.w0, crop.h=0

mxc_v4l2_output v4l2_out: filed format:4 not supported yet!

......

yibhan · ‎09-15-2020

Hi Joanxie,

Do you have any comment for my issue? I still have no idea to solve this issue.

yibhan · ‎09-16-2020

Hi Joanxie,

I should use gst-launch for camera application, but it still doesn't work.

Can you reproduce my issue on your side?

Do you have any solution to avoid this issue ?

joanxie · ‎09-18-2020

I only have ov5640 camera, I don't have PAL camera to test for you, I tested on my imx6qp board, I can successfully use the command without any error message

yibhan · ‎09-18-2020

Hi Joanxie,

Thank for your answering. Could you give me favor?

Please let me know "v4l2-ctl --all -d 0" in your side.

My "v4l2-ctl --all -d 0" is :

================================

Video input: 0 (CSI IC MEM: ok)

Video output: 0 (DISP3 BG)

Video Standard = 0x000000ff

PAL-B/B1/G/H/I/D/D1/K

Format Video Capture:

Width/Height : 288/352

Pixel Format : 'Yu12"

Field : Any

Bytes per Line : 432

------------------------------------

Format Video Overlay:

Left/Top : 0/0

Width/Height : 160/160

-------------------------------------

Framebuffer Format:

capability : Extern Overlay

Flags : Overlay Matches Capture/Output Size

Width : 0

Height : 0

----------------------------------

Crop Capability Video Capture :

Bounds : Left 0, Top 0, Width 720, Height 625

Default : Left 0, Top 0, Width 720, Height 625

---------------------

joanxie · ‎09-20-2020

this is mine:

Driver Info:
Driver name : mxc_v4l2
Card type :
Bus info :
Driver version : 0.1.11
Capabilities : 0x05000005
Video Capture
Video Overlay
Read/Write
Streaming
Video input : 0 (CSI IC MEM: ok)
Video output: 0 (DISP3 BG)
Video Standard = 0x00000000

Format Video Capture:
Width/Height : 288/352
Pixel Format : 'YU12'
Field : Any
Bytes per Line : 432
Size Image : 152064
Colorspace : Default
Transfer Function : Default (maps to Rec. 709)
YCbCr/HSV Encoding: Default (maps to ITU-R 601)
Quantization : Default (maps to Limited Range)
Format Video Overlay:
Left/Top : 0/0
Width/Height: 160/160
Field : Any
Chroma Key : 0x00000000
Global Alpha: 0x00
Clip Count : 0
Clip Bitmap : No
Framebuffer Format:
Capability : Extern Overlay
Flags : Overlay Matches Capture/Output Size
Width : 0
Height : 0
Pixel Format : ''
Crop Capability Video Capture:
Bounds : Left 0, Top 0, Width 640, Height 480
Default : Left 0, Top 0, Width 640, Height 480
Pixel Aspect: 0/0
Crop: Left 0, Top 0, Width 640, Height 480
Streaming Parameters Video Capture:
Capabilities : timeperframe
Frames per second: 30.000 (30/1)
Read buffers : 0

yibhan · ‎09-27-2020

Hi Joanxie,

Thank you for answering.

Could you please whole command you have tried on captured screen? I couldn't get whole command you did.

The whole command might be cropped.

joanxie · ‎10-22-2020

the whole command I use is as your demands, you need the result of using "v4l2-ctl --all -d 0"