# Error using V4l2 API's VIDIOC\_G\_CTRL **URL:** \ **Category:** Jetson Xavier NX\ **Tags:** camera, cuda\ **Created:** [November 9, 2023, 7:12am UTC](https://forums.developer.nvidia.com/t/error-using-v4l2-apis-vidioc-g-ctrl/272283 "2023-11-09T07:12:20Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![shree24](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@shree24](https://forums.developer.nvidia.com/u/shree24)\ **Post date:** [November 9, 2023, 7:12am UTC](https://forums.developer.nvidia.com/t/error-using-v4l2-apis-vidioc-g-ctrl/272283/1 "2023-11-09T07:12:20Z")
Hi Team, I have written v4l2 driver for AP1302. I am able to control V4l2 parameters with cmds. **v4l2-ctl -d /dev/v4l-subdev4 -L** → User Controls ``` brightness 0x00980900 (int) : min=0 max=65535 step=256 default=0 value=0 contrast 0x00980901 (int) : min=0 max=65535 step=256 default=0 value=0 saturation 0x00980902 (int) : min=0 max=65535 step=256 default=4096 value=4096 white_balance_mode 0x0098090c (menu) : min=0 max=1 default=1 value=1 0: Manual Temp Mode 1: Auto Mode gamma 0x00980910 (int) : min=0 max=65535 step=256 default=0 value=0 exposure 0x00980911 (int) : min=0 max=1000000 step=1 default=10000 value=10000 gain 0x00980913 (int) : min=0 max=65535 step=256 default=256 value=256 hflip 0x00980914 (bool) : default=0 value=0 vflip 0x00980915 (bool) : default=0 value=0 white_balance_temperature 0x0098091a (int) : min=2300 max=15000 step=1 default=5000 value=5000 sharpness 0x0098091b (int) : min=0 max=65535 step=256 default=0 value=0 backlight_compensation 0x0098091c (int) : min=0 max=65535 step=256 default=256 value=256 special_effect 0x0098091f (menu) : min=0 max=4 default=0 value=0 0: Normal Mode 1: Black and White Mode 2: Grayscale Mode 3: Negative Mode 4: Sketch Mode ``` Camera Controls ``` exposure_mode 0x009a0901 (menu) : min=0 max=1 default=1 value=1 0: Manual Mode 1: Auto Mode pan_target 0x009a0908 (int) : min=0 max=256 step=1 default=128 value=128 tilt_target 0x009a0909 (int) : min=0 max=256 step=1 default=128 value=128 zoom_target 0x009a090d (int) : min=256 max=2048 step=1 default=256 value=256 scene_mode 0x009a091a (menu) : min=0 max=13 default=0 value=0 0: None 1: Backlight 2: Beach/Snow 3: Candle Light 6: Fireworks 7: Landscape 8: Night 9: Party/Indoor 10: Portrait 11: Sports 12: Sunset 13: Text group_hold 0x009a2003 (bool) : default=0 value=0 flags=execute-on-write sensor_mode 0x009a2008 (int64) : min=0 max=4 step=1 default=0 value=0 flags=slider frame_rate 0x009a200b (int64) : min=2000000 max=30000000 step=1 default=30000000 value=2000000 flags=slider ``` I am able to change it cmd but with API it is giving me error 22. I am using sample API /usr/src/jetson\_multimedia\_api/samples/12\_v4l2\_camera\_cuda/camera\_v4l2\_cuda.cpp and added following function. static bool control\_v4l2(context\_t\*ctx) { struct v4l2\_ext\_controls ctrls; struct v4l2\_ext\_control ctrl; ctrls.ctrl\_class = V4L2\_CTRL\_ID2CLASS(V4L2\_CID\_GAIN); ctrls.count = 1; ctrls.controls = &ctrl; ``` memset(&ctrl, 0, sizeof(ctrl)); ctrl.id = V4L2_CID_GAIN; if (ioctl(ctx->cam_fd, VIDIOC_G_EXT_CTRLS, &ctrls) < 0) ERROR_RETURN("Failed to dequeue camera buff: %s (%d)", strerror(errno), errno); ``` return 1; } But after this I am getting **ERROR: control\_v4l2(): (line:576) Failed to dequeue camera buff: Invalid argument (22)** I have taken reference of topic [Failed to configure sensor\_mode by using v4l2 API](https://forums.developer.nvidia.com/t/failed-to-configure-sensor-mode-by-using-v4l2-api/141839) Thank you, ---
**Author:** ![MarkusHoHo](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/markushoho/32/233145_2.png) [@MarkusHoHo](https://forums.developer.nvidia.com/u/MarkusHoHo)\ **Post date:** [November 14, 2023, 12:19pm UTC](https://forums.developer.nvidia.com/t/error-using-v4l2-apis-vidioc-g-ctrl/272283/2 "2023-11-14T12:19:17Z")
Hi @shree24, sorry for the delay in answering. I think your question might better be suited for the Jetson categories in our forums. I hope you don’t mind me moving the post. Thanks! ---
**Author:** ![shree24](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@shree24](https://forums.developer.nvidia.com/u/shree24)\ **Post date:** [November 20, 2023, 4:16am UTC](https://forums.developer.nvidia.com/t/error-using-v4l2-apis-vidioc-g-ctrl/272283/3 "2023-11-20T04:16:02Z")
Hi @MarkusHoHo , I don’t mind if you move this post to another category but I didn’t get any reply even after a week. So what should I do according to you. Thank you ---
**Author:** ![shree24](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@shree24](https://forums.developer.nvidia.com/u/shree24)\ **Post date:** [November 27, 2023, 4:22am UTC](https://forums.developer.nvidia.com/t/error-using-v4l2-apis-vidioc-g-ctrl/272283/4 "2023-11-27T04:22:34Z")
Hey No reply from 2 weeks ---
**Author:** ![kayccc](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/kayccc/32/14043_2.png) [@kayccc](https://forums.developer.nvidia.com/u/kayccc)\ **Post date:** [December 6, 2023, 3:31am UTC](https://forums.developer.nvidia.com/t/error-using-v4l2-apis-vidioc-g-ctrl/272283/6 "2023-12-06T03:31:03Z")
Sorry for the late response. Is this still an issue to support? Any result can be shared? ---
**Author:** ![JerryChang](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/jerrychang/32/14043_2.png) [@JerryChang](https://forums.developer.nvidia.com/u/JerryChang)\ **Post date:** [December 6, 2023, 6:30am UTC](https://forums.developer.nvidia.com/t/error-using-v4l2-apis-vidioc-g-ctrl/272283/7 "2023-12-06T06:30:54Z")
please also examine your driver by [v4l2-compliance test](https://docs.nvidia.com/jetson/archives/r35.4.1/DeveloperGuide/text/SD/CameraDevelopment/SensorSoftwareDriverProgramming.html#to-run-a-v4l2-compliance-test). ---
**Author:** ![shree24](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@shree24](https://forums.developer.nvidia.com/u/shree24)\ **Post date:** [December 22, 2023, 6:46am UTC](https://forums.developer.nvidia.com/t/error-using-v4l2-apis-vidioc-g-ctrl/272283/9 "2023-12-22T06:46:27Z")
v4l2-compliance v4l2-compliance SHA: not available, 64 bits Compliance test for tegra-video device /dev/video0: Driver Info: Driver name : tegra-video Card type : vi-output, tevi-ap1302 12-003d Bus info : platform:tegra-capture-vi:0 Driver version : 5.10.120 Capabilities : 0x84200001 Video Capture Streaming Extended Pix Format Device Capabilities Device Caps : 0x04200001 Video Capture Streaming Extended Pix Format Media Driver Info: Driver name : tegra-camrtc-ca Model : NVIDIA Tegra Video Input Device Serial : Bus info : Media version : 5.10.120 Hardware revision: 0x00000003 (3) Driver version : 5.10.120 Interface Info: ID : 0x03000011 Type : V4L Video Entity Info: ID : 0x0000000f (15) Name : vi-output, tevi-ap1302 12-003d Function : V4L2 I/O Pad 0x01000010 : 0: Sink Link 0x02000015: from remote pad 0x100000c of entity ‘13e10000.host1x:nvcsi@15a00000-’: Data, Enabled Required ioctls: test MC information (see ‘Media Driver Info’ above): OK test VIDIOC\_QUERYCAP: OK Allow for multiple opens: test second /dev/video0 open: OK test VIDIOC\_QUERYCAP: OK test VIDIOC\_G/S\_PRIORITY: OK test for unlimited opens: OK Debug ioctls: test VIDIOC\_DBG\_G/S\_REGISTER: OK (Not Supported) test VIDIOC\_LOG\_STATUS: OK Input ioctls: test VIDIOC\_G/S\_TUNER/ENUM\_FREQ\_BANDS: OK (Not Supported) test VIDIOC\_G/S\_FREQUENCY: OK (Not Supported) test VIDIOC\_S\_HW\_FREQ\_SEEK: OK (Not Supported) test VIDIOC\_ENUMAUDIO: OK (Not Supported) test VIDIOC\_G/S/ENUMINPUT: OK test VIDIOC\_G/S\_AUDIO: OK (Not Supported) Inputs: 1 Audio Inputs: 0 Tuners: 0 Output ioctls: test VIDIOC\_G/S\_MODULATOR: OK (Not Supported) test VIDIOC\_G/S\_FREQUENCY: OK (Not Supported) test VIDIOC\_ENUMAUDOUT: OK (Not Supported) test VIDIOC\_G/S/ENUMOUTPUT: OK (Not Supported) test VIDIOC\_G/S\_AUDOUT: OK (Not Supported) Outputs: 0 Audio Outputs: 0 Modulators: 0 Input/Output configuration ioctls: test VIDIOC\_ENUM/G/S/QUERY\_STD: OK (Not Supported) test VIDIOC\_ENUM/G/S/QUERY\_DV\_TIMINGS: OK (Not Supported) test VIDIOC\_DV\_TIMINGS\_CAP: OK (Not Supported) test VIDIOC\_G/S\_EDID: OK (Not Supported) Control ioctls (Input 0): test VIDIOC\_QUERY\_EXT\_CTRL/QUERYMENU: OK test VIDIOC\_QUERYCTRL: OK test VIDIOC\_G/S\_CTRL: OK test VIDIOC\_G/S/TRY\_EXT\_CTRLS: OK test VIDIOC\_(UN)SUBSCRIBE\_EVENT/DQEVENT: OK test VIDIOC\_G/S\_JPEGCOMP: OK (Not Supported) Standard Controls: 1 Private Controls: 18 Format ioctls (Input 0): fail: v4l2-test-formats.cpp(280): duplicate format 59565955 (UYVY) test VIDIOC\_ENUM\_FMT/FRAMESIZES/FRAMEINTERVALS: FAIL fail: v4l2-test-formats.cpp(1280): ret && node-\>has\_frmintervals test VIDIOC\_G/S\_PARM: FAIL test VIDIOC\_G\_FBUF: OK (Not Supported) test VIDIOC\_G\_FMT: OK test VIDIOC\_TRY\_FMT: OK test VIDIOC\_S\_FMT: OK test VIDIOC\_G\_SLICED\_VBI\_CAP: OK (Not Supported) test Cropping: OK (Not Supported) test Composing: OK (Not Supported) test Scaling: OK (Not Supported) Codec ioctls (Input 0): test VIDIOC\_(TRY\_)ENCODER\_CMD: OK (Not Supported) test VIDIOC\_G\_ENC\_INDEX: OK (Not Supported) test VIDIOC\_(TRY\_)DECODER\_CMD: OK (Not Supported) Buffer ioctls (Input 0): fail: v4l2-test-buffers.cpp(715): q.create\_bufs(node, 1, &fmt) != EINVAL test VIDIOC\_REQBUFS/CREATE\_BUFS/QUERYBUF: FAIL test VIDIOC\_EXPBUF: OK test Requests: OK (Not Supported) Total for tegra-video device /dev/video0: 45, Succeeded: 42, Failed: 3, Warnings: 0 ---
**Author:** ![JerryChang](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/jerrychang/32/14043_2.png) [@JerryChang](https://forums.developer.nvidia.com/u/JerryChang)\ **Post date:** [December 25, 2023, 4:56am UTC](https://forums.developer.nvidia.com/t/error-using-v4l2-apis-vidioc-g-ctrl/272283/10 "2023-12-25T04:56:55Z")
> [@shree24](#): > > test VIDIOC\_G/S\_CTRL: OK > test VIDIOC\_G/S/TRY\_EXT\_CTRLS: OK hello shree24, it looks sanity test of these controls has passed. please examine your implementation, and.. may I know what’s the real use-case for sending gain controls. ---
**Author:** ![shree24](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@shree24](https://forums.developer.nvidia.com/u/shree24)\ **Post date:** [December 26, 2023, 5:03am UTC](https://forums.developer.nvidia.com/t/error-using-v4l2-apis-vidioc-g-ctrl/272283/11 "2023-12-26T05:03:26Z")
I just want to control all the v4l2 control parameters. I am able to set and get all the parameters from cmd line. When I am trying to use it from wrapper there it is not working. ---
**Author:** ![system](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/system/32/68080_2.png) [@system](https://forums.developer.nvidia.com/u/system)\ **Post date:** [January 9, 2024, 5:03am UTC](https://forums.developer.nvidia.com/t/error-using-v4l2-apis-vidioc-g-ctrl/272283/12 "2024-01-09T05:03:41Z")
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