Setting exposure for Webcam doesn’t work with DeepStream 5.0

[Olivier Crête]

Hello,

This is specific to NVidia's proprietary elements, so you should
contact them about this.

Olivier

On Mon, 2021-02-01 at 22:16 -0600, Aswin wrote:
> Hi , 
> 
> I am building a G streamer pipeline for YOLO on Nvidia Jetson Nano.
> 
> This pipeline uses live feed captured through USB WEBCAM as input.
> 
> I need to operate the feed at a specific exposure setting.
> 
> I have changed the exposure settings as follows :
> 
> FROM :
> 
> *caps_v4l2src.set_property(‘caps’, Gst.Caps.from_string(“video/x-raw,
> framerate=30/1”))
> caps_vidconvsrc.set_property(‘caps’,
> Gst.Caps.from_string(“video/x-raw(memory:NVMM)”))
> *
> 
> TO :
> 
> *caps_v4l2src.set_property(‘caps’, Gst.Caps.from_string(“video/x-raw,
> framerate=(fraction)30/1, auto-exposure=(int)1,
> exposure-time=(double)166.66999999999999, width=(int)640,
> height=(int)480”))
> caps_vidconvsrc.set_property(‘caps’,
> Gst.Caps.from_string(“video/x-raw(memory:NVMM)”))*
> 
> I have verified this change in the pipeline in the following way :
> 
> *print(“Exposure Mode :”,
> caps.get_property(‘caps’).get_structure(0).get_value(‘auto-
> exposure’))
> print(“Exposure Time :”,
> caps.get_property(‘caps’).get_structure(0).get_value(‘exposure-
> time’))
> print(“Frame Width :”,
> caps.get_property(‘caps’).get_structure(0).get_value(‘width’))
> print(“Frame Height :”,
> caps.get_property(‘caps’).get_structure(0).get_value(‘height’))
> print(“Frame Rate :”,
> caps.get_property(‘caps’).get_structure(0).get_fraction(‘framerate’))
> *
> 
> This results as follows :
> 
> *Exposure Mode : 1
> Exposure Time : 166.67
> Frame Width : 640
> Frame Height : 480
> Frame Rate : (True, value_numerator=30, value_denominator=1)*
> 
> 
> The pipeline produces 29 FPS with lights turned on.
> 
> When the lights are turned off or camera is covered in such a way to
> block
> lights, FPS reduces to 15.
> 
> /This indicates that EXPOSURE change/setting has not happened in the
> gstreamer./
> 
> /But i am able to successfully set the exposure setting using opencv
> in
> python on the same camera./
> 
> Any possible guide on how to control the EXPOSURE, WIDTH, HEIGHT in
> the
> pipeline ?
> 
> 
> 
> --
> Sent from: http://gstreamer-devel.966125.n4.nabble.com/
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-- 
Olivier Crête
olivier.crete at collabora.com

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