I would like to know first frame skip of video

Autonomous Machines Jetson & Embedded Systems Jetson TX1
1

If the gstreamer simultaneously captures four channels simultaneously, the start frame image may be filled with zeros.
I tried to fix it at the driver level to solve this problem, but I could not do it because it was too complicated.
I did skip-to-first configuration of videorate plugin and tested and it had no effect.
I would like to know if there is a way to omit the first frame of the video using gstreamer.
Or I want to know if there is another solution.
IMG_8420.MOV (109 KB)

2

Hi walterkim
You can try have a frame delay after the _S_stream() in the sensor driver.

3

for example under code . is it right?

static int ov5693_s_stream(struct v4l2_subdev *sd, int enable)
{
:
:
delay(10);
return 0;

}

4

Yes, correct place and you may need more than 1 frame time. If the frame rate is 30fps then it must big than 33 ms

5

s_stream() delay is no effect.

/**

  • struct v4l2_subdev_sensor_ops - v4l2-subdev sensor operations
  • @g_skip_top_lines: number of lines at the top of the image to be skipped.
  •        This is needed for some sensors, which always corrupt

  •        several top lines of the output image, or which send their

  •        metadata in them.
  • @g_skip_frames: number of frames to skip at stream start. This is needed for
  •     buggy sensors that generate faulty frames when they are

  •     turned on.

*/
struct v4l2_subdev_sensor_ops {
int (*g_skip_top_lines)(struct v4l2_subdev *sd, u32 *lines);
int (*g_skip_frames)(struct v4l2_subdev *sd, u32 *frames);
};

do you know that?

6

Hi wallterkim
If delay take no effect that could be the sensor initial table missing a good value of frame_lenght/coarse_time/gain. Please have a try to set a safe value of those reg in the initial table.

7

Hi walterkim,

Have you clarified where might be the cause and issue got fix?
Any result can be shared?

Thanks

8

pending issue…

i will made gstreamer plugin for frame skip.

um…