ZED SDK 4.0.8 C++ disableRecording() Not Working?

Software
1

Hi,

Seems the ZED SDK version 4.0.8 disableRecording() function is not working?

for example:

this->zed.disableRecording(); 
this_rec_status = this->zed.getRecordingStatus();
std::cout << "is_recording status: " << this_rec_status.is_recording << std::endl;
std::cout << "is_paused status: " << this_rec_status.is_paused << std::endl;

will print

is_recording status: true
is_paused status: false

Zed can be closed with close() function, but the auto exposure etc will change and cause overexposure when start a new recording in daylight. I’m trying to record the SVO every 5 minutes.

Thanks!

2

Hi @TonyF
thank you for reporting the problem.

I could replicate the issue and the bug has been noted to be solved in one of the next releases of the SDK.

I also verified that the SVO recording is effectively stopped, only the status is not updated.

3

Thanks for the help!

Btw, is there a way that when open the ZED, it won’t overexposure for the first 30 seconds with auto exposure settings and in outdoor daylight?

Thanks!

4

This is a behavior that we could not replicate.
Have you tried to force the disable and re-enable of the AEC_AGC control to trigger a quick exposure processing?

5

Correction on previous question: the auto exposure adjustment take about 10 seconds, not 30 seconds.

The work flow is as this:

// open zed with init parameters
auto returned_state = zed.open(init_parameters);
...
// Setup ZED recording parameters.
recordingParameters.video_filename = sl::String(filename_svo.c_str());
auto err = zed.enableRecording(recordingParameters);
...
// grab frames
auto state = zed.grab(runtime_parameters);
...
zed.disableRecording();
zed.close()

We are recording SVO files on 5 minutes chunks. If we open and close the zed for each 5 minutes (repeat the above code), each svo file shows from over-exposure to normal in about 10 seconds at the beginning. I just tried the following with AEC_AGC:

// open zed with init parameters
auto returned_state = zed.open(init_parameters);
zed.setCameraSettings(sl::VIDEO_SETTINGS::AEC_AGC, 0);
zed.setCameraSettings(sl::VIDEO_SETTINGS::AEC_AGC, 1);
...

the results are about the same. Here are the screen grabs:
Beginning of SVO file:

Screenshot from 2024-01-18 13-02-16
Screenshot from 2024-01-18 13-02-162324×1351 96.3 KB

Then about 10 seconds when the auto exposure settles (I can only put one embedded picture, but the exposure gradually becomes correct within ~ 10 seconds)

So I’m think these possible solutions:

  1. keep the zed open (unless need to change the init parameters), and enable and disable recordings only. (possible long term stability? say for 2-3 days stay open, and enable and disable recording every 5 minutes.)
  2. get the current video settings before the zed close, and apply the same video settings, then switch to auto AEC_AGC after 20 seconds.
  3. My code is wrong and the auto exposure adjust should be very quick? (i.e. no over-exposure at the beginning of the SVO file.)

Thanks!

6

Before re-enabling the AEC_AGC control, I recommend setting a good value for exposure/gain and waiting for 5-10 frames to allow the ISP to set the new value.