SCF report error "FM_STATS data size wrong: 0 != 8192"

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

We use 2 different process to acquire images from 2 cameras, and every single process working correctly.
But if two processes running at the same time, the second process will report an error:

	FM_STATS data size wrong: 0 != 8192
	SCF: Error InvalidSize:  (propagating from src/services/autocontrol/isp_stats/IspLegacyStatsDecoder.cpp, function decodeIspStats(), line 58)
	SCF: Error InvalidSize: There was an error decoding stats for frame 1, frame stats will be invalid (in src/services/autocontrol/isp_stats/IspLegacyStatsDecoder.cpp, function decodeIspStats(), line 66)
	totalCount of histogram is zero
	[I] 1517874534.224 | 1894.445 frame in, camera=1, number=1, timestamp=1517874534.204ms, exposure=1.000ms, lux=1000.00
	AWB: M3Stats VWindows = 0 != 64
3

Could you attached you code and binary. Also what’s the version?

4

argus_camera_single (2.1 MB)
Hi, ShaneCCC:

Test binary uploaded. Running method:

# console 1
./argus_camera_single -d 0
# console 2
./argus_camera_single -d 1

Thanks.

5

What’s the different with reference APP argus_camera?

6

Hi, ShaneCCC:

We will check the difference with the argus_camera.
Thanks.

7

Yes, there’s no problem to run two sensor in two sessions with argus_camera.

8

Yes, argus_camera works.

9

Hi, ShaneCCC:

We have test using argus_camera.
If argus_camera using EGL_DEFAULT_DISPLAY, then two argus_camera application instances can’t run at the same time.

Please apply attached patch, and check it.

Thanks.

argus_camera_patch_use_default_display.patch (861 Bytes)

10

I don’t know if this modification is correct or not. But can you tell why do this modification?

11

Our application doesn’t have GUI, so we using EGL_DEFAULT_DISPLAY.

Thanks.

12

By the way, we’re using stereo cameras.
First we tried one-session, multiple cameras mode. but it have some problems:
1. For one session/multiple cameras, if one camera failed, can other cameras work normally?
2. For one session/multiple cameras, why SensorTimestamp is early than exposure start time?

So we want to try multiple process mode…

Thanks.

13

What’s the error message?

14
  • libnvargus print following errors in second application, and first camera application also halt.
FM_STATS data size wrong: 0 != 8192
SCF: Error InvalidSize:  (propagating from src/services/autocontrol/isp_stats/IspLegacyStatsDecoder.cpp, function decodeIspStats(), line 58)
SCF: Error InvalidSize: There was an error decoding stats for frame 1, frame stats will be invalid (in src/services/autocontrol/isp_stats/IspLegacyStatsDecoder.cpp, function decodeIspStats(), line 66)
Segmentation fault

Thanks.

screesnap
screesnap1798×2740 1.6 MB

15

I try the yuvjpeg sample code without display the UI without problem by below command.

./argus_yuvjpeg -o 0 -d 0 & ./argus_yuvjpeg -o 0 -d 1

16

yuvJpeg.patch (1.4 KB)
Hi, ShaneCCC:
Please apply attached patch to disable JPG output, the error appear again.

  • And more informations: There are 2 types of failures:
    • case 1: application 2 can’t start and report an error "FM_STATS data size wrong: 0 != 8192”
    • case 2: application 2 can start, but the frame rate of both cameras will drop to 1/2.
      • For example, if origin frame is 20fps, will drop to 10fps.

Please help.

Thanks.

17

Any update?

Thanks

18

Can reproduce the FM_STATS after remove the JPG, run about 10 times
How to check the framerate from this APP?

19

If using argus_camera_single

  • Every frame timestamp is printed. Framerate is calculated by:

image
image764×134 5.62 KB

Thanks.