How can I view the record file which only including the trafficlight info

[qiongwu1003]

System information

• OS Platform and Distribution (e.g., Linux Ubuntu 18.04):18.04
• Apollo installed from (source or binary):source
• Apollo version (3.5, 5.0, 5.5, 6.0):5.0
• Output of apollo.sh config if on master branch:

Steps to reproduce the issue:

• Running Apollo5.0 and LGSVL simulator 202006
• Using "cyber_recorder record -o data/bag/xxxx.record -c /apollo/perception/traffic_light" get the traffic lights information

I only want to know the traffic lights detection result per frame. And the cyber_monitor can not show it. What I want to know is if
there are other ways to view the xxxx.record file?

Supporting materials (screenshots, command lines, code/script snippets):

[daohu527]

You can follow the "modules/tools/record_parse_save" to export the data. You need to create a new script to export apollo::perception::TrafficLightDetection

[qiongwu1003]

@daohu527 thank your reply. According to your method I got the traffic light info.
In addition, I have three more questions. Looking forward to your answer.

1. Dose the cyber recorder records the message frame by frame?
   After investigation, I know that apollo uses camera pictures to detect traffic lights(Am I right?). So I try to check the traffic light detection result by the image info. But I found that the message numbers are different between traffic light and camera.

2. In the traffic light channel, I found "timestamp_sec" and "camera_timestamp", I think that the "camera_timestamp" correspond to the "timestamp_sec" in the camera channel.

But when parse the camera info, it uses the "measurement_time" in the script code. Otherwise, the accuracy of "timestamp_sec" and "measurement_time" are not the same. What is the "measurement_time"?

What I want to know is that how can I pick the right camera picture?

3. I found that the 4 traffic lights result are all the same in the record file.

But the detection results are not the same when running the detection. Is it correct?

[daohu527]

Closed due to inactivity. If the problem persists, pls feel free to reopen it or create a new one and refer to it.