Convert log files to a human-readable format - a JSON stream.
Use go-get to install this executable:
go get -u github.com/RoboCup-SSL/ssl-go-tools/cmd/ssl-log-converter
The binary is called ssl-log-converter.
Run it with -h to print usage information.
The output will be written to <input-file>.txt.
You can convert detection or geometry messages to a text file containing one message per line, encoded as JSON.
Afterwards, you can use common Unix CLI tools and jq:
# Extract detection frames
ssl-log-converter -extractDetection my-logfile.log
# Select two fields, convert them to CSV and write them to a file
jq -r '[.camera_id, .t_capture] | @csv' my-logfile.log > data.csv