next attempt at debugging

.github/workflows/continuous-integration.yml

@@ -64,6 +64,7 @@ jobs:
       - name: Test with pytest
         env: 
           PYTHONIOENCODING: utf-8
+          PYTHONUNBUFFERED: "1"
         run: |
           cd Pose2Sim/Utilities
           conda run -n pose2sim pytest -v tests.py --capture=sys

Pose2Sim/calibration.py

@@ -14,8 +14,6 @@ Or calibrates cameras from checkerboard images.
 
 Checkerboard calibration is based on 
 https://docs.opencv.org/3.4.15/dc/dbb/tutorial_py_calibration.html.
-/!\ Beware that corners must be detected on all frames, or else extrinsic 
-parameters may be wrong. Set show_corner_detection to 1 to verify.
 
 INPUTS: 
 - a calibration file in the 'calibration' folder (.qca.txt extension)