Fix the issue of extract_frames_as_images destory input frame

[1192119703jzx]

fixes #302

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.63%. Comparing base (2e17432) to head (c94106c).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #303      +/-   ##
===========================================
+ Coverage    90.74%   92.63%   +1.88%     
===========================================
  Files           10       10              
  Lines         1383     1384       +1     
===========================================
+ Hits          1255     1282      +27     
+ Misses         128      102      -26     

Flag	Coverage Δ
unittests	92.63% <100.00%> (+1.88%)	⬆️

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[keighrim]

@1192119703jzx could you also some sanity checks (and maybe some edge case handling?) to the test suite, around here

mmif-python/tests/test_utils.py

Lines 107 to 108 in 0e6dbbb

?