Fix extract rgb frames bug when keeping original shape

[dreamerlin]

No description provided.

[codecov]

Codecov Report

Merging #187 into master will increase coverage by 0.10%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #187      +/-   ##
==========================================
+ Coverage   85.77%   85.87%   +0.10%     
==========================================
  Files          77       77              
  Lines        4849     4849              
  Branches      765      765              
==========================================
+ Hits         4159     4164       +5     
+ Misses        561      559       -2     
+ Partials      129      126       -3     

Flag	Coverage Δ
#unittests	85.87% <0.00%> (+0.10%)	⬆️

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Impacted Files	Coverage Δ
mmaction/models/backbones/resnet_tin.py	19.85% <0.00%> (ø)
mmaction/core/evaluation/accuracy.py	94.87% <0.00%> (+2.56%)	⬆️

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